Engine Coolant Heater B Control Circuit High
Engine Coolant Heater B Control Circuit High: the control-circuit voltage is above the expected range. Often an open circuit or a short to supply voltage.
Affected components
- Coolant heater b
- Heater wiring
Common causes
- High likelihood: Wiring shorted to battery
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Supply wire pinched against B+ source
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.