Skip to content
GTECH Calibration
Portal

P1106

BARO Circuit Range Performance Malfunction.

  • Acura
  • 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

On Acura, P1106 means the engine control unit has judged the barometric pressure (BARO) signal to be out of range or not plausible. It typically compares the BARO reading with the manifold pressure reading at key-on or under certain conditions, and sets the code when they disagree or the value is outside what is expected for the altitude. The exact sensor arrangement (separate BARO sensor or one built into the control unit) depends on the model and year.

Symptoms

  • Malfunction indicator lamp on
  • Poor or uneven running, particularly at altitude or on load
  • Hesitation or reduced power
  • Rough idle or occasional stalling
  • Poor fuel economy

Possible causes

  • Faulty or drifting BARO or MAP sensor giving an implausible readinglikely
  • Damaged wiring, poor connector contact or corrosion in the sensor circuit (signal, reference voltage or earth)likely
  • Blocked, split or disconnected vacuum hose or air leak affecting the pressure readingpossible
  • Restricted air intake or blocked air filter distorting manifold pressure readingspossible
  • Poor earth or low reference voltage supply to the sensorspossible
  • Fault inside the engine control unit (where BARO sensor is built in)rare

How to diagnose

  1. Read the stored codes and freeze frame data, noting engine speed, load and temperature when the code set, and check for other MAP, throttle or reference voltage codes.
  2. Visually inspect the sensor wiring, connectors and vacuum hoses for damage, corrosion, chafing, splits or loose fittings.
  3. With the ignition on and engine off, compare the live BARO and MAP readings; both should be close to local atmospheric pressure and to each other.
  4. Check the readings against the expected value for your altitude and weather conditions, and see if they change as expected with throttle opening or at idle.
  5. Check the sensor reference voltage, signal and earth at the connector with a multimeter against the workshop manual values for the model.
  6. Wiggle-test the harness and connector with the engine running to look for intermittent changes in the reading.
  7. Inspect the air filter and intake path for restrictions or leaks, and check for induction air leaks.
  8. Where the sensor is separate, swap or substitute it with a known good unit only after wiring and supply checks pass; the procedure depends on the model.

How to fix

  • Replace the BARO or MAP sensor if its readings are out of range or do not match the other sensor.
  • Repair or replace damaged wiring, and clean or replace corroded or loose connectors.
  • Replace or refit cracked, blocked or disconnected vacuum hoses and seal any induction leaks.
  • Replace a blocked air filter and clear any intake restriction.
  • Repair earth or reference voltage supply faults found during testing.
  • If all else tests fine, have the control unit checked and repaired or replaced following the manufacturer's procedure.

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but fault-finding should be done soon as running quality and economy may suffer. Avoid heavy load or long journeys if it hesitates, stalls or runs poorly.

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

This code for other makes

Nearby codes