OBD Guide
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P156E

Idle Throttle Valve Actuator 1 Short To Positive

P156E is an OBD-II diagnostic trouble code meaning: Idle Throttle Valve Actuator 1 Short To Positive. Common causes: short circuit in the actuator circuit, malfunction of the idle speed actuator. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Unstable idle speed
  • Engine stalling at idle
  • Check Engine Light Illuminates
  • RPM dips when going to idle
  • Increased engine vibrations at idle

Causes

  • Short circuit in the actuator circuit
  • Malfunction of the idle speed actuator
  • Wiring harness damage
  • Problems with the engine control unit
  • Corrosion of contacts in the control circuit

How to Fix

  1. Check the integrity of the wiring harness to the actuator
  2. Measure actuator resistance
  3. Check control circuit voltage
  4. Replace the idle speed actuator if necessary
  5. Clean contacts and repair damaged wiring

Related codes

P156FP1570P156D

FAQ

What does the P156E code mean?

P156E is an OBD-II diagnostic trouble code that indicates: Idle Throttle Valve Actuator 1 Short To Positive

What causes a P156E error code?

The most common causes of P156E include: Short circuit in the actuator circuit; Malfunction of the idle speed actuator; Wiring harness damage; Problems with the engine control unit.

How do I fix a P156E diagnostic trouble code?

To fix P156E: Check the integrity of the wiring harness to the actuator. Measure actuator resistance. Check control circuit voltage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P156E?

Yes, but get it checked soon

How much does it cost to fix P156E?

The estimated repair cost for P156E is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat