Fuel and air metering
P0108 — Manifold Absolute Pressure/Barometric Pressure Circuit High Input
The MAP sensor signal voltage is higher than normal. The ECU sees very high intake pressure, so it may enrich the mixture and cut performance.
Common causes
- Faulty MAP sensor
- Signal wire shorted to voltage
- Open sensor ground
- Clogged or restricted vacuum line
- Connector damage
Symptoms
- Rich mixture and black smoke
- Poor fuel economy
- Rough running
- Check engine light
How to check
- Inspect the connector and wiring for a short to voltage
- Check the sensor ground and 5 V reference
- Check the vacuum line for clogging
- Replace the sensor if it still reads high
Can you keep driving?
Drivable in the short term, but a rich mixture wastes fuel and stresses the catalytic converter.
Related codes
Frequently asked questions
- What does P0108 mean?
- The MAP sensor is sending a voltage above its normal range.
- Is P0108 caused by a vacuum leak?
- Usually a vacuum leak lowers or confuses the reading; P0108 more often comes from the sensor, its ground or a shorted wire.
General reference information. It does not replace a diagnosis on your own vehicle. The same code can have different causes depending on make, model year and engine; check the manufacturer's documentation or ask a technician with a scan tool.