OBD Guide
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P15D4

Coolant Pump Dry Run

P15D4 is an OBD-II diagnostic trouble code meaning: Coolant Pump Dry Run. Common causes: coolant leak, coolant pump malfunction. Estimated repair cost: $22–89.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–89 (est.)

Symptoms

  • Engine overheating
  • Coolant pump noise
  • Loss of coolant
  • The temperature indicator lights up
  • Reduced engine performance

Causes

  • Coolant leak
  • Coolant pump malfunction
  • Clogged radiator
  • Thermostat malfunction
  • Problems with the pump electrical circuit

How to Fix

  1. Check coolant level
  2. Inspect the pump for leaks
  3. Check thermostat operation
  4. Diagnose the electrical circuit of the pump
  5. Replace the coolant pump if necessary

Related codes

P15D3P15D5

FAQ

What does the P15D4 code mean?

P15D4 is an OBD-II diagnostic trouble code that indicates: Coolant Pump Dry Run

What causes a P15D4 error code?

The most common causes of P15D4 include: Coolant leak; Coolant pump malfunction; Clogged radiator; Thermostat malfunction.

How do I fix a P15D4 diagnostic trouble code?

To fix P15D4: Check coolant level. Inspect the pump for leaks. Check thermostat operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P15D4?

Do not drive — repair immediately

How much does it cost to fix P15D4?

The estimated repair cost for P15D4 is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat