P2B77
Coolant Heater B Control Circuit Low
P2B77 is an OBD-II diagnostic trouble code meaning: Coolant Heater B Control Circuit Low. Common causes: coolant heater malfunction, open or short circuit in control circuit. Estimated repair cost: $17–56.
Symptoms
- Extended engine warm-up time
- Decrease in interior heating efficiency
- Check Engine Light Illuminates
- Unstable engine operation at idle
Causes
- Coolant heater malfunction
- Open or short circuit in control circuit
- Relay or fuse problems
- Engine control unit malfunction
- Poor contact in circuit connectors
How to Fix
- Check heater circuit fuses and relays
- Inspect the wiring harness for damage
- Check heater resistance
- Diagnose the engine control unit
- Replace coolant heater if necessary
Related codes
Error P2B77 by Vehicle Brand
FAQ
What does the P2B77 code mean?
P2B77 is an OBD-II diagnostic trouble code that indicates: Coolant Heater B Control Circuit Low
What causes a P2B77 error code?
The most common causes of P2B77 include: Coolant heater malfunction; Open or short circuit in control circuit; Relay or fuse problems; Engine control unit malfunction.
How do I fix a P2B77 diagnostic trouble code?
To fix P2B77: Check heater circuit fuses and relays. Inspect the wiring harness for damage. Check heater resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2B77?
Yes, but get it checked soon
How much does it cost to fix P2B77?
The estimated repair cost for P2B77 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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