OBD Guide
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P156F

Idle Throttle Valve Actuator 1 Open Circuit

P156F is an OBD-II diagnostic trouble code meaning: Idle Throttle Valve Actuator 1 Open Circuit. Common causes: open or short circuit in control circuit, throttle actuator malfunction. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable idle speed
  • Engine stalls at idle
  • Check Engine light comes on
  • Dips when pressing the gas pedal
  • Increased fuel consumption

Causes

  • Open or short circuit in control circuit
  • Throttle actuator malfunction
  • Problems with the engine control unit
  • Oxidation of contacts in connectors
  • Mechanical damage to the throttle valve

How to Fix

  1. Check the integrity of wiring and connectors
  2. Test control circuit resistance
  3. Inspect the throttle valve actuator
  4. Check the operation of the engine control unit
  5. Replace damaged components if necessary

Related codes

P156EP1570P1571

FAQ

What does the P156F code mean?

P156F is an OBD-II diagnostic trouble code that indicates: Idle Throttle Valve Actuator 1 Open Circuit

What causes a P156F error code?

The most common causes of P156F include: Open or short circuit in control circuit; Throttle actuator malfunction; Problems with the engine control unit; Oxidation of contacts in connectors.

How do I fix a P156F diagnostic trouble code?

To fix P156F: Check the integrity of wiring and connectors. Test control circuit resistance. Inspect the throttle valve actuator. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P156F?

Yes, but get it checked soon

How much does it cost to fix P156F?

The estimated repair cost for P156F is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat