Acura P1151: Acura OBD-II Error Code P1151

Symptoms

The ECM has detected a manufacturer-specific vehicle speed or idle control fault. The engine may stall at idle or the speedometer may be inaccurate. DTC P1151 is stored in the Acura engine control module.

Possible Causes

Idle air control valve fault
Throttle body position sensor fault
Vehicle speed sensor signal fault
Cruise control input fault

Troubleshooting Steps

Step 1: Connect an OBD-II scanner and read DTCs to confirm P1151
DTC P1151 present with freeze frame data
Step 2: Inspect wiring and connectors in the affected circuit for damage, corrosion, or loose pins
Wiring intact, connectors clean and seated
Step 3: Perform component-level testing per manufacturer service manual
Component values within spec or component confirmed faulty
Step 4: Repair or replace the faulty component, clear DTC, and verify no return
DTC cleared and does not return after a road test

How to Reset

Clear the DTC after repair using a diagnostic scanner. The code clears automatically if the fault is not detected for 3 consecutive drive cycles.

Common Replacement Parts

varies: Diagnose and replace the confirmed faulty component (Confirm part number via VIN at a Acura dealership)

Frequently Asked Questions

Q: What does P1151 mean?
This manufacturer-specific DTC indicates a vehicle speed / idle control system fault. Refer to the vehicle's service manual for the exact diagnostic procedure.
Q: Can I drive with P1151?
Limited driving is possible, but the affected system may not operate correctly. Have the vehicle diagnosed promptly to prevent potential damage.

Acura OBD-II Error Code P1151