P0E77: The coolant bypass valve A control gives a higher signal than normal
The coolant bypass valve A control gives a higher signal than normal. It is usually the part, its wiring or a connector with poor contact.
| Code | P0E77 |
|---|---|
| System | Engine and transmission |
| Group | P0Exx, Hybrid and electric |
| Type | Generic: it means the same on every make |
How to read and clear P0E77 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 P0E77 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
- P0E72 The charging control pilot signal frequency is lower than it should be
- P0E73 The charging control pilot signal frequency is higher than it should be
- P0E75 The coolant bypass valve A control has a broken or disconnected wire
- P0E76 The coolant bypass valve A control gives a lower signal than normal
- P0E78 The coolant bypass valve A control gives readings outside the normal range
- P0E7A The coolant bypass valve A control has got stuck
- P0E7B The coolant bypass valve B control has a broken or disconnected wire
- P0E7C The coolant bypass valve B control gives a lower signal than normal
What does code P0E77 mean?
The coolant bypass valve A control gives a higher signal than normal. It is usually the part, its wiring or a connector with poor contact.
How do you clear P0E77?
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, P0E77 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.
