P2060 Reductant Injection Air Pump Control Circuit Low

P2060 Reductant Injection Air Pump Control Circuit Low is a generic OBD-II diagnostic trouble code indicating that the Engine Control Module (ECM), Powertrain Control Module (PCM), or aftertreatment control module has detected an abnormally low electrical signal in the circuit controlling the reductant injection air pump.

In simple terms, the vehicle's computer has determined that the voltage or electrical response in the reductant injection air pump control circuit is lower than expected.

This system is used on certain diesel emissions-control systems to help deliver reductant into the exhaust. On vehicles equipped with an air-assisted reductant injection system, an air pump supplies compressed air to help atomize the reductant before it enters the exhaust stream.

In many diesel applications, the reductant is Diesel Exhaust Fluid (DEF), known as AdBlue in many European markets.

Possible causes of P2060 include:

• Short to ground

• Low supply voltage

• Faulty reductant injection air pump

• Shorted pump motor

• Damaged wiring

• Corroded connector

• Poor electrical connection

• Faulty relay

• Poor ground

• Air-pump control circuit failure

• Failed aftertreatment control module driver

• Incorrect replacement component

• Software or calibration problem

P2060 does not automatically mean that the reductant air pump is defective. The wiring, power supply, ground, relay, and control signal should be tested before replacing the pump.

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What Does P2060 Mean?

The code description can be divided into four important parts.

Reductant

Reductant is a fluid used by certain emissions-control systems to reduce harmful exhaust pollutants.

On many modern diesel vehicles, the reductant is DEF/AdBlue.

DEF is injected into the exhaust and works with the Selective Catalytic Reduction (SCR) system to reduce nitrogen oxide (NOx) emissions.

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Injection

Injection refers to the controlled introduction of reductant into the exhaust system.

The control module determines when and how much reductant should be injected based on factors such as:

• Engine load

• Exhaust temperature

• Engine speed

• NOx levels

• SCR operating conditions

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Air Pump

The reductant injection air pump supplies compressed air to an air-assisted dosing system.

The compressed air helps break the reductant into small droplets, improving atomization and mixing with the exhaust gases.

Not every SCR system uses an air-assisted pump. Therefore, P2060 applies only to vehicles whose emissions system contains the relevant circuit.

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Control Circuit

The control circuit is the electrical path used to control the reductant injection air pump.

Depending on the vehicle, the circuit can include:

• Battery power

• Ground

• Fuse

• Relay

• Control wire

• Pump motor

• Driver transistor

• Feedback circuit

• Aftertreatment control module

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Low

"Low" means that the control module detects an electrical voltage or signal below the expected range.

Common electrical causes include:

• Short to ground

• Low battery voltage

• Poor ground

• High-resistance connection

• Shorted pump

• Damaged control wire

• Control-module driver problem

The exact circuit behavior depends on the manufacturer's electrical design.

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How Does a Reductant Injection Air Pump Work?

A typical air-assisted reductant injection system operates as follows:

1. DEF/AdBlue is stored in a dedicated tank.

2. The control system monitors the reductant level and temperature.

3. A reductant supply system moves fluid toward the dosing system.

4. The air pump is activated when air assistance is required.

5. The pump produces compressed air.

6. Compressed air travels through an air line to the dosing injector.

7. Reductant is combined with the air at the injector.

8. The air helps atomize the reductant.

9. The injector sprays the reductant into the exhaust.

10. The SCR catalyst uses the resulting ammonia-containing compounds to reduce NOx.

11. NOx sensors monitor emissions performance.

12. The control module adjusts dosing as necessary.

If the air-pump control circuit remains below its expected voltage, P2060 can be stored.

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Why Is Air Assistance Used?

Air assistance can improve reductant atomization.

The compressed air breaks the liquid into smaller droplets, which can improve:

• Spray quality

• Exhaust mixing

• Reductant distribution

• SCR catalyst utilization

• Dosing consistency

The exact design differs among manufacturers.

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Symptoms of P2060

Check Engine Light

The Check Engine Light is a common symptom.

The control module may illuminate the warning lamp after detecting the circuit-low condition.

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DEF/AdBlue Warning

Vehicles equipped with SCR may display a reductant or emissions warning.

Possible messages include:

• Check DEF

• AdBlue system fault

• DEF system malfunction

• Exhaust fluid system fault

• Reductant system fault

The exact wording depends on the manufacturer.

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Reduced Engine Power

Some vehicles may reduce engine torque when a reductant-system fault prevents normal emissions control.

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Vehicle Speed Limitation

Certain SCR-equipped vehicles may eventually impose speed restrictions if the emissions fault remains unresolved.

The exact strategy is manufacturer-specific.

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Increased NOx Emissions

If reductant injection is compromised, the SCR catalyst may not reduce NOx as effectively.

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Reductant Dosing Problems

The air pump may not be able to provide the correct air assistance, resulting in poor reductant atomization or incorrect dosing.

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Poor Engine Performance

Depending on the vehicle's fail-safe strategy, symptoms can include:

• Reduced acceleration

• Hesitation

• Torque limitation

• Reduced engine power

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Additional Aftertreatment Fault Codes

P2060 may appear alongside codes involving:

• DEF system

• Reductant pressure

• Dosing injector

• NOx sensors

• SCR efficiency

• Aftertreatment communication

These additional codes can help identify the root cause.

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No Noticeable Symptoms

P2060 can sometimes be stored without obvious drivability symptoms.

The vehicle may continue to drive normally while the emissions system monitors the fault.

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Common Causes of P2060

Short to Ground

A short to ground is one of the most important causes of a circuit-low code.

If the pump control wire contacts ground, circuit voltage may be pulled below the expected level.

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Low Battery or Charging Voltage

A weak battery or charging-system problem can reduce available voltage.

Check:

• Battery voltage

• Alternator output

• Charging voltage

• Battery terminals

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Faulty Reductant Injection Air Pump

The pump motor can develop an internal electrical fault.

Possible failures include:

• Shorted motor windings

• Internal electrical failure

• Seized motor

• Excessive current draw

• Internal wiring problems

A shorted pump can pull the circuit voltage down and trigger P2060.

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Damaged Wiring

The harness can be damaged by:

• Exhaust heat

• Vibration

• Road debris

• Water

• Dirt

• Salt

• Abrasion

A damaged wire may short against the engine, chassis, or another circuit.

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Corroded Connector

Moisture and contamination can cause connector corrosion.

Check for:

• Green corrosion

• White deposits

• Moisture

• Loose pins

• Bent terminals

• Damaged seals

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Poor Electrical Connection

A loose or corroded terminal can create resistance and cause a voltage drop.

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Faulty Relay

A defective relay may prevent the pump from receiving the correct power.

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Poor Ground

A weak ground connection can interfere with pump operation and create abnormal voltage readings.

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Failed Air-Pump Control Circuit

The circuit driver may be unable to provide the required voltage or current to the pump.

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Failed Aftertreatment Control Module Driver

The ECM, PCM, or aftertreatment module may use an electronic driver to control the pump.

A failed driver can cause an incorrect low signal.

The control module should not be condemned until the wiring and pump have been tested.

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Incorrect Replacement Component

A replacement pump with different electrical characteristics can cause a circuit fault.

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Incorrect Wiring Repair

A previous repair may have:

• Reversed wires

• Created a short to ground

• Added excessive resistance

• Connected the wrong circuit

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Exhaust Heat Damage

The reductant air-pump harness may run near hot exhaust components.

Melted insulation can allow the circuit to short to ground.

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Software or Calibration Problem

In rare cases, incorrect module software or calibration can contribute to a false or recurring fault.

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Contaminated DEF/AdBlue

Contaminated or incorrect DEF can cause SCR problems.

However, DEF contamination by itself does not normally cause an electrical circuit-low code.

P2060 should first be approached as an electrical fault.

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Frozen DEF

DEF can freeze in cold conditions.

Modern systems generally have measures for thawing and temperature management, but extreme cold or a defective heating system can interfere with operation.

A frozen reductant tank does not automatically indicate an electrical fault in the air-pump circuit.

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Vehicles Commonly Affected by P2060

P2060 can occur on diesel vehicles equipped with an air-assisted reductant injection system.

Examples may include:

• Ford F-250 Super Duty

• Ford F-350 Super Duty

• Ford F-450 Super Duty

• Ford Transit Diesel

• Chevrolet Silverado Duramax

• Chevrolet Express Diesel

• GMC Sierra Duramax

• GMC Savana Diesel

• Ram 2500

• Ram 3500

• Mercedes-Benz Sprinter

• Volkswagen Touareg TDI

• Volkswagen Transporter

• Audi Q7 TDI

• BMW X5 Diesel

• Peugeot Boxer Diesel

• Citroën Jumper

• Fiat Ducato Diesel

• Iveco Daily

• Renault Master

• Opel Movano

This list is not exhaustive.

P2060 is a generic OBD-II code, and the exact air-pump configuration varies by manufacturer.

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How Is P2060 Diagnosed?

P2060 should be diagnosed as an electrical circuit-low fault.

The objective is to determine whether the low voltage is caused by the pump, wiring, power supply, ground, relay, or control module.

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Step 1: Scan for Additional Trouble Codes

Use a suitable diagnostic scan tool to retrieve all stored and pending codes.

Look for codes involving:

• Reductant injection

• DEF/AdBlue

• Air pump

• Reductant pump

• Dosing injector

• NOx sensors

• SCR efficiency

• Aftertreatment module

• Power supply

• Ground

• Communication

Multiple related codes can provide an important diagnostic clue.

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Step 2: Check Freeze-Frame Data

Record the operating conditions when P2060 was stored.

Useful information may include:

• Engine RPM

• Vehicle speed

• Battery voltage

• Engine temperature

• Exhaust temperature

• DEF temperature

• Pump command

• Dosing command

• Aftertreatment status

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Step 3: Identify the Exact Circuit

Use the manufacturer's wiring diagram to identify:

• Air-pump power terminal

• Ground terminal

• Control terminal

• Fuse

• Relay

• Controlling module

• Feedback circuit, if equipped

Do not assume every vehicle uses the same circuit arrangement.

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Step 4: Inspect the Air Pump

Check the pump for:

• Physical damage

• Corrosion

• Water intrusion

• Connector damage

• Overheating

• Seized motor

• Damaged air connections

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Step 5: Inspect Wiring and Connectors

Follow the harness from the pump toward the control module.

Look for:

• Chafed wires

• Melted insulation

• Broken wires

• Shorted wires

• Corrosion

• Loose terminals

• Water intrusion

• Incorrect previous repairs

Pay particular attention to sections routed close to the exhaust.

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Step 6: Check Battery Voltage

Verify that the vehicle's battery and charging system provide the required voltage.

Low system voltage can affect pump operation.

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Step 7: Check Pump Power Supply

Verify power at the air pump.

Check:

• Fuse

• Relay

• Power wire

• Connector

• Terminal condition

If power is missing, trace the circuit back toward the fuse and relay.

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Step 8: Check Pump Ground

Verify the pump's ground connection.

A voltage-drop test under load is more useful than simply checking continuity.

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Step 9: Test for a Short to Ground

With the circuit isolated according to the manufacturer's procedure, test the control wire for an unwanted connection to ground.

A shorted control wire can pull the circuit voltage low.

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Step 10: Monitor the Control Signal

Use a suitable diagnostic tool or oscilloscope to monitor the pump control circuit.

Depending on the system, the pump may be controlled using:

• Switched voltage

• Ground-side switching

• PWM control

• Electronic communication

Compare the observed signal with manufacturer specifications.

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Step 11: Perform an Active Test

If supported, command the reductant injection air pump using the diagnostic tool.

Monitor:

• Pump operation

• Circuit voltage

• Current draw

• Air pressure

• Control signal

• Feedback

If the voltage drops excessively when the pump is commanded, the pump may be internally shorted or drawing excessive current.

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Step 12: Test Pump Resistance

If the manufacturer specifies a resistance test, disconnect the pump and measure resistance across the correct terminals.

An abnormal resistance reading can indicate:

• Shorted windings

• Open windings

• Internal electrical failure

Do not use a generic resistance value because pump specifications vary.

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Step 13: Check Fuse and Relay Operation

Test the applicable fuse and relay.

Verify that the relay:

• Receives its control signal

• Switches correctly

• Provides the correct output

• Does not have excessive contact resistance

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Step 14: Perform Voltage-Drop Tests

Check voltage drop across:

• Power wiring

• Ground wiring

• Relay contacts

• Connectors

This can identify high-resistance connections that a basic continuity test may miss.

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Step 15: Inspect Air Lines

Although P2060 is an electrical code, inspect the pneumatic side while testing the pump.

Check for:

• Cracked hoses

• Loose fittings

• Blockages

• Air leaks

• Damaged connections

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Step 16: Inspect the Reductant Injector

If additional dosing faults are present, inspect the injector for:

• Crystallized DEF

• Blockage

• Electrical faults

• Poor atomization

• Damaged wiring

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Step 17: Check the Control Module

If the pump, wiring, power, ground, and relay all test correctly, check the ECM/PCM or aftertreatment module's output driver.

Do not replace the control module simply because P2060 is present.

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Step 18: Check Manufacturer Technical Information

Check for:

• Technical Service Bulletins

• Known pump failures

• Wiring harness problems

• Relay problems

• Dosing-system faults

• Software updates

• Updated components

• Calibration procedures

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How to Fix P2060

The correct repair depends on the cause of the low circuit signal.

Repair a Short to Ground

Locate the shorted control wire and repair or replace the damaged wiring.

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Repair Damaged Wiring

Replace or repair:

• Chafed wires

• Melted insulation

• Broken conductors

• Corroded wiring

• Incorrect previous repairs

Restore proper heat protection and harness routing.

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Repair or Replace Connectors

Replace damaged terminals or connectors.

Ensure proper terminal tension and connector sealing.

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Replace a Faulty Fuse

If a fuse is blown, replace it with the correct rating after determining why it failed.

Do not install a higher-rated fuse.

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Replace a Faulty Relay

If the relay does not supply power correctly, replace it with the correct specification.

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Repair the Ground Circuit

Repair loose, corroded, or high-resistance ground connections.

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Replace the Reductant Injection Air Pump

If the pump fails its electrical or functional tests, replace the appropriate pump.

The replacement must match the manufacturer's specifications.

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Repair the Air-Pump Control Circuit

If the control signal is not being generated correctly, repair the associated circuit after confirming that the pump and wiring are not responsible.

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Repair the Control Module

If the output driver is proven defective, repair or replace the applicable module according to manufacturer procedures.

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Update Control Module Software

If a software update addresses P2060, reprogram the relevant module.

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Repair Air Lines

If pneumatic hoses or fittings are damaged, repair or replace them.

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Clean or Replace the Reductant Injector

If the injector is blocked with DEF crystallization or otherwise defective, clean or replace it according to manufacturer procedures.

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Perform Required Calibration

After replacing an air pump, injector, or control module, the vehicle may require:

• Reductant system initialization

• Air-pump calibration

• Dosing-system calibration

• DEF system reset

• Aftertreatment module programming

• System self-test

The exact procedure is vehicle-specific.

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Clear the Code and Verify the Repair

After completing the repair:

1. Clear P2060.

2. Run the applicable aftertreatment self-test.

3. Command the air pump if supported.

4. Monitor circuit voltage.

5. Check current draw.

6. Verify air pressure.

7. Confirm reductant injection.

8. Test-drive the vehicle.

9. Rescan for stored and pending codes.

The repair should be considered successful only when the circuit operates within specification and P2060 does not return.

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What Happens If P2060 Is Ignored?

If P2060 prevents the reductant injection air pump from operating correctly, the system may not be able to atomize reductant as designed.

Possible consequences include:

• Check Engine Light

• DEF/AdBlue warning

• Increased NOx emissions

• Reduced SCR effectiveness

• Reductant dosing problems

• Reduced engine power

• Vehicle speed limitation

• Additional aftertreatment fault codes

On some vehicles, continued operation with an unresolved SCR fault can eventually result in operating restrictions or restart limitations.

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Can You Drive With P2060?

Short-term driving may be possible if the vehicle operates normally, but P2060 should be diagnosed promptly.

If a DEF/AdBlue warning, emissions countdown, or reduced-power message appears, the vehicle should be serviced without unnecessary delay.

Continued driving can potentially result in:

• Reduced engine power

• Speed restrictions

• SCR system faults

• Increased NOx emissions

• Additional aftertreatment problems

If severe power loss or multiple emissions warnings are present, the vehicle should be inspected as soon as possible.

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Is P2060 a Serious Code?

P2060 is generally considered a moderate-to-high severity emissions-system fault.

The immediate problem is an abnormally low electrical signal in the reductant injection air pump control circuit.

Although the vehicle may initially continue to operate normally, failure of the air-pump circuit can compromise reductant injection and SCR operation.

Potential consequences include:

• Increased NOx emissions

• Reduced SCR effectiveness

• DEF/AdBlue warnings

• Reduced engine power

• Vehicle speed restrictions

• Additional emissions-system faults

The actual severity depends on the vehicle's aftertreatment design and fail-safe strategy.

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P2060 vs. P2061

P2060 and P2061 describe opposite electrical conditions in the reductant injection air pump control circuit.

Code	General Meaning
P2060	Reductant Injection Air Pump Control Circuit Low
P2061	Reductant Injection Air Pump Control Circuit High

P2060 — Circuit Low

The control module detects a voltage or electrical signal below the expected range.

Common diagnostic possibilities include:

• Short to ground

• Low supply voltage

• Poor ground

• High-resistance connection

• Shorted air pump

• Damaged wiring

P2061 — Circuit High

The control module detects a voltage or electrical condition above the expected range.

Common possibilities include:

• Short to battery voltage

• Open control circuit with a pull-up voltage

• Faulty relay

• Incorrect wiring

• Failed pump

• Control-module driver problem

The two codes can involve the same pump but require different electrical tests.

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P2060 vs. P2062 and P2063

These codes belong to related reductant and regeneration circuit groups but do not describe exactly the same fault.

Code	General Meaning
P2060	Reductant Injection Air Pump Control Circuit Low
P2061	Reductant Injection Air Pump Control Circuit High
P2062	Reductant / Regeneration Supply Control Circuit Open
P2063	Reductant / Regeneration Supply Control Circuit Low

P2060 and P2061 specifically identify the reductant injection air pump control circuit.

P2062 and P2063 refer more generally to a reductant/regeneration supply control circuit.

The exact component assignments remain dependent on the vehicle manufacturer's system design.

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How to Prevent P2060

Not every electrical failure can be prevented, but proper maintenance can reduce the risk of related reductant-system problems.

Recommended practices include:

• Use the correct DEF/AdBlue specification.

• Keep reductant-system connectors clean and properly sealed.

• Repair damaged wiring promptly.

• Keep wiring harnesses away from excessive exhaust heat.

• Maintain the battery and charging system.

• Avoid unnecessary modifications to aftertreatment wiring.

• Address DEF/AdBlue warnings promptly.

• Keep reductant air hoses and fittings in good condition.

• Address DEF crystallization around the injector when necessary.

• Use the correct replacement air pump.

• Follow manufacturer procedures after aftertreatment repairs.

• Maintain the vehicle according to manufacturer recommendations.

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Final Thoughts

P2060 Reductant Injection Air Pump Control Circuit Low indicates that the vehicle's control system has detected an abnormally low electrical signal in the circuit controlling the reductant injection air pump.

The most important causes include:

• Short to ground

• Low system voltage

• Poor ground

• High-resistance connection

• Damaged wiring

• Corroded connector

• Faulty relay

• Shorted reductant injection air pump

• Air-pump control circuit failure

• Failed aftertreatment control-module driver

• Incorrect wiring repair

• Incorrect replacement component

• Software or calibration problems

The key diagnostic point is that P2060 does not automatically mean the reductant air pump needs to be replaced.

Because this is a circuit-low fault, diagnosis should begin with the electrical system. The technician should identify the exact circuit, inspect the wiring and connectors, verify battery voltage, test the fuse and relay, check power and ground, test for a short to ground, and monitor the pump control signal.

If the circuit voltage drops excessively when the pump is commanded, the pump may have an internal electrical fault or excessive current draw. If the pump tests correctly, attention should shift toward the wiring, relay, power supply, ground, or control-module driver.

If P2060 affects an SCR/DEF system, ignoring the problem can eventually lead to increased NOx emissions, reductant dosing problems, reduced SCR effectiveness, reduced engine power, vehicle speed limitations, and additional aftertreatment faults.

The correct repair is to identify the source of the low circuit signal, repair the wiring or electrical supply or replace the failed component, perform any required initialization or calibration, clear the code, and verify that the reductant injection air pump operates correctly without P2060 returning.