OBD Guide
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P15A4

AJC Compressor Driver Relay Stays Activated

P15A4 is an OBD-II diagnostic trouble code meaning: AJC Compressor Driver Relay Stays Activated. Common causes: faulty ajc compressor relay, 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

  • Constant operation of the suspension compressor
  • Increased fuel consumption
  • Compressor overheating
  • Uneven suspension performance
  • Error message on the dashboard

Causes

  • Faulty AJC compressor relay
  • Short circuit in control circuit
  • Suspension module software error
  • Mechanical stuck relay
  • Damage to the wiring to the relay

How to Fix

  1. Check the functionality of the AJC compressor relay
  2. Diagnose the relay control circuit for a short circuit
  3. Scan the suspension control module for errors
  4. Check the condition of the wiring and connectors
  5. Update control module software if necessary
  6. Repair only from an authorized dealer

Related codes

P15A1P15A2P15A3

FAQ

What does the P15A4 code mean?

P15A4 is an OBD-II diagnostic trouble code that indicates: AJC Compressor Driver Relay Stays Activated

What causes a P15A4 error code?

The most common causes of P15A4 include: Faulty AJC compressor relay; Short circuit in control circuit; Suspension module software error; Mechanical stuck relay.

How do I fix a P15A4 diagnostic trouble code?

To fix P15A4: Check the functionality of the AJC compressor relay. Diagnose the relay control circuit for a short circuit. Scan the suspension control module for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P15A4?

Yes, but get it checked soon

How much does it cost to fix P15A4?

The estimated repair cost for P15A4 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat