OBD-II code · Powertrain (generic)
P01AD Alternative Fuel Tank Temperature Sensor Circuit High
Alt fuel tank temp sensor signal voltage above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P01AD?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire open
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Tank Temp Sensor, Sensor Wiring
Related codes
- P01AAAlternative Fuel Tank Temperature Sensor Circuit
- P01ABAlternative Fuel Tank Temperature Sensor Range/Performance
- P01ACAlternative Fuel Tank Temperature Sensor Circuit Low
- P01AEAlternative Fuel Tank Temperature Sensor Circuit Intermittent/Erratic
- P01AFAlternative Fuel Tank A Level Sensor Circuit
- P01B0Alternative Fuel Tank A Level Sensor Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.