P2B72
Coolant Heater A Control Circuit/Open
P2B72 is an OBD-II diagnostic trouble code meaning: Coolant Heater A Control Circuit/Open. Common causes: heater control circuit open, coolant heater malfunction. Estimated repair cost: $17–56.
Symptoms
- Extended engine warm-up time
- Unstable operation at idle
- Check Engine light comes on
- Reduced engine efficiency in cold weather
Causes
- Heater control circuit open
- Coolant heater malfunction
- Relay or fuse problems
- Control module malfunction
- Corrosion or poor contact in connectors
How to Fix
- Check heater circuit fuse and relay
- Inspect connectors and wires for damage
- Check heater resistance
- Diagnose the control module
- Replace coolant heater if necessary
Related codes
Error P2B72 by Vehicle Brand
FAQ
What does the P2B72 code mean?
P2B72 is an OBD-II diagnostic trouble code that indicates: Coolant Heater A Control Circuit/Open
What causes a P2B72 error code?
The most common causes of P2B72 include: Heater control circuit open; Coolant heater malfunction; Relay or fuse problems; Control module malfunction.
How do I fix a P2B72 diagnostic trouble code?
To fix P2B72: Check heater circuit fuse and relay. Inspect connectors and wires for damage. Check heater resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2B72?
Yes, but get it checked soon
How much does it cost to fix P2B72?
The estimated repair cost for P2B72 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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