P2035 Exhaust Gas Temperature (EGT) Sensor Circuit Low (Bank 2 Sensor 2)

P2035 Exhaust Gas Temperature (EGT) Sensor Circuit Low (Bank 2 Sensor 2) is a generic OBD-II diagnostic trouble code indicating that the vehicle's control module has detected an abnormally low electrical signal from the exhaust gas temperature (EGT) sensor circuit on Bank 2 Sensor 2.

The Exhaust Gas Temperature (EGT) sensor measures the temperature of exhaust gases and sends an electrical signal to the engine control module (ECM), powertrain control module (PCM), or aftertreatment control module.

In simple terms, the vehicle's computer is receiving a lower-than-expected electrical signal from the EGT sensor associated with Bank 2 Sensor 2.

An important point is that "Circuit Low" primarily describes the electrical signal, not necessarily a genuinely low exhaust temperature.

P2035 can therefore be caused by:

• A faulty EGT sensor

• A short circuit to ground

• Damaged wiring

• Corroded connector

• Incorrect sensor resistance

• Reference-voltage problems

• Signal-circuit problems

• Connector terminal problems

• Sensor contamination

• Incorrect sensor installation

• A genuinely low exhaust temperature condition

• Problems with fuel, turbocharger, DPF, or aftertreatment operation

Proper diagnosis is necessary to determine whether the problem is electrical, sensor-related, or caused by an actual exhaust-temperature condition.

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What Does P2035 Mean?

The code description contains several important terms.

Exhaust Gas Temperature (EGT) Sensor

An EGT sensor measures exhaust gas temperature.

The control module uses EGT information to monitor and control systems such as:

• Catalytic converters

• Diesel particulate filters (DPF)

• Selective Catalytic Reduction (SCR) systems

• Turbochargers

• Exhaust components

• Emissions-control systems

Depending on the vehicle, EGT information can be used for:

• DPF regeneration

• Catalyst temperature monitoring

• Thermal protection

• SCR operation

• Exhaust temperature control

• Emissions-system diagnostics

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Circuit Low

The term "Circuit Low" means the control module has detected an electrical signal that is lower than the expected range.

It does not automatically mean that the exhaust itself is too cold.

For example, an EGT sensor circuit that is shorted to ground may produce an abnormally low signal.

Possible electrical causes include:

• Signal wire shorted to ground

• Damaged wiring

• Incorrect sensor resistance

• Sensor internal failure

• Connector problems

• Reference-voltage problems

• Poor terminal contact

The exact electrical behavior depends on the type of EGT sensor and circuit used by the manufacturer.

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Bank 2

Bank 2 refers to the cylinder bank that does not contain cylinder number one.

On a V-type engine:

• Bank 1 = cylinder 1 side

• Bank 2 = opposite side

Inline engines normally have only one bank, so Bank 2 is generally associated with V-type or other multi-bank engine configurations.

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Sensor 2

Sensor 2 identifies the EGT sensor position within the vehicle's exhaust-temperature monitoring system.

It is important not to assume that Sensor 2 always means immediately after the catalytic converter.

The exact location can vary depending on:

• Engine design

• Exhaust layout

• DPF location

• SCR system

• Turbocharger configuration

• Manufacturer

• Model

• Engine version

On some vehicles, Bank 2 Sensor 2 may be positioned downstream of a catalyst or DPF, while another vehicle may use a different exhaust-temperature sensor arrangement.

The exact location should therefore be confirmed using the vehicle-specific wiring diagram and service information.

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How Does an EGT Sensor Work?

EGT sensors can use different technologies depending on the vehicle.

Many systems use thermistor-type sensors, while others use thermocouple-based designs.

With a thermistor-type sensor, electrical resistance changes as temperature changes.

A simplified relationship is:

Exhaust temperature changes → Sensor resistance changes → Electrical signal changes → Control module calculates temperature

P2035 occurs when the control module determines that the sensor circuit signal is lower than expected.

The exact voltage and resistance values depend on the sensor design.

A low electrical signal can result from either:

1. An actual sensor/circuit problem, or

2. A genuine exhaust-temperature condition that causes the sensor to produce a lower signal.

This distinction is critical during diagnosis.

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Why Is EGT Temperature Important?

The exhaust temperature affects the operation and protection of several engine and emissions components.

The control module needs accurate EGT information to prevent excessive heat and to ensure that emissions systems reach their required operating temperatures.

For example, diesel DPF regeneration requires sufficiently high exhaust temperatures to burn accumulated soot.

If the EGT sensor incorrectly reports a low temperature, the control module may incorrectly determine that the exhaust system has not reached the required temperature.

This can affect:

• DPF regeneration

• Catalyst operation

• SCR monitoring

• Emissions control

• Thermal protection

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Symptoms of P2035

Symptoms depend on the vehicle and the underlying cause.

Check Engine Light

The Check Engine Light is the most common symptom.

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DPF Warning

On diesel vehicles, P2035 may be accompanied by a DPF warning if the incorrect EGT signal interferes with regeneration.

Possible warnings include:

• DPF warning

• Exhaust filter warning

• Regeneration required

• Particulate filter full

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DEF/AdBlue or SCR Warning

If the vehicle's aftertreatment system relies on EGT information, it may also display:

• DEF system fault

• AdBlue system fault

• SCR system fault

• Emissions system fault

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DPF Regeneration Problems

An incorrect low EGT signal can cause the control module to believe that the exhaust is not hot enough for regeneration.

Possible results include:

• Regeneration not starting

• Regeneration being delayed

• Regeneration being interrupted

• More frequent regeneration attempts

• Increasing soot accumulation

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Reduced Engine Power

Some vehicles may activate a reduced-power or emissions-related operating strategy if the fault remains unresolved.

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Poor Fuel Economy

Repeated or unsuccessful regeneration attempts can increase fuel consumption.

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Increased Emissions

Incorrect exhaust-temperature information can interfere with emissions-system operation and potentially increase emissions.

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Poor Engine Performance

Depending on the vehicle, symptoms may include:

• Reduced acceleration

• Hesitation

• Uneven operation

• Reduced turbocharger performance

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No Noticeable Driving Symptoms

P2035 can also occur without obvious drivability problems.

The vehicle may drive normally while the Check Engine Light remains illuminated.

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Common Causes of P2035

Faulty EGT Sensor

A failing EGT sensor is one of the most common causes.

An internal sensor failure can cause the output signal to become lower than expected.

Possible failures include:

• Internal short

• Incorrect resistance

• Sensor degradation

• Internal electronic failure

• Incorrect temperature response

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Short Circuit to Ground

A short between the EGT signal circuit and ground can pull the signal lower than expected.

Possible causes include:

• Melted insulation

• Chafed wiring

• Pinched wires

• Incorrect previous repairs

• Wiring touching the exhaust or chassis

This is an important possibility when the EGT temperature reading is unrealistically low.

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Damaged EGT Wiring

EGT sensor wiring operates in a harsh environment.

Possible damage includes:

• Burned insulation

• Melted wiring

• Broken conductors

• Heat-hardening

• Chafing

• Corrosion

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Corroded Connector

Moisture, dirt, and exhaust heat can damage the sensor connector.

Possible problems include:

• Corroded terminals

• Loose pins

• Bent terminals

• Moisture intrusion

• Damaged seals

• Poor terminal tension

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Incorrect Sensor Resistance

Thermistor-type EGT sensors must have a specific resistance-temperature relationship.

If the resistance is incorrect, the control module may calculate an implausible temperature.

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Reference-Voltage Problem

Depending on the circuit design, an incorrect reference or supply voltage can affect the sensor signal.

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Open or Damaged Circuit

An open circuit can produce an invalid sensor reading depending on the sensor design and the control module's monitoring strategy.

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Sensor Contamination

An EGT sensor may become contaminated by:

• Soot

• Oil

• Coolant

• Fuel deposits

Contamination can affect sensor response and accuracy.

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Incorrect Sensor Installation

A replacement sensor with the wrong electrical characteristics can create a low-signal fault even if the sensor is new.

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Genuine Low Exhaust Temperature

P2035 can sometimes occur because the exhaust temperature is actually lower than expected.

Possible causes include:

• Excessively low engine load

• Fuel-system problems

• Incorrect fuel injection

• Thermostat or engine-temperature problems

• Turbocharger issues

• DPF regeneration failure

• Exhaust-system problems

However, because P2035 specifically identifies a circuit low condition, the electrical circuit should be checked before assuming that the exhaust temperature is genuinely low.

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DPF Regeneration Problems

If the vehicle cannot achieve the required regeneration temperature, the EGT sensor may report temperatures that remain below expected thresholds.

Possible causes include:

• Excessive soot loading

• Regeneration system faults

• Incorrect fuel injection

• DPF problems

• Exhaust leaks

• Incorrect temperature feedback

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Exhaust Leak

An exhaust leak can allow outside air to enter the exhaust system and affect measured exhaust temperature.

This may be particularly relevant if the sensor is located near an exhaust connection or leak.

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Exhaust System Modifications

Aftermarket exhaust components or modifications can change:

• Exhaust flow

• Heat distribution

• Sensor exposure

• Sensor location

• Wiring routing

These changes may contribute to EGT-related faults.

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Control Module Problem

In rare cases, the ECM, PCM, or aftertreatment control module may incorrectly interpret the EGT signal.

This should generally be investigated only after the sensor and wiring have been tested.

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Vehicles Commonly Affected by P2035

P2035 can occur on vehicles equipped with multiple exhaust gas temperature sensors.

Examples may include:

• Ford F-250 Super Duty Diesel

• Ford F-350 Super Duty Diesel

• Ford Transit Diesel

• Chevrolet Silverado Duramax

• GMC Sierra Duramax

• Ram 2500 Diesel

• Ram 3500 Diesel

• Mercedes-Benz Sprinter Diesel

• Volkswagen Touareg TDI

• Audi Q7 TDI

• BMW X5 Diesel

• BMW X6 Diesel

• Porsche Cayenne Diesel

• Jeep Grand Cherokee Diesel

• Volkswagen Transporter

• Peugeot Boxer Diesel

• Citroën Jumper Diesel

• Fiat Ducato Diesel

• Iveco Daily

• Renault Master

This list is not exhaustive.

The exact EGT sensor configuration varies between manufacturers, engines, model years, and emissions systems.

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How Is P2035 Diagnosed?

The most important diagnostic question is:

Is the EGT sensor circuit actually producing a low electrical signal, or is the exhaust temperature genuinely lower than expected?

Because P2035 is a circuit low code, electrical testing should be performed before replacing the sensor.

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Step 1: Scan for Additional Trouble Codes

Use a suitable diagnostic scan tool to retrieve:

• Stored codes

• Pending codes

• Manufacturer-specific codes

• Freeze-frame data

Pay attention to related faults involving:

• Other EGT sensors

• DPF

• SCR

• NOx sensors

• Fuel injectors

• Fuel pressure

• Turbocharger

• Exhaust leaks

• Regeneration

• Aftertreatment communication

Additional codes may identify the underlying problem.

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Step 2: Review Freeze-Frame Data

Check the conditions under which P2035 was stored.

Useful information includes:

• Engine RPM

• Vehicle speed

• Engine coolant temperature

• Intake-air temperature

• EGT readings

• Engine load

• DPF soot load

• Regeneration status

• Battery voltage

This helps determine whether the code appeared during normal driving, cold operation, or an active regeneration event.

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Step 3: Check the EGT Temperature PID

Monitor the Bank 2 Sensor 2 EGT reading with a scan tool.

Compare the reading with:

• Other EGT sensors

• Engine temperature

• Ambient conditions

• Engine load

• Manufacturer specifications

An implausibly low reading is an important clue.

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Step 4: Check the EGT Reading With a Cold Engine

A cold engine provides a useful reference.

If the EGT Sensor 2 reading is significantly lower than physically plausible or behaves abnormally immediately after startup, investigate the sensor circuit.

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Step 5: Inspect the EGT Sensor

Check the sensor for:

• Physical damage

• Soot deposits

• Oil contamination

• Coolant contamination

• Corrosion

• Incorrect installation

• Damaged sensor tip

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Step 6: Inspect the Wiring Harness

Follow the EGT Sensor 2 wiring from the sensor toward the control module.

Look for:

• Melted insulation

• Burned wires

• Chafing

• Broken conductors

• Exposed wires

• Pinched harness

• Previous repairs

• Loose retaining clips

Pay particular attention to areas close to hot exhaust components.

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Step 7: Inspect the Connector

Check the connector for:

• Corrosion

• Moisture

• Loose terminals

• Bent pins

• Damaged seals

• Heat damage

• Poor terminal tension

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Step 8: Check the Sensor Circuit Voltage

Using the vehicle-specific wiring diagram and manufacturer test procedure, measure the relevant circuit voltage.

Determine whether the low signal is caused by:

• The sensor

• A short to ground

• Wiring damage

• Reference-voltage problems

• Connector problems

• Control-module circuitry

Generic voltage values should not be substituted for manufacturer specifications.

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Step 9: Check Sensor Resistance

If the vehicle uses a resistance-based EGT sensor, measure the sensor resistance according to the manufacturer's specifications.

Compare the measured resistance with the expected resistance for the sensor's actual temperature.

An incorrect resistance value can indicate a faulty sensor.

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Step 10: Check for a Short to Ground

Test the sensor signal circuit for an unwanted connection to ground.

A short to ground can pull the signal lower than expected and directly cause a circuit-low condition.

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Step 11: Check for an Open Circuit

Inspect the circuit for:

• Broken wires

• Disconnected connectors

• Loose terminals

• Failed splices

• Damaged conductors

An open circuit can cause an invalid EGT reading depending on the sensor design.

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Step 12: Perform a Wiggle Test

Monitor the EGT signal while carefully moving the sensor harness and connector.

If the signal changes unexpectedly, inspect the wiring and terminals more closely.

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Step 13: Compare Bank 2 Sensor 2 With Other EGT Sensors

If the vehicle has several EGT sensors, compare their readings under similar operating conditions.

If other EGT sensors show plausible values while Bank 2 Sensor 2 reports an abnormally low temperature, the affected sensor or circuit becomes a strong suspect.

Sensor locations can have different normal temperatures, so comparison should be made with manufacturer specifications.

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Step 14: Check for Genuine Low Exhaust Temperature

If the electrical circuit is correct, investigate whether the exhaust temperature is actually too low.

Possible causes include:

• Engine operating at very low load

• Fuel-injection problems

• DPF regeneration failure

• Turbocharger problems

• Exhaust leaks

• Engine-temperature problems

• Aftertreatment faults

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Step 15: Check DPF Regeneration

On diesel vehicles, determine whether P2035 occurs during:

• Attempted regeneration

• Failed regeneration

• Interrupted regeneration

• Excessive regeneration attempts

If regeneration cannot produce the required exhaust temperature, the underlying cause should be diagnosed.

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Step 16: Inspect the DPF and Exhaust System

Check for:

• Excessive soot accumulation

• DPF restriction

• Catalyst problems

• Exhaust leaks

• Damaged exhaust components

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Step 17: Check Fuel Injection

Incorrect fuel delivery can affect exhaust temperature.

Inspect:

• Fuel injectors

• Fuel pressure

• Injection timing

• Fuel trims where applicable

• Misfire data

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Step 18: Check Turbocharger Operation

Turbocharger problems can alter exhaust temperature and exhaust flow.

Check:

• Boost pressure

• Turbocharger control

• Wastegate operation

• Variable-geometry mechanism

• Charge-air leaks

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Step 19: Check Manufacturer Technical Information

Look for:

• Technical Service Bulletins

• Known EGT sensor failures

• Wiring harness issues

• Connector updates

• Sensor revisions

• DPF regeneration procedures

• Software updates

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Step 20: Check the Control Module

If the EGT sensor, wiring, connector, and actual exhaust conditions are all verified, investigate the ECM, PCM, or aftertreatment control module.

Control-module replacement should only be considered after the external circuit has been thoroughly tested.

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How to Fix P2035

The correct repair depends on the reason for the low EGT sensor circuit signal.

Replace the Faulty EGT Sensor

If testing confirms that Bank 2 Sensor 2 is defective, replace it with the correct sensor for the vehicle.

Do not assume that all EGT sensors on the same vehicle are interchangeable.

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Repair a Short to Ground

Locate and repair any unintended connection between the EGT signal circuit and ground.

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Repair Damaged Wiring

Repair or replace wiring damaged by:

• Exhaust heat

• Chafing

• Vibration

• Corrosion

• Road debris

• Previous improper repairs

Secure the harness away from excessive heat.

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Repair or Replace the Connector

If the connector has:

• Corrosion

• Loose terminals

• Bent pins

• Damaged seals

• Poor terminal tension

• Heat damage

repair or replace it as required.

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Repair the Reference Circuit

If the sensor does not receive the required reference or supply voltage, repair the relevant circuit.

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Correct Sensor Installation

If an incorrect EGT sensor was installed, replace it with the correct vehicle-specific component.

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Address Genuine Low Exhaust Temperature

If the EGT sensor and electrical circuit are functioning correctly but the exhaust temperature is genuinely too low, the underlying engine or emissions problem must be diagnosed.

Potential causes include:

• Fuel-system problems

• Injection problems

• DPF regeneration faults

• Exhaust leaks

• Turbocharger problems

• Engine operating-temperature problems

Replacing the EGT sensor will not correct a genuine temperature problem.

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Repair DPF Regeneration Problems

If the DPF cannot reach the required regeneration temperature, diagnose the regeneration system and its related components.

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Repair Exhaust Leaks or Restrictions

Repair exhaust leaks or restrictions that are affecting exhaust temperature and aftertreatment operation.

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Repair Fuel-System Problems

Correct injector, fuel-pressure, injection-timing, or combustion problems that are affecting exhaust temperature.

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Repair Turbocharger Problems

If turbocharger operation is contributing to an abnormal exhaust-temperature condition, repair the boost or turbocharger-control system.

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Update Control Module Software

If the manufacturer has released a software update related to EGT monitoring or aftertreatment operation, reprogram the applicable control module.

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Replace the Control Module

If a confirmed internal control-module fault is found after the sensor and circuit have been tested, the relevant control module may need to be replaced and programmed.

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Perform Required Calibration or Initialization

After replacing an EGT sensor or related emissions component, the vehicle may require:

• EGT sensor calibration

• DPF service reset

• Regeneration procedure

• Aftertreatment initialization

• SCR system test

• Module programming

The exact procedure depends on the vehicle.

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Clear the Code and Verify the Repair

After completing the repair:

1. Clear P2035.

2. Start the engine from a cold condition when possible.

3. Monitor Bank 2 Sensor 2 EGT data.

4. Compare the reading with other EGT sensors.

5. Verify the sensor circuit.

6. Check sensor resistance or signal characteristics as applicable.

7. Verify that the signal changes as exhaust temperature changes.

8. Check DPF regeneration status where applicable.

9. Test-drive the vehicle.

10. Rescan for stored and pending codes.

The repair should be considered successful only when the EGT signal behaves normally and P2035 does not return.

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What Happens If P2035 Is Ignored?

If the EGT sensor continues to report a low or invalid signal, the control module may incorrectly determine that the exhaust system is not reaching the required operating temperature.

Possible consequences include:

• DPF regeneration problems

• Delayed regeneration

• Interrupted regeneration

• Increased soot accumulation

• DPF warning

• Increased fuel consumption

• Increased emissions

• Reduced SCR efficiency

• Additional emissions-system codes

• Reduced engine power

• DEF/AdBlue warnings on some vehicles

If the exhaust temperature is genuinely too low, the vehicle may be unable to perform certain emissions-control functions correctly.

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Can You Drive With P2035?

Short-term driving may be possible if the vehicle operates normally, but P2035 should be diagnosed promptly.

If the problem is limited to a faulty EGT sensor or wiring issue, the vehicle may continue to drive without immediate drivability problems.

However, continued operation can become more problematic if the fault interferes with DPF regeneration or other emissions-system functions.

Pay particular attention to:

• DPF warning

• Check Engine Light

• DEF/AdBlue warning

• Reduced engine power

• Regeneration problems

• Emissions-system countdowns

If several of these symptoms appear together, the vehicle should be inspected as soon as possible.

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Is P2035 a Serious Code?

P2035 is generally considered a moderate-severity emissions-system fault.

A simple sensor or wiring problem does not necessarily indicate immediate engine damage.

However, an incorrect EGT signal can interfere with DPF regeneration and exhaust aftertreatment operation.

The severity increases if P2035 is accompanied by:

• DPF restriction

• Failed regeneration

• High soot loading

• Fuel-system faults

• Turbocharger faults

• SCR faults

• Reduced-power warnings

• DEF/AdBlue countdown

A persistent fault should therefore be diagnosed rather than repeatedly cleared.

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P2035 vs. P2036 and P2037

These codes are close together in the diagnostic code sequence but refer to different conditions.

Code	General Meaning
P2035	Exhaust Gas Temperature Sensor Circuit Low – Bank 2 Sensor 2
P2036	Exhaust Gas Temperature Sensor Circuit High – Bank 2 Sensor 2
P2037	Reductant Injection Air Pressure Sensor "A" Circuit Malfunction

The distinction is important.

P2035 indicates a low electrical signal from the EGT sensor.

P2036 indicates a high electrical signal from the same general EGT sensor position.

P2037 concerns a different component: the reductant injection air pressure sensor.

Therefore:

P2035 → EGT circuit low

P2036 → EGT circuit high

P2037 → Reductant injection air pressure sensor circuit malfunction

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P2035 vs. P2086 and P2087

P2035 should also be distinguished from later codes involving Bank 2 Sensor 2.

Code	General Meaning
P2035	EGT Sensor Circuit Low – Bank 2 Sensor 2
P2086	EGT Sensor Circuit Range / Performance – Bank 2 Sensor 2
P2087	EGT Sensor Circuit Intermittent – Bank 2 Sensor 2

This means that several codes can refer to the same general sensor position while describing different electrical conditions.

P2035 → Low signal

P2086 → Range/performance problem

P2087 → Intermittent circuit problem

The code should therefore be diagnosed according to its exact description rather than simply replacing the EGT sensor.

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P2035 vs. P2034

If applicable to the vehicle's diagnostic strategy, nearby EGT codes can refer to different sensor positions.

The sensor number and bank should always be read together.

Bank 2 Sensor 2 is not necessarily interchangeable with:

• Bank 1 Sensor 2

• Bank 2 Sensor 1

• Other EGT sensors

The exact sensor location should be confirmed with the vehicle's service documentation.

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How to Prevent P2035

Not every EGT sensor failure can be prevented, but proper maintenance can reduce the risk of sensor, wiring, and aftertreatment problems.

Recommended practices include:

• Inspect EGT sensor wiring during routine servicing.

• Keep sensor wiring away from excessive exhaust heat.

• Secure wiring harnesses correctly.

• Repair melted or damaged insulation promptly.

• Inspect connectors for corrosion and moisture.

• Address exhaust leaks quickly.

• Maintain the DPF according to manufacturer recommendations.

• Avoid ignoring DPF regeneration warnings.

• Address fuel-injection problems promptly.

• Repair engine misfires as soon as possible.

• Maintain the turbocharger and boost-control system.

• Avoid unnecessary exhaust modifications.

• Use the correct replacement EGT sensor.

• Address Check Engine Light and emissions warnings promptly.

• Inspect EGT wiring after exhaust or underbody repairs.

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Final Thoughts

P2035 Exhaust Gas Temperature (EGT) Sensor Circuit Low (Bank 2 Sensor 2) indicates that the vehicle's control module has detected an abnormally low electrical signal in the EGT sensor circuit associated with Bank 2 Sensor 2.

The most important point is that "Circuit Low" does not automatically mean the exhaust temperature itself is low.

Possible causes include:

• Faulty EGT sensor

• Signal circuit short to ground

• Damaged wiring

• Corroded connector

• Loose terminals

• Incorrect sensor resistance

• Reference-voltage problems

• Open or damaged circuit

• Sensor contamination

• Incorrect sensor installation

• Genuine low exhaust temperature

• DPF regeneration problems

• Exhaust leaks

• Fuel-system problems

• Turbocharger problems

• Aftertreatment faults

• Control-module problems

The correct diagnostic approach is to first determine whether the electrical signal is artificially low or whether the exhaust temperature is genuinely lower than expected.

If the sensor reports an implausibly low temperature immediately after a cold start, the sensor, signal circuit, connector, or wiring should be investigated.

If the electrical circuit is correct and the EGT reading accurately reflects a genuinely low exhaust temperature, the technician should investigate DPF regeneration, fuel injection, engine operating temperature, turbocharger operation, exhaust leaks, and other related systems.

The EGT sensor should not automatically be replaced simply because P2035 is stored.

A proper diagnosis should include checking the live EGT reading, sensor circuit, wiring, connector, resistance or signal characteristics, and actual exhaust operating conditions.

Once the underlying problem has been repaired, P2035 should be cleared and the vehicle tested under the operating conditions that originally triggered the fault.

A successful repair should restore a plausible and stable EGT signal from Bank 2 Sensor 2, allow the emissions system to operate normally, and prevent P2035 from returning.