P2B79: The coolant heater B control gives readings outside the normal range
The coolant heater B control gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
| Code | P2B79 |
|---|---|
| System | Engine and transmission |
| Group | P2Bxx, Engine and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2B79 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2B79 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2B75 The coolant heater A control gives readings outside the normal range
- P2B76 The coolant heater B control has a broken or disconnected wire
- P2B77 The coolant heater B control gives a lower signal than normal
- P2B78 The coolant heater B control gives a higher signal than normal
- P2B7A The evaporative emission system pressure sensor C has an electrical fault
- P2B7B The evaporative emission system pressure sensor C gives readings outside the
- P2B7C The evaporative emission system pressure sensor C gives a lower signal than
- P2B7D The evaporative emission system pressure sensor C gives a higher signal than
- P2BAC NOx exceedance: EGR deactivated
What does code P2B79 mean?
The coolant heater B control gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
How do you clear P2B79?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2B79 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
