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SensorsModerate✅ DIY Friendly

P0108

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

⚠️ Symptoms

✅ How to Fix — Step by Step

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

Repair Cost Estimate

Full Repair Estimate
$30–$200
DIY Possible?
YES
Severity
Moderate

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.

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