MAP/BARO Pressure Switch Solenoid Circuit Malfunction (GM/Honda)
What does P1105 mean?
The P1105 code means the vehicle's onboard diagnostic system has detected: MAP/BARO Pressure Switch Solenoid Circuit Malfunction (GM/Honda). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor performance at higher altitudes
- Engine hesitation or stumbling
- Reduced fuel economy
- Hard starting
Probable Causes (Ranked by Likelihood)
- Faulty MAP or BARO sensor Very High
- Damaged wiring or connector at MAP/BARO sensor High
- Vacuum line to MAP sensor cracked or disconnected Moderate
- PCM/ECM fault Low
- Clogged MAP sensor port Low
Step-by-Step Diagnostic Procedure
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Check MAP sensor vacuum line for cracks, kinks, or disconnections
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Test MAP sensor voltage output -- should change with vacuum applied
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Inspect the wiring and connector at the MAP/BARO sensor
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Verify the MAP sensor port is clean and not clogged
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Compare MAP sensor readings to a known-good barometric pressure
Frequently Asked Questions
Can I drive with code P1105?
You can drive short distances, but the engine may run poorly, especially at higher altitudes. The PCM uses barometric pressure data to adjust fuel delivery and timing.
What causes P1105?
A faulty MAP or BARO sensor is the most common cause. Vacuum line issues and wiring problems are also frequent. On Honda vehicles, this code relates to the barometric pressure circuit.
Is P1105 expensive to fix?
No. MAP/BARO sensors are relatively inexpensive at $30 to $100 for the part. Vacuum line repairs are even cheaper. Total repair costs typically range from $50 to $300.