OBD Guide
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P1505

Idle Speed Control Actuator Signal Low

P1505 is an OBD-II diagnostic trouble code meaning: Idle Speed Control Actuator Signal Low. Common causes: idle air control malfunction, open or short circuit in control circuit. 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 stalls at idle
  • Floating speed
  • Problems starting the engine
  • Check Engine light comes on

Causes

  • Idle air control malfunction
  • Open or short circuit in control circuit
  • Poor contact in connectors
  • Regulator or throttle valve dirty
  • Engine control unit malfunction

How to Fix

  1. Check the condition of the idle air control
  2. Check the integrity of the control circuit and connections
  3. Clean idle air control and throttle valve
  4. Check the operation of the engine control unit
  5. Replace idle air control if necessary

Related codes

P1506P1507P1508

Error P1505 by Vehicle Brand

BMWFordKiaLincolnMercuryVolkswagen

FAQ

What does the P1505 code mean?

P1505 is an OBD-II diagnostic trouble code that indicates: Idle Speed Control Actuator Signal Low

What causes a P1505 error code?

The most common causes of P1505 include: Idle air control malfunction; Open or short circuit in control circuit; Poor contact in connectors; Regulator or throttle valve dirty.

How do I fix a P1505 diagnostic trouble code?

To fix P1505: Check the condition of the idle air control. Check the integrity of the control circuit and connections. Clean idle air control and throttle valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1505?

Yes, but get it checked soon

How much does it cost to fix P1505?

The estimated repair cost for P1505 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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