Powertrain
generic / SAE
P2B78
Coolant Heater B Control Circuit High
The control circuit of coolant heater B reports a control circuit high condition. Auxiliary preheating of the coolant cannot be commanded as expected.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / 78
Possible causes
- Control wire shorted to B+ high
- Open heater element medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–600 €
- Estimated time: 0.5–3 h
- Component: coolant heater b
- Component: wiring harness
- Component: ecm
- MIL / check engine light
Sources
References
sae:J2012