OBD Guide
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P15AC

Engine Mounting Control Module Internal Circuit Malfunction

P15AC is an OBD-II diagnostic trouble code meaning: Engine Mounting Control Module Internal Circuit Malfunction. Common causes: internal short circuit in the module, module power supply circuit open. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Increased engine vibrations
  • Rattling sounds from the engine compartment
  • Check engine light comes on
  • Deterioration in smoothness
  • Errors in the engine control system

Causes

  • Internal short circuit in the module
  • Module power supply circuit open
  • Connector pin corrosion
  • Wiring harness damage
  • Active engine mount malfunction

How to Fix

  1. Check module fuses and relays
  2. Inspect connectors and wiring for damage
  3. Test the power supply and ground of the module
  4. Check control circuit resistance
  5. Replace engine mount control module if necessary

Related codes

P15ABP15ADP15AE

FAQ

What does the P15AC code mean?

P15AC is an OBD-II diagnostic trouble code that indicates: Engine Mounting Control Module Internal Circuit Malfunction

What causes a P15AC error code?

The most common causes of P15AC include: Internal short circuit in the module; Module power supply circuit open; Connector pin corrosion; Wiring harness damage.

How do I fix a P15AC diagnostic trouble code?

To fix P15AC: Check module fuses and relays. Inspect connectors and wiring for damage. Test the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P15AC?

Yes, but get it checked soon

How much does it cost to fix P15AC?

The estimated repair cost for P15AC is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat