P0689: The engine control relay monitoring signal is low
The engine control relay monitoring signal is low. The relay, connector and wiring need checking.
| Code | P0689 |
|---|---|
| System | Engine and transmission |
| Group | P06xx, Control unit and auxiliary outputs |
| Type | Generic: it means the same on every make |
How to read and clear P0689 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 P0689 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
- P0685 ECM/PCM power relay control: circuit open
- P0686 ECM/PCM power relay control: circuit low
- P0687 ECM/PCM power relay control: circuit high
- P0688 ECM/PCM power relay sense: circuit open
- P068A The engine control relay switches off too early
- P068B The engine control relay switches off too late
- P068C The cylinder 7 glow plug control gives a lower signal than normal
- P068D The cylinder 7 glow plug control gives a higher signal than normal
- P0600 Serial communication link fault
- P0601 Internal control module memory checksum error
- P0602 Control module programming error
- P0603 Internal control module keep alive memory (KAM) error
What does code P0689 mean?
The engine control relay monitoring signal is low. The relay, connector and wiring need checking.
How do you clear P0689?
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, P0689 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.
