P039B: The cylinder 1 pressure is above normal
The cylinder 1 pressure is above normal. It may be the part itself, its connector or the wiring.
| Code | P039B |
|---|---|
| System | Engine and transmission |
| Group | P03xx, Ignition and misfires |
| Type | Generic: it means the same on every make |
How to read and clear P039B 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 P039B 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
- P0397 The cylinder 1 pressure sensor gives a lower signal than normal
- P0398 The cylinder 1 pressure sensor gives a higher signal than normal
- P0399 The cylinder 1 pressure sensor fails now and then
- P039A The cylinder 1 pressure is below normal
- P039C The cylinder 1 pressure variation gives a lower signal than normal
- P039D The cylinder 1 pressure variation gives a higher signal than normal
- P039E Combustion in cylinder 1 is not performing as expected
- P039F The cylinder 2 pressure sensor has an electrical fault
- P0300 Random or multiple cylinder misfire
- P0301 Misfire detected in cylinder 1
- P0302 Misfire detected in cylinder 2
- P0303 Misfire detected in cylinder 3
What does code P039B mean?
The cylinder 1 pressure is above normal. It may be the part itself, its connector or the wiring.
How do you clear P039B?
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, P039B 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.
