SensorsModerate✅ DIY Friendly

P0108

Q: What does OBD2 code P0108 mean?

P0108 means: MAP Sensor Circuit High Input. The ECM has detected that the Manifold Absolute Pressure (MAP) sensor signal voltage is higher than the expected operating range, causing the ECM to calculate an inaccurate engine load and richen the fuel mixture.

MAP Sensor Circuit High Input

The ECM has detected that the Manifold Absolute Pressure (MAP) sensor signal voltage is higher than the expected operating range, causing the ECM to calculate an inaccurate engine load and richen the fuel mixture.

SeverityModerate

CategorySensors

Est. Repair Cost$30–$200

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Short to voltage in signal wire
›Failed MAP sensor
›Blocked vacuum line
›ECM fault

⚠️ Symptoms

›High idle
›Lean running
›Check engine light

✅ How to Fix — Step by Step

Step 1:Inspect vacuum line for blockage
Step 2:Check wiring
Step 3:Replace MAP sensor

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Basic Hand Tools
✔Flashlight
✔Vehicle Service Manual

Using the correct diagnostic tools helps identify the root cause of P0108 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Compare live MAP sensor voltage against a known-good barometric reading at key-on, engine-off; a value far outside 4-5V at sea level with the engine off points to a bad sensor rather than a wiring issue.

Frequently Asked Questions

What does OBD2 code P0108 mean?+

P0108 stands for MAP Sensor Circuit High Input. The ECM has detected that the Manifold Absolute Pressure (MAP) sensor signal voltage is higher than the expected operating range, causing the ECM to calculate an inaccurate engine load and richen the fuel mixture.

What causes code P0108?+

Short to voltage in signal wire; Failed MAP sensor; Blocked vacuum line; ECM fault

How do I fix code P0108?+

Inspect vacuum line for blockage; Check wiring; Replace MAP sensor

How much does it cost to fix P0108?+

Estimated repair cost for P0108 is $30–$200.

Is P0108 DIY-friendly?+

Yes — P0108 is generally DIY-friendly with basic tools.