What it means
AIR system control B drive line stuck high — short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The secondary air injection system sends air into the exhaust to reduce emissions, and its control B circuit operates a related system component. The module sets P2260 when it detects that the control B circuit voltage is higher than expected, such as from a short to battery voltage or an open circuit that the system interprets as high.
Common causes
Most likely first.
- Short to B+
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Check-engine light may illuminate
- Secondary-air system warning or emissions fault may be stored
- Usually no noticeable change in driving
How to diagnose it
- Read freeze-frame data and check whether P2260 is current or intermittent, noting when the secondary-air system was commanded.
- Inspect the control B wiring route and connector for chafing, water intrusion, corrosion, pushed-back pins, or contact with a power source.
- With the circuit status monitored, gently move the harness to see whether the fault changes, and note any response.
- Check the control B circuit for an unintended connection to battery voltage and verify continuity and connector contact condition using the wiring diagram.
- Test the controlled component and its driver circuit according to the manufacturer's procedure before replacing parts.
Common fixes
- Repair a control B wire shorted to battery voltage.
- Clean or repair corroded, wet, or loose connector terminals.
- Correct a pinched harness or restore pushed-back terminals.
- Replace a failed controlled component or driver only if circuit tests identify it as the cause.
Can I keep driving?
Driving is usually unaffected, but the secondary-air system may not reduce emissions as intended and the vehicle may fail an emissions inspection. Avoid ignoring the warning if local inspection or emissions rules apply.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.