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P1106

MAP Sensor Circuit Intermittent High Voltage.

  • Buick
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
1
AreaFuel and air metering
06
FaultThe specific fault in that area

What it means

P1106 on a Buick means the powertrain control module has seen the manifold absolute pressure (MAP) sensor signal voltage go intermittently higher than expected, which would indicate much higher manifold pressure than the engine is really producing. The fault comes and goes, so it often points to a poor connection or a wiring problem rather than a sensor that has failed completely.

Symptoms

  • Check engine light on, possibly coming and going
  • Rough or unstable idle
  • Hesitation or stumbling under acceleration
  • Poor fuel economy or rich running with possible black smoke
  • Hard starting or occasional stalling
  • Intermittent loss of power

Possible causes

  • Loose, corroded or damaged connector at the MAP sensorlikely
  • Chafed, broken or intermittently shorting wiring in the MAP signal or 5 volt reference circuitlikely
  • Failing MAP sensor producing spikes in its outputlikely
  • Signal wire shorting to a voltage source, or a poor sensor ground connectionpossible
  • Split, loose or blocked vacuum hose or port feeding the MAP sensor, where one is fittedpossible
  • Fault inside the powertrain control module or its connectorrare

How to diagnose

  1. Read all stored and pending codes and record the freeze frame data to see engine load, speed and temperature when the fault set
  2. Check for related codes on the MAP sensor, throttle position or reference voltage circuits, as a shared fault points to a common wiring problem
  3. Inspect the MAP sensor connector and nearby wiring for corrosion, bent or pushed-back pins, heat damage and rubbing
  4. Wiggle the harness and connector with the engine idling while watching live MAP readings for sudden jumps
  5. Compare live MAP reading with key on engine off against local barometric pressure, and check it falls sensibly at idle
  6. Check the vacuum hose and port to the sensor for splits, blockage or fuel contamination, if the engine uses one
  7. Measure the 5 volt reference, signal and ground at the sensor connector and check for shorts to voltage, referring to the wiring diagram for your model and engine
  8. Check the powertrain control module connector for pin fit and corrosion before suspecting the module

How to fix

  • Repair or replace the damaged wiring and fix any short to voltage or poor ground found
  • Clean, re-seat or replace the corroded or loose sensor connector and terminals
  • Replace the MAP sensor if its output spikes or reads out of range
  • Replace split or blocked vacuum hoses and clear the sensor port
  • Repair or replace the powertrain control module only after all wiring and sensor causes have been ruled out, and check for any applicable software update for your model

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but the engine may run rich, hesitate or stall, so book it in soon. Avoid long trips and heavy loads until it is fixed, as poor running can cause further problems.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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