OBD-II code · Powertrain (generic)
P01B6 Alternative Fuel Rail Temperature Sensor Circuit Low
Alt fuel rail temp sensor signal voltage below 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 P01B6?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
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 Rail Temp Sensor, Sensor Wiring
Related codes
- P01B3Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic
- P01B4Alternative Fuel Rail Temperature Sensor Circuit
- P01B5Alternative Fuel Rail Temperature Sensor Performance
- P01B7Alternative Fuel Rail Temperature Sensor Circuit High
- P01B8Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic
- P01B9Engine Oil Temperature Sensor B Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.