OBD Guide
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P103D

Engine Coolant Pump Control Signal Message Counter Incorrect

P103D is an OBD-II diagnostic trouble code meaning: Engine Coolant Pump Control Signal Message Counter Incorrect. Common causes: coolant pump malfunction, problems in the pump electrical circuit. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine overheating
  • Unstable engine operation
  • Check Engine Light Is On
  • Reduced engine power

Causes

  • Coolant pump malfunction
  • Problems in the pump electrical circuit
  • Engine control unit (ECU) malfunction
  • Poor contact in connectors

How to Fix

  1. Check the coolant pump for faults
  2. Check the electrical circuit of the pump
  3. Check connectors and connections
  4. Update ECU software if necessary

Related codes

P103CP103EP103F

FAQ

What does the P103D code mean?

P103D is an OBD-II diagnostic trouble code that indicates: Engine Coolant Pump Control Signal Message Counter Incorrect

What causes a P103D error code?

The most common causes of P103D include: Coolant pump malfunction; Problems in the pump electrical circuit; Engine control unit (ECU) malfunction; Poor contact in connectors.

How do I fix a P103D diagnostic trouble code?

To fix P103D: Check the coolant pump for faults. Check the electrical circuit of the pump. Check connectors and connections. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P103D?

Limited driving only, diagnose soon

How much does it cost to fix P103D?

The estimated repair cost for P103D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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