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P1144

Air Assist Control Valve Circuit Malfunction.

  • Other
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
1
AreaFuel and air metering
44
FaultThe specific fault in that area

What it means

P1144 is a manufacturer-specific code that, under the definition supplied here, means Air Assist Control Valve Circuit Malfunction. The control unit saw a voltage or current in the valve's control circuit that did not match what it expected when it commanded the valve on or off. This points to an electrical fault in the circuit or valve, but the exact test conditions and what the valve does vary by make and engine. Other makers use P1144 for completely different faults, so confirm the definition for the exact vehicle before diagnosing.

Symptoms

  • Engine warning light on
  • Rough or unstable idle on some engines
  • Slight hesitation or poor cold-start running
  • Higher emissions or a failed emissions test
  • Possible poor fuel economy
  • No noticeable change in driveability in some cases

Possible causes

  • Faulty air assist control valve (solenoid coil open or shorted)likely
  • Damaged, chafed or corroded wiring to the valve (open circuit, short to earth or short to supply)likely
  • Loose, corroded or water-contaminated connector at the valve or control unitlikely
  • Blown fuse or faulty relay feeding the valve circuit, where fittedpossible
  • Blocked or leaking air assist hoses or passages affecting the valve's operationpossible
  • Fault in the control unit output driverrare

How to diagnose

  1. Confirm the code definition for this exact make, model and engine, then read all stored and pending codes and note any related faults.
  2. Read the freeze frame data to see engine temperature, load and speed when the fault set, then clear the code and see if it returns.
  3. Visually inspect the valve, its hoses, wiring harness and connectors for damage, heat, chafing, oil or water ingress.
  4. Check the relevant fuse and relay, where fitted, and the power and earth supply at the valve connector using the wiring diagram.
  5. Measure the valve solenoid resistance and compare it with the manufacturer's specification.
  6. Use a scan tool's active test, where available, to command the valve and listen for or feel it operating.
  7. Check the control wire for continuity and for shorts to earth or supply between the valve and the control unit.
  8. Inspect the air assist hoses and passages for blockages, splits or leaks.

How to fix

  • Replace the air assist control valve if its coil resistance is out of specification or it fails the operation test.
  • Repair or replace damaged wiring, and fix any short or open circuit found.
  • Clean, repair or replace corroded or loose connectors and terminals.
  • Replace a blown fuse only after finding why it blew, and replace a faulty relay.
  • Clear or replace blocked, split or leaking hoses and passages.
  • Have the control unit tested and repaired or replaced only after the wiring and valve have been proven good.

Can I keep driving?

Low severity

The car can normally be driven while you arrange a repair, as this is usually an emissions and driveability fault. If the engine runs badly or the warning light flashes, have it checked sooner.

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

This code for other makes

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