BARO To MAP Sensor Comparison Too High

Category

Powertrain - Computer and Auxiliary Controls

Severity

Check Engine Light

Applies to

Silverado, Sierra, Tahoe, Yukon, Equinox

Related

No single generic twin. See OBD Codes List

Findings, check these first

• Skewed BARO reading inside the PCM at key-on
• Failing MAP sensor reading high relative to BARO
• Restricted air intake or clogged air filter skewing MAP
• Vacuum leak downstream of the throttle body
• PCM calibration needing an update for BARO rationality

Standard procedure

1. Record key-on BARO versus local barometric pressure with a Tech2 or GDS2
2. Inspect the air filter and intake tract for restriction
3. Smoke-test the intake for vacuum leaks
4. Compare MAP readings at key-on, idle, and wide-open throttle against spec
5. Reflash or replace the PCM only as a last resort after sensor tests pass

Look up another code

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Related Computer and Auxiliary Controls codes

• P1106Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
• P1107Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
• P1111Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage
• P1112Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage