Secondary Air Injection System Control "B" Circuit High
P2260 indicates the secondary air injection (SAI) system control circuit B is reporting a voltage that is higher than the PCM expects. The secondary air injection pump injects fresh air into the exhaust manifold during cold start and warm-up to reduce emissions, and this code means the control signal or circuit to that system is malfunctioning.
What You Might Notice
- Secondary air injection system disabled or not operating
- Check Engine light illuminated
- Peculiar noises from engine compartment (air pump running continuously or not at all)
- Increased emissions during cold start
- No obvious drivability symptoms in most cases
Most Common Causes
- 1
Blown fuse or relay
The secondary air injection system fuse or relay may be blown or failed, causing an open circuit that the PCM detects as high voltage.
- 2
Open or shorted control wiring
The control circuit wiring between the PCM and the SAI pump motor may be open, corroded, or shorted to power, causing incorrect voltage readings.
- 3
Defective SAI pump motor
The secondary air injection pump motor itself may have failed or developed high resistance, preventing proper circuit operation.
- 4
PCM programming error or defect
The powertrain control module may have a software glitch or hardware failure causing it to misinterpret the circuit voltage as high.
How to Diagnose It
- 1
Check Blown fuse or relay — The secondary air injection system fuse or relay may be blown or failed, causing an open circuit that the PCM detects as high voltage.
- 2
Check Open or shorted control wiring — The control circuit wiring between the PCM and the SAI pump motor may be open, corroded, or shorted to power, causing incorrect voltage readings.
- 3
Check Defective SAI pump motor — The secondary air injection pump motor itself may have failed or developed high resistance, preventing proper circuit operation.
- 4
Check PCM programming error or defect — The powertrain control module may have a software glitch or hardware failure causing it to misinterpret the circuit voltage as high.
How to Fix It
- 1
Check and replace SAI system fuse
Locate the secondary air injection fuse in the fuse box using the vehicle's service manual. If blown, replace with the correct amperage rating. Test the circuit after replacement.
- 2
Inspect and repair wiring harness
Visually inspect the SAI control circuit wiring from the PCM to the pump motor for damage, corrosion, or loose connections. Repair or replace damaged wiring and ensure all connections are clean and tight.
- 3
Test and replace SAI pump motor
Use a multimeter to test the pump motor resistance and voltage. If the motor is defective or has excessive resistance, replace the secondary air injection pump assembly.
- 4
Reprogram or replace PCM
If all circuit components test normal, the PCM may need reprogramming with updated software or replacement. Contact the vehicle manufacturer for PCM programming or have the module replaced by a qualified technician.
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