P156D
Idle Throttle Valve Actuator 1 Short To Ground
P156D is an OBD-II diagnostic trouble code meaning: Idle Throttle Valve Actuator 1 Short To Ground. Common causes: damage to the wiring harness to the throttle actuator, short circuit in the throttle valve actuator itself. Estimated repair cost: $33–167.
Symptoms
- Unstable engine idling
- Reduced engine power
- Check Engine light comes on
- The engine may stall at idle
- Dips when pressing the gas pedal
Causes
- Damage to the wiring harness to the throttle actuator
- Short circuit in the throttle valve actuator itself
- Problems with contacts in connectors
- Engine control unit malfunction
- Corrosion or oxidation of contacts
How to Fix
- Check the integrity of the wiring harness to the throttle valve
- Inspect connectors for oxidation or damage
- Check the resistance of the throttle valve actuator
- Scan the engine control module for other errors
- If necessary, replace the throttle valve actuator
Related codes
FAQ
What does the P156D code mean?
P156D is an OBD-II diagnostic trouble code that indicates: Idle Throttle Valve Actuator 1 Short To Ground
What causes a P156D error code?
The most common causes of P156D include: Damage to the wiring harness to the throttle actuator; Short circuit in the throttle valve actuator itself; Problems with contacts in connectors; Engine control unit malfunction.
How do I fix a P156D diagnostic trouble code?
To fix P156D: Check the integrity of the wiring harness to the throttle valve. Inspect connectors for oxidation or damage. Check the resistance of the throttle valve actuator. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P156D?
Limited driving only, diagnose soon
How much does it cost to fix P156D?
The estimated repair cost for P156D is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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