MAP Sensor Circuit Intermittent High Voltage (GM)
What does P1106 mean?
The P1106 code means the vehicle's onboard diagnostic system has detected: MAP Sensor Circuit Intermittent High Voltage (GM). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Engine hesitation or stumbling
- Poor fuel economy
- Rough idle
- Black smoke from exhaust
Probable Causes (Ranked by Likelihood)
- Faulty MAP sensor Very High
- Damaged or corroded MAP sensor connector High
- Short or open in MAP sensor wiring Moderate
- Vacuum leak at MAP sensor hose Moderate
- Faulty ECM/PCM Low
Step-by-Step Diagnostic Procedure
-
Read freeze frame data to identify conditions when the code set
-
Inspect MAP sensor connector for corrosion, bent pins, or loose fit
-
Check MAP sensor vacuum hose for cracks, kinks, or disconnection
-
Test MAP sensor voltage output with a scan tool at idle and under load
-
Wiggle test the MAP sensor wiring harness while monitoring live data
Frequently Asked Questions
Can I drive with code P1106?
You can drive short distances, but the engine may run rich, hesitate, or stall. The intermittent nature of this code means symptoms may come and go.
What is the MAP sensor?
The Manifold Absolute Pressure (MAP) sensor measures intake manifold vacuum to help the ECM calculate fuel delivery and ignition timing. When it sends intermittent high voltage signals, the engine runs poorly.
How do I fix P1106?
Start by inspecting the MAP sensor connector and vacuum hose. If those are fine, test the sensor output with a scan tool. Most often, replacing the MAP sensor resolves this code on GM vehicles.