P2B79
Coolant Heater B Control Circuit Performance
P2B79 is an OBD-II diagnostic trouble code meaning: Coolant Heater B Control Circuit Performance. Common causes: coolant heater malfunction, problems in the electrical circuit (open or short circuit). Estimated repair cost: $28–89.
Symptoms
- Extended engine warm-up time
- Less efficient interior heating
- Check Engine Light Illuminates
- Possible errors in related systems
- Reduced coolant temperature in cold weather
Causes
- Coolant heater malfunction
- Problems in the electrical circuit (open or short circuit)
- Faulty relay or fuse
- Problems with the control unit
- Corrosion of contacts or connectors
How to Fix
- Check heater circuit fuses and relays
- Inspect the electrical circuit for damage
- Check heater resistance
- Check connectors and contacts for oxidation
- If necessary, replace the coolant heater
Related codes
Error P2B79 by Vehicle Brand
FAQ
What does the P2B79 code mean?
P2B79 is an OBD-II diagnostic trouble code that indicates: Coolant Heater B Control Circuit Performance
What causes a P2B79 error code?
The most common causes of P2B79 include: Coolant heater malfunction; Problems in the electrical circuit (open or short circuit); Faulty relay or fuse; Problems with the control unit.
How do I fix a P2B79 diagnostic trouble code?
To fix P2B79: Check heater circuit fuses and relays. Inspect the electrical circuit for damage. Check heater resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2B79?
Yes, but get it checked soon
How much does it cost to fix P2B79?
The estimated repair cost for P2B79 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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