P274B: Transmission Fluid Temperature Sensor C Circuit Range/Performance
Standardized SAE J2012 code · P27xx — Transmission
What does P274B mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- Medium Sensor drift after thermal aging
- Medium Sensor not seated properly in the fluid path
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
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P274B in the community
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