OBD-II code · Powertrain (generic)
P01EC Engine Coolant Heater B Control Circuit/Open
Engine Coolant Heater B Control Circuit/Open: the control circuit is open. Likely a broken wire, disconnected connector, or failed actuator.
Is it safe to drive with P01EC?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring break
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Coolant Heater B, Heater Wiring
Related codes
- P01E8Engine Coolant Heater A Control Circuit/Open
- P01E9Engine Coolant Heater A Control Circuit Low
- P01EAEngine Coolant Heater A Control Circuit High
- P01EBEngine Coolant Heater A Control Circuit Performance
- P01EDEngine Coolant Heater B Control Circuit Low
- P01EEEngine Coolant Heater B Control Circuit High
- P01EFEngine Coolant Heater B Control Circuit Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.