Powertrain
Definition only
Lights the check engine lamp
P2B2B: Engine Coolant Temperature Sensor 5 Circuit
Standardized SAE J2012 code · P2Bxx codes
What does P2B2B mean?
The ECM detects a generic fault on the engine coolant temperature 5 sensor circuit. Reading cannot be used reliably for control.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Common causes
- High Sensor failed
- Medium Wiring or connector fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2B2B on the same make and model first.
P2B2B in the community
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