OBD Guide
ENFRDEESPT

P103E

Auxiliary Coolant Pump Control Signal Message Counter Incorrect

P103E is an OBD-II diagnostic trouble code meaning: Auxiliary Coolant Pump Control Signal Message Counter Incorrect. Common causes: auxiliary coolant pump malfunction, problems in the pump control circuit. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Engine overheating
  • Unstable operation of the cooling system
  • Check Engine light comes on
  • Reduced cooling efficiency

Causes

  • Auxiliary coolant pump malfunction
  • Problems in the pump control circuit
  • Wiring harness damage
  • ECU malfunction
  • Poor contact in connectors

How to Fix

  1. Check the operation of the auxiliary coolant pump
  2. Check the integrity of the pump control circuit
  3. Inspect the wiring harness and connectors for damage.
  4. Check the serviceability of the ECU
  5. Replace faulty components

Related codes

P103DP103F

FAQ

What does the P103E code mean?

P103E is an OBD-II diagnostic trouble code that indicates: Auxiliary Coolant Pump Control Signal Message Counter Incorrect

What causes a P103E error code?

The most common causes of P103E include: Auxiliary coolant pump malfunction; Problems in the pump control circuit; Wiring harness damage; ECU malfunction.

How do I fix a P103E diagnostic trouble code?

To fix P103E: Check the operation of the auxiliary coolant pump. Check the integrity of the pump control circuit. Inspect the wiring harness and connectors for damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P103E?

Limited driving only, diagnose soon

How much does it cost to fix P103E?

The estimated repair cost for P103E is $33–111. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat