What does it mean?
P1106 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: MAP Sensor Circuit High Input (Intermittent) .
Symptoms
- Check engine light that comes and goes over several trips
- Occasional stumble, surge or hesitation while driving at a steady throttle
- Rich running with black smoke or a strong fuel smell during the fault
- Rough idle and, in some cases, stalling when the engine returns to idle
- Fuel consumption noticeably higher than usual
- Hard starting when the fault is present at cranking
Likely causes
- Loose, cracked or disconnected vacuum hose to the sensor, which lets it read close to atmospheric pressure
- Intermittent open in the sensor ground circuit, letting the signal rise
- Signal wire touching the 5 V reference through a rubbed spot in the loom
- Moisture or corrosion in the connector that only breaks contact with vibration or temperature
- Sensor with an internal fault that spikes when hot
- Blocked or partly restricted manifold port giving unstable readings
- Poor module ground affecting several sensor circuits at once
How to fix it
- Graph the MAP value in live data during a road test and look for spikes that do not match throttle movement
- With the ignition on and the engine stopped, compare the MAP value against barometric pressure; the two should read almost the same
- Inspect the vacuum hose and the manifold port for cracks, softening, oil and blockage
- Wiggle the connector and loom with the engine idling while watching the value to reproduce the spike
- Check the 5 V reference and the sensor ground at the connector, using a voltage-drop test for the ground
- Clean corroded terminals and reseal the connector if moisture is present
- Replace the sensor if the signal spikes with good supply, ground and vacuum, then confirm stable readings on a test drive