P0108 - MAP/BARO High Input

MAP signal high/open.

Code Overview

MAP signal high/open.

Common Causes

• Open circuit in the MAP signal or ground path
• Failed MAP sensor reading too high
• Vacuum hose off or port unplugged on older systems
• Poor connector fit or corrosion at the sensor

Symptoms

• Hard starting or rich-running behavior
• Idle quality problems
• Poor throttle response or reduced fuel economy

Diagnostic Steps

1. Inspect the MAP connector, wiring, and vacuum source if the system uses one
2. Verify reference voltage, ground, and signal integrity at the sensor
3. Compare MAP data to key-on barometric pressure and live engine load
4. Check for an unplugged hose or port before replacing the sensor

Repair Difficulty

Easy

General difficulty estimate for the most common repair path.

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

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Next Steps

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