OBD-II code · Powertrain (generic)
P0188 Fuel Temperature Sensor B Circuit High Input
Fuel temperature sensor B signal exceeds maximum. Shorted to voltage, open ground or open sensor. 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 P0188?
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 voltage
- PossibleSensor open-circuit
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Temperature Sensor B, Sensor Wiring
Related codes
- P0183Fuel Temperature Sensor A Circuit High Input
- P0185Fuel Temperature Sensor B Circuit Malfunction
- P0186Fuel Temperature Sensor B Circuit Range / Performance
- P0187Fuel Temperature Sensor B Circuit Low Input
- P0189Fuel Temperature Sensor B Circuit Intermittent
- P018AFuel Pressure Sensor B Circuit
- P018BFuel Pressure Sensor B Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.