P2A36AFCM Power Relay Sense Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A36 is set when the relay feeding the gas control module has been commanded on, yet the voltage read back after its contacts stays too low. Burnt or pitted contacts, a high-resistance joint, a grounded sense wire or a blown fuse in the switched path all lead there, as does a weak battery during cranking. For the comparable engine relay code P0689, GM Europe on the 2010 Saab V6 uses a limit of 6 V held for more than 1 s and treats the result as Type C. No public calibration names P2A36 for a gas system. If the module really runs short of voltage, it may reset or drop off the network, which Roush's Ford propane trucks report as U0108; in a bi-fuel car the engine then returns to petrol.
- What you may notice
- Check engine light, depending on calibration
- Gas mode drops out, bi-fuel vehicle switches to petrol
- Communication fault with the gas module stored as well
- Likely causes
- LikelyWorn or burnt relay contacts
- PossibleBlown fuse in the switched supply
- PossibleSense wire shorted to ground
- RareWeak battery or poor main 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.