OBD-II code · Powertrain (generic, extended)
P274B Transmission Fluid Temperature Sensor C Circuit Range/Performance
The third transmission fluid temperature sensor reading is implausible. 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 P274B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleSensor drift after thermal aging
- PossibleSensor not seated properly in the fluid path
- Less likelySensor element aged beyond calibration window
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Trans Fluid Temp Sensor C
Related codes
- P2741Transmission Fluid Temperature Sensor B Circuit Range/Performance
- P275BTransmission Fluid Temperature Sensor D Circuit Range/Performance
- P2748Intermediate Shaft Speed Sensor B Circuit Intermittent
- P2749Intermediate Shaft Speed Sensor C Circuit
- P274ATransmission Fluid Temperature Sensor C Circuit
- P274CTransmission Fluid Temperature Sensor C Circuit Low
- P274DTransmission Fluid Temperature Sensor C Circuit High
- P274ETransmission Fluid Temperature Sensor C Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.