P041F
PPowertrainSecondary Air Switching Valve A Circuit Low
What does this code mean?
Severity : LowP041F indicates a low voltage condition in the switching valve A circuit of the secondary air injection system. This system pumps fresh air into the exhaust during cold starts so the catalytic converter warms up faster. The engine control module has detected a short to ground or a control fault.
Symptoms
- Check engine light on.
- Higher emissions after a cold start.
- Possible emissions test failure.
- Usually no effect on driveability.
Possible causes
- Faulty secondary air switching valve.
- Wiring shorted to ground.
- Corroded or damaged connector.
- Faulty relay or fuse in the circuit.
- Engine control module fault, which is rare.
Diagnosis and repair
- Inspect the valve connector and wiring.
- Measure valve resistance with a multimeter.
- Check the control circuit for a short to ground.
- Command the valve with a scan tool to confirm operation.
- Replace the faulty part, clear the code and recheck on the next cold start.
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Code
P041F
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012