OBD-II code · Powertrain (generic)
P01EA Engine Coolant Heater A Control Circuit High
Engine Coolant Heater A Control Circuit High: the control-circuit voltage is above the expected range. Often an open circuit or a short to supply voltage.
Is it safe to drive with P01EA?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring shorted to battery
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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 A, Heater Wiring
Related codes
- P01EEEngine Coolant Heater B Control Circuit High
- P01E7Engine Coolant Temperature Sensor 3 Circuit Intermittent/Erratic
- P01E8Engine Coolant Heater A Control Circuit/Open
- P01E9Engine Coolant Heater A Control Circuit Low
- P01EBEngine Coolant Heater A Control Circuit Performance
- P01ECEngine Coolant Heater B Control Circuit/Open
- P01EDEngine Coolant Heater B Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.