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P1106

MAP Sensor Circuit Intermittent High Voltage.

  • Oldsmobile
  • 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 an Oldsmobile means the engine control module saw the Manifold Absolute Pressure (MAP) sensor signal go intermittently too high, which equates to a pressure reading far above what the engine conditions should produce. The fault comes and goes, so it usually points to a poor connection, a wiring fault or a sensor that is failing at times.

Symptoms

  • Check engine light on, sometimes going out again
  • Hesitation or stumbling under acceleration
  • Rich running with black smoke or a fuel smell
  • Rough or unstable idle
  • Poor fuel economy
  • Hard starting or occasional stalling

Possible causes

  • Loose, corroded or damaged connector at the MAP sensorlikely
  • Intermittent short to voltage or chafed wiring on the MAP signal circuitlikely
  • Failing MAP sensor with an intermittent internal faultlikely
  • Open or poor connection on the sensor ground or 5 V reference circuitpossible
  • Cracked, blocked or disconnected vacuum hose to the MAP sensor, where fittedpossible
  • Poor connection at the engine control module connector or an internal module faultrare

How to diagnose

  1. Read the stored and pending codes and note the freeze frame data, including engine load, speed and MAP reading when the fault set.
  2. Check for other related codes, such as other sensor reference voltage faults, which would suggest a shared circuit problem.
  3. Inspect the MAP sensor connector and wiring for corrosion, bent or pushed-back pins, chafing, and heat or oil damage.
  4. With the key on and engine off, watch the live MAP reading, which should be close to ambient pressure, and wiggle the harness and connector to see if the reading jumps.
  5. Check the vacuum hose to the sensor, where fitted, and the sensor seal for cracks, blockage or leaks.
  6. Check the 5 V reference, signal and ground at the sensor connector against the wiring diagram for your model and engine.
  7. Compare the MAP reading with a known good vacuum or pressure reading at idle and with the engine off, since the correct values depend on engine and altitude.
  8. Test the harness for continuity and shorts between the sensor and the control module, with the module disconnected.

How to fix

  • Clean, repair or replace the damaged MAP sensor connector or terminals.
  • Repair or replace chafed or shorted wiring on the signal, reference or ground circuit.
  • Replace the MAP sensor if it gives an erratic reading when tested.
  • Replace cracked or blocked vacuum hoses and refit any loose sensor seal.
  • Repair the control module connector or, only after all else is proven good, replace or repair the module.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but rich running and hesitation can worsen fuel economy and may harm the catalytic converter if it continues. Get it checked soon and avoid heavy loads until it is fixed.

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

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