P0108: Manifold absolute pressure (MAP) sensor circuit high
The ECU sees a voltage that is too high from the manifold pressure sensor. Usually a poor earth, a wiring fault or the sensor itself.
| Code | P0108 |
|---|---|
| System | Engine and transmission |
| Group | P01xx, Air and fuel metering |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0108 means
The MAP sensor sends a voltage that rises with manifold pressure. If the ECU sees it above what is possible, it stores this code. Typical causes are a broken sensor earth, a signal wire touching a live feed or a failed sensor. It can also appear if the sensor’s vacuum hose is blocked.
Most common causes
- MAP sensor connector with corrosion, moisture or loose pins
- Sensor earth broken or poor
- Chafed signal wire touching a live wire
- Sensor vacuum hose loose or blocked
- A faulty MAP sensor
Symptoms
- Engine warning light on
- Engine running rich: higher consumption and black smoke on diesels
- Loss of power or jerking
- Rough idle
Can you drive with P0108?
With care You can drive, but the engine may use more fuel and foul the catalytic converter or particulate filter. Get it fixed soon.
Open the bonnetthe in-depth explanation
How to check it
At idle, manifold pressure in live data should sit clearly below atmospheric. If it reads the same as, or more than, with the engine off, check the vacuum hose and connector before replacing the sensor.
How to read and clear P0108 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 P0108 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
- P0104 Air flow sensor circuit intermittent
- P0105 Manifold absolute pressure (MAP) sensor circuit fault
- P0106 Manifold absolute pressure (MAP) sensor range or performance
- P0107 Manifold absolute pressure (MAP) sensor circuit low
- P0109 Manifold absolute pressure (MAP) sensor circuit intermittent
- P010A There is a fault in the air mass meter B circuit
- P010B The MAF or VAF meter B circuit performs outside its expected range
- P010C The electrical signal from MAF or VAF meter B is too low
- P0100 Mass or volume air flow sensor circuit fault
- P0101 Air flow sensor range or performance problem
- P0102 Air flow sensor circuit low input
- P0103 Air flow sensor circuit high input
What does code P0108 mean?
The MAP sensor sends a voltage that rises with manifold pressure. If the ECU sees it above what is possible, it stores this code. Typical causes are a broken sensor earth, a signal wire touching a live feed or a failed sensor. It can also appear if the sensor’s vacuum hose is blocked.
Can you drive with P0108?
You can drive, but the engine may use more fuel and foul the catalytic converter or particulate filter. Get it fixed soon.
How do you clear P0108?
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, P0108 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.
