OBD Guide
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P157D

Idle Throttle Valve Actuator 2

P157D is an OBD-II diagnostic trouble code meaning: Idle Throttle Valve Actuator 2. Common causes: dirty or jammed idle mechanism, open or short circuit in control circuit. Estimated repair cost: $28–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$28–89 (est.)

Symptoms

  • Unstable idle speed
  • Floating engine speed
  • Difficulty starting the engine
  • Reduced engine power
  • Check Engine Light Illuminates

Causes

  • Dirty or jammed idle mechanism
  • Open or short circuit in control circuit
  • Actuator motor malfunction
  • Problems with power or grounding of the circuit
  • Failures in the control unit software

How to Fix

  1. Check the condition of the idle mechanism for contamination
  2. Check the integrity of the wiring harness and connectors
  3. Measure the resistance and power supply of the electric motor
  4. Reset throttle adaptations
  5. If necessary, replace the actuator

Related codes

P1579P157AP157E

FAQ

What does the P157D code mean?

P157D is an OBD-II diagnostic trouble code that indicates: Idle Throttle Valve Actuator 2

What causes a P157D error code?

The most common causes of P157D include: Dirty or jammed idle mechanism; Open or short circuit in control circuit; Actuator motor malfunction; Problems with power or grounding of the circuit.

How do I fix a P157D diagnostic trouble code?

To fix P157D: Check the condition of the idle mechanism for contamination. Check the integrity of the wiring harness and connectors. Measure the resistance and power supply of the electric motor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P157D?

Yes, but get it checked soon

How much does it cost to fix P157D?

The estimated repair cost for P157D is $28–89. Actual cost depends on your vehicle, location, and labor rates.

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