P044FAIR System Switching Valve A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- After a cold start the secondary air pump blows fresh air into the exhaust; switching valve A is the electrically driven valve that opens this path. GM checks the valve circuit in three codes – P0412 open, P041F shorted to ground, P044F shorted to positive – while other makers use P0413/P0414 or P0412 for everything. P044F means the control circuit is shorted to positive or the coil is low-resistance: when the driver switches on, the line stays high. GM sets the code at 0.5 Ω or less to the supply (20 of 25 samples of 250 ms, above 11 V, MIL after two trips). The valve then does not open, secondary air is missing and P0411 may follow.
- What you may notice
- Check engine light on (after two trips)
- No change in driving
- Secondary air readiness not set, possibly P0411
- Likely causes
- LikelyValve coil shorted internally (low resistance)
- PossibleControl wire chafed against a supply wire
- PossibleWater in the connector bridging to the supply
- RareDriver in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.