OBD-II code · Powertrain (generic, extended)
P2A29 Alternative Fuel Tank Shutoff Valve C Control Circuit High
The control circuit of alternative fuel tank shutoff valve C reports a control circuit high condition. Tank isolation cannot be commanded as expected on multi-tank CNG/LPG systems.
Is it safe to drive with P2A29?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to B+
- PossibleOpen valve coil
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Tank Shutoff Valve C, Wiring Harness, Afcm
Related codes
- P224FAlternative Fuel Tank Shutoff Valve A Control Circuit High
- P2A25Alternative Fuel Tank Shutoff Valve B Control Circuit High
- P2A2DAlternative Fuel Tank Shutoff Valve D Control Circuit High
- P2A31Alternative Fuel Tank Shutoff Valve E Control Circuit High
- P2A26Alternative Fuel Tank Shutoff Valve C Control Circuit/Open
- P2A27Alternative Fuel Tank Shutoff Valve C Control Circuit Performance/Stuck Off
- P2A28Alternative Fuel Tank Shutoff Valve C Control Circuit Low
- P2A2AAlternative Fuel Tank Shutoff Valve D Control Circuit/Open
- P2A2BAlternative Fuel Tank Shutoff Valve D Control Circuit Performance/Stuck Off
- P2A2CAlternative Fuel Tank Shutoff Valve D Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.