Manifold Absolute Pressure Sensor Circuit High Input
The P0108 code means the vehicle's onboard diagnostic system has detected: Manifold Absolute Pressure Sensor Circuit High Input. This is a serious severity code.
- Keep driving?
- Limited driving only
- DIY difficulty
- easy
- Estimated cost
- $30-$100 for MAP sensor
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What Are the Symptoms of P0108?
- Check Engine Light on
- Engine runs rich (high MAP reads as heavy load, so the ECM adds fuel)
- Hesitation
- Hard starting
- Reduced power
What Causes P0108? (Most Likely First)
- Faulty MAP sensor producing high voltage Very High
- Short to voltage on signal wire High
- Blocked or crimped vacuum hose to MAP sensor Moderate
- Failed sensor internals Moderate
Can I Still Drive with P0108?
Limited driving only. P0108 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Common Fixes by Vehicle
What techs usually find when diagnosing P0108 on specific vehicles — tap your vehicle for the fix and the exact part:
2005-2014 GM 4.8L/5.3L/6.0L (Silverado, Tahoe, Suburban) Easy DIY
MAP sensor voltage too high, typically from loss of vacuum signal at the sensor (plugged vacuum port or collapsed hose) or sensor gone open-circuit. Replace sensor and clear the vacuum port with compressed air.
Labor: 15-30 min2005-2015 Ford Explorer/F-150 4.0L/4.6L/5.0L Easy DIY
MAP high voltage often from a disconnected signal wire at the TMAP connector. Repin or replace the connector, and replace the sensor if no damage found. Verify the PCM ground (G100/G101) integrity.
Labor: 30 min2011-2018 Chrysler/Dodge 3.6L Pentastar Easy DIY
MAP sensor reads above 4.5V constantly — usually a shorted signal wire or completely failed sensor. Replace sensor first; if code returns, wiggle-test the harness and look for chafe at the EGR pipe.
Labor: 30-45 minFrequently Asked Questions
Can a blocked vacuum hose cause P0108?
Yes. If the hose to the MAP sensor is kinked or plugged, the sensor always sees atmospheric pressure instead of manifold vacuum, resulting in a continuously high voltage reading.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0108?
-
Check MAP signal voltage at idle. Should be approximately 1-2V. Above 4V at idle indicates a high-output fault.
-
Inspect the vacuum hose for crimping or blockage. A blocked hose reads atmospheric pressure (high voltage) regardless of actual manifold vacuum.
-
Check signal wire for shorts to 5V reference or 12V.
-
Replace MAP sensor and retest.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P0108 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P0108?
- Dodge Durango and Dakota
- Chevrolet Cobalt (2.2L)
- Jeep Liberty and Wrangler
- Honda Odyssey
- Pontiac Sunfire
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