OBD-II code · Powertrain (generic, extended)
P2B72 Coolant Heater A Control Circuit/Open
The control circuit of coolant heater A reports a control circuit/open condition. Auxiliary preheating of the coolant cannot be commanded as expected.
Is it safe to drive with P2B72?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in heater control wire
- PossibleOpen heater element
- Less likelyPin pushed back out of connector body
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Heater A, Wiring Harness, Ecm
Related codes
- P2B76Coolant Heater B Control Circuit/Open
- P2B6FTurbocharger/Supercharger A Temperature Sensor Circuit Low
- P2B70Turbocharger/Supercharger A Temperature Sensor Circuit High
- P2B71Turbocharger/Supercharger A Temperature Sensor Range/Performance
- P2B73Coolant Heater A Control Circuit Low
- P2B74Coolant Heater A Control Circuit High
- P2B75Coolant Heater A Control Circuit Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.