P2260 Secondary Air Injection System Control "B" Circuit High

P2260 is a generic OBD-II diagnostic trouble code that indicates the Engine Control Module (ECM) has detected a high voltage condition in the Secondary Air Injection (SAI) System Control "B" Circuit.

In simple terms, the ECM is receiving a voltage signal from the Secondary Air Injection System Control "B" circuit that is higher than the manufacturer's specified operating range. This abnormal signal prevents the ECM from properly controlling the secondary air injection system, which is designed to reduce exhaust emissions during cold engine starts.

The Secondary Air Injection (SAI) system injects fresh air into the exhaust stream immediately after the engine starts. This additional oxygen helps burn unburned fuel inside the exhaust system, allowing the catalytic converter to reach operating temperature more quickly and reducing harmful emissions.

When the ECM detects an excessively high voltage in the control circuit, it stores diagnostic trouble code P2260 and usually illuminates the Check Engine Light.

What Does P2260 Mean?

The Secondary Air Injection System is an emissions control system installed on many gasoline-powered vehicles.

Its primary purpose is to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions during cold starts.

The system typically includes:

• Secondary air injection pump

• Air injection control valve

• Air switching valve

• Vacuum solenoid (on some vehicles)

• Electrical relay

• Wiring harness

• Engine Control Module (ECM)

The ECM controls the system by activating the air pump and opening the appropriate valves during specific operating conditions.

The code description contains several important meanings:

Secondary Air Injection System

An emissions control system that injects fresh air into the exhaust system.

Control "B"

The manufacturer identifies this as the "B" control circuit, which may refer to a specific valve, relay, or secondary control circuit depending on the vehicle design.

Circuit

The circuit includes:

• Power supply

• Ground circuit

• Signal wire

• Connectors

• ECM communication

High

The ECM has detected a voltage that is higher than the expected operating range.

Possible causes include:

• Short to battery voltage

• Faulty control solenoid

• Open ground circuit

• Damaged wiring

• Internal ECM fault

Symptoms of P2260

The symptoms of P2260 are often limited to emissions-related issues, although drivability problems may occur on some vehicles.

Common symptoms include:

Check Engine Light

The Check Engine Light usually illuminates after the ECM detects the high voltage condition.

Increased emissions

The Secondary Air Injection System may fail to operate during cold starts, increasing exhaust emissions.

Failed emissions inspection

Vehicles with this code may fail emissions or inspection testing.

Rough cold start

Some engines may idle roughly during the first few minutes after starting.

Poor cold-start performance

Cold engine operation may become less stable until the engine reaches operating temperature.

Reduced fuel efficiency

Although uncommon, some vehicles may experience slightly increased fuel consumption.

Common Causes of P2260

Several issues can cause a Secondary Air Injection System Control "B" Circuit High condition.

Faulty secondary air injection control valve

A failed control valve is one of the most common causes.

Possible failures include:

• Internal short circuit

• Electrical failure

• Sticking valve

Short to battery voltage

The control circuit may contact a battery voltage source.

Possible causes include:

• Damaged insulation

• Melted wiring

• Incorrect wiring repairs

• Wiring harness damage

Open ground circuit

A poor or missing ground may cause the control circuit voltage to remain excessively high.

Possible causes include:

• Broken ground wire

• Loose ground connection

• Corrosion

Damaged wiring harness

The wiring may be damaged by:

• Engine heat

• Vibration

• Abrasion

• Rodent damage

Corroded or loose connectors

Poor electrical connections may create abnormal voltage readings.

Possible issues include:

• Corrosion

• Loose terminals

• Bent connector pins

• Moisture intrusion

Faulty relay

Some Secondary Air Injection systems use a dedicated relay.

A failed relay may create incorrect control circuit voltage.

Faulty secondary air injection pump

An internally damaged pump may overload or affect the control circuit.

ECM problems

Although uncommon, the ECM may incorrectly monitor or control the circuit.

Possible causes include:

• Software errors

• Internal ECM failure

Vehicles Commonly Affected by P2260

P2260 can occur on many gasoline-powered vehicles equipped with Secondary Air Injection systems.

Common examples include:

• BMW gasoline models

• Mercedes-Benz gasoline vehicles

• Audi gasoline models

• Volkswagen gasoline vehicles

• Porsche models

• Toyota vehicles equipped with SAI systems

• Lexus vehicles

• General Motors gasoline engines

• Ford gasoline engines

• Various European, Asian, and American vehicles

The exact system configuration varies by manufacturer.

How Is P2260 Diagnosed?

Proper diagnosis requires inspecting both the electrical circuit and the Secondary Air Injection system.

Check for additional trouble codes

A professional scan tool should check for related trouble codes such as:

• Secondary Air Injection pump codes

• Air switching valve codes

• Relay control codes

• Oxygen sensor codes

Related codes often help identify the root cause.

Inspect the control valve

The control valve should be checked for:

• Proper operation

• Physical damage

• Internal sticking

• Electrical resistance

Inspect wiring and connectors

Technicians should inspect the complete circuit for:

• Short-to-voltage conditions

• Broken wires

• Corrosion

• Loose connectors

• Heat damage

Test the relay

If equipped, the relay should be tested for proper operation and voltage output.

Monitor live data

Using a professional scan tool, technicians should monitor:

• Commanded air injection operation

• Actual circuit voltage

• Pump activation

• Valve operation

Test the air injection pump

The pump should be tested for:

• Proper electrical operation

• Adequate airflow

• Normal current draw

How to Fix P2260

The correct repair depends on the source of the high voltage condition.

Common repairs include:

Replace the secondary air injection control valve

A faulty control valve should be replaced.

Repair damaged wiring

Electrical repairs may include:

• Replacing damaged wires

• Repairing short-to-voltage faults

• Restoring damaged insulation

Repair connector problems

Repairs may include:

• Cleaning corroded terminals

• Replacing damaged connectors

• Tightening loose electrical connections

Replace the relay

A faulty relay should be replaced if testing confirms failure.

Replace the secondary air injection pump

A damaged pump should be replaced if it fails electrical or airflow testing.

Repair ground circuit faults

Ground connections should be cleaned and repaired if necessary.

Repair ECM-related faults

Rarely, ECM software updates or replacement may be required.

After repairs:

1. Clear the diagnostic trouble code.

2. Start the engine from cold.

3. Verify proper Secondary Air Injection system operation.

4. Perform a road test.

5. Confirm that the code does not return.

Can You Drive With P2260?

Driving with P2260 is usually possible because the Secondary Air Injection System primarily affects emissions rather than engine operation.

However, possible consequences include:

• Increased exhaust emissions

• Failed emissions inspection

• Check Engine Light remaining illuminated

• Reduced cold-start emissions performance

The vehicle should be repaired as soon as practical to restore proper emissions system operation.

Is P2260 a Serious Code?

P2260 is generally considered a moderate diagnostic trouble code.

It does not usually cause immediate engine damage, but it can:

• Increase harmful exhaust emissions

• Prevent the Secondary Air Injection System from operating correctly

• Cause emissions inspection failures

• Mask other engine faults while the Check Engine Light remains on

Prompt diagnosis helps maintain emissions compliance and proper engine management.

How to Prevent P2260

Routine maintenance can reduce the likelihood of Secondary Air Injection System faults.

Recommended practices include:

• Inspect wiring near the air injection pump regularly.

• Keep electrical connectors clean and dry.

• Repair damaged wiring immediately.

• Replace worn relays when necessary.

• Inspect vacuum hoses on systems that use vacuum-operated valves.

• Address Check Engine Light warnings promptly.

• Perform regular engine maintenance according to the manufacturer's schedule.

Final Thoughts

P2260 Secondary Air Injection System Control "B" Circuit High indicates that the ECM has detected a voltage signal in the Secondary Air Injection System Control "B" circuit that is higher than the expected operating range.

The most common causes include a faulty control valve, short-to-voltage wiring faults, damaged electrical connectors, an open ground circuit, a defective relay, a faulty air injection pump, or, in rare cases, an ECM malfunction.

A thorough inspection of the control circuit, valves, pump, relay, wiring, and connectors is essential to restore proper Secondary Air Injection System operation, reduce emissions, and ensure compliance with emissions regulations.