P0108
Medium SeverityMAP/BARO Sensor Circuit High Input
Fuel System
What Does P0108 Mean?
MAP sensor voltage is higher than maximum expected range. The ECM reads this as very low vacuum.
Common Fix
Replace MAP sensor
Estimated Cost (DIY)
$20 - $80
Symptoms
- ⚠️Lean running
- ⚠️Loss of power
- ⚠️Surging at idle
- ⚠️Check engine light
Common Causes
Faulty MAP sensorlikely
Open circuit in signal wirepossible
Large vacuum leakpossible
Damaged connectorpossible
How to Diagnose P0108
- 1Check MAP sensor connector
- 2Measure sensor output voltage with KOEO
- 3Check signal wire for open circuit
- 4Replace sensor if stuck high
Need to read or clear this code?
Shop OBD2 Scanners on Amazon →Frequently Asked Questions
- Can a vacuum leak cause P0108?
- Yes, a large vacuum leak can cause MAP readings to stay high (near atmospheric pressure), triggering P0108.
- How do I test a MAP sensor?
- With ignition on, MAP sensor should read about 4.5V at atmospheric pressure and drop to 1-2V at idle vacuum.