OBD2 Error Code P0108: How to Fix It

Medium 45-90 minutes High Severity Verified June 2026
Error Code
P0108
Brand
OBD2
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
45-90 minutes
OBD2 error code P0108 indicates that your vehicle's Engine Control Module (ECM) is receiving an abnormally high voltage signal from the Manifold Absolute Pressure (MAP) sensor. This sensor measures intake manifold pressure to help the ECM determine proper fuel delivery and ignition timing. When this code appears, your engine may run rough, stall, or have poor acceleration.
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Tools You'll Need

How to Fix Error Code P0108

  1. Turn off engine and ensure safety

    Never work on a hot engine. Allow at least 30 minutes cooling time to prevent burns from hot components.
  2. Locate the MAP sensor

  3. Inspect electrical connections

    Handle electrical connections gently to avoid breaking fragile plastic connectors.
  4. Check vacuum lines

  5. Test MAP sensor voltage

    Be careful around moving engine parts when testing with engine running.
  6. Perform vacuum test

  7. Replace MAP sensor if faulty

    Do not overtighten sensor bolts as this can crack the plastic housing.
  8. Clear codes and test drive

Parts You May Need

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When to Call a Professional

Contact a professional mechanic if you're uncomfortable working with electrical systems, if the problem persists after sensor replacement, or if you discover wiring damage that extends into the vehicle's main harness. Also seek professional help if you lack the proper diagnostic tools or experience with vacuum system diagnosis.

Frequently Asked Questions

Can I drive with P0108 error code?
You should avoid driving with P0108 as it can cause poor engine performance, stalling, and potential engine damage. The engine may run rough or fail to start, making driving unsafe.
What causes MAP sensor to read high voltage?
High voltage readings typically result from a disconnected vacuum line, faulty sensor internal circuitry, corroded electrical connections, or damaged wiring sending false high signals to the ECM.
How much does it cost to fix P0108?
DIY repairs typically cost $30-80 for a new MAP sensor plus any needed vacuum hoses. Professional diagnosis and repair usually ranges from $150-300 depending on labor rates and parts needed.
Will P0108 cause my car to fail emissions testing?
Yes, P0108 will typically cause emissions test failure since it affects air-fuel mixture calculations. The code must be resolved and the readiness monitors reset before passing emissions testing.
How often do MAP sensors need replacement?
MAP sensors typically last 60,000-100,000 miles under normal conditions. However, they can fail earlier due to contamination, electrical issues, or exposure to extreme temperatures.