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P1106

Dual Alternator Lower Fault Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage.

  • Lincoln
  • 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 Lincoln means the powertrain control module saw the Manifold Absolute Pressure (MAP) sensor signal go intermittently high in voltage, higher than the engine conditions could explain. The wording also refers to a dual alternator lower fault, which only applies to models fitted with two alternators, so check which charging layout your vehicle has. The fault is intermittent, so it may come and go and may not be present when you test.

Symptoms

  • Engine warning light on
  • Rough or unstable idle
  • Hesitation or flat spots under acceleration
  • Occasional stalling or hard starting
  • Poor fuel economy
  • Charging system warning light or low battery voltage on dual alternator models

Possible causes

  • Loose, corroded or damaged connector at the MAP sensorlikely
  • Chafed, broken or intermittently shorted wiring in the MAP signal or reference circuit, or a poor sensor groundlikely
  • Failing MAP sensor giving spikes in its signallikely
  • Cracked, split or blocked vacuum hose or port feeding the MAP sensor, or an intake leakpossible
  • Charging system fault or voltage fluctuation affecting sensor reference voltage, on models with dual alternatorspossible
  • Poor power or ground connections to the powertrain control modulerare
  • Faulty powertrain control modulerare

How to diagnose

  1. Read all stored and pending codes and note any charging system or other sensor codes alongside P1106.
  2. Review freeze frame data for engine load, speed, MAP reading and battery voltage when the fault set.
  3. Inspect the MAP sensor, its connector and the wiring for damage, corrosion, water ingress or chafing, and check the vacuum hose and port for splits or blockages.
  4. With the ignition on and the engine off, compare live MAP reading with the local barometric pressure, then wiggle the connector and harness while watching for spikes.
  5. Using a multimeter, check the sensor 5 volt reference, signal and ground circuits for correct voltage, continuity and shorts to voltage, following the wiring diagram for your model and engine.
  6. Check for vacuum or intake leaks with the engine running and see whether MAP readings follow throttle changes smoothly.
  7. Test battery and charging voltage at idle and under load; on dual alternator models, check that both alternators are working, using the model-specific procedure.
  8. Only if wiring and the sensor test good, check the powertrain control module power and grounds before suspecting the module.

How to fix

  • Clean, secure or replace the MAP sensor connector and terminals.
  • Repair or replace damaged wiring, including any short to voltage, open circuit or poor ground.
  • Replace the MAP sensor if its signal is erratic or out of range.
  • Replace cracked or blocked vacuum hoses or seals and repair any intake leak.
  • Repair the charging system fault, such as a faulty alternator, wiring or battery, as found in testing.
  • Clear the codes and road test to confirm the fault does not return.

Can I keep driving?

Medium severity

Short, careful journeys are usually possible, but the engine may run poorly or stall without warning, so get it diagnosed soon. Avoid long trips or heavy loads until it is fixed, and stop if a charging warning appears or the engine becomes unstable.

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

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