P2A33AFCM Power Relay Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A33 concerns the control line that grounds the coil of the relay supplying the gas control module. Low means this line already sits near zero volts while the driver is switched off. A chafed wire touching the body is the classic finding; a coil with shorted windings can give the same picture. Since the coil is then permanently grounded, the relay may stay energised after the key is off, keeping the gas module awake and draining the battery overnight. Nobody publishes this code for a production gas system. Saab's GM Europe V6 manual, written for the engine relay twin P0686, lets the test run only between 10 and 18 V supply with the engine turning above 80 rpm and classes it as a Type C code, meaning no warning lamp there. CARB expects actuator outputs to be checked for such shorts.
- What you may notice
- Check engine light, depending on calibration
- Battery flat after the vehicle has been parked
- Gas module stays active after ignition off
- Likely causes
- LikelyControl wire chafed through and touching ground
- PossibleShorted turns in the relay coil
- RareMoisture in the relay socket bridging to ground
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.