Powertrain
generic / SAE
P2BB4
Engine Coolant Temperature Sensor 4 Circuit Intermittent/Erratic
The signal of engine coolant temperature sensor 4 drops out or jumps intermittently. Loose connector or noisy ground reference.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / B4
Possible causes
- Sensor connector not seated high
- Noisy ground reference medium
- Connector with intermittent contact under vibration low
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
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 50–250 €
- Estimated time: 0.3–1.5 h
- Component: engine coolant temperature sensor 4
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012