OBD Guide
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P10D4

Cold Start Engine Coolant Temperature Too Low

P10D4 is an OBD-II diagnostic trouble code meaning: Cold Start Engine Coolant Temperature Too Low. Common causes: coolant temperature sensor malfunction, thermostat stuck open. Estimated repair cost: $6–33.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Increased fuel consumption
  • Unstable engine idling
  • Long engine warm-up
  • Reduced engine power
  • Check Engine Light Illuminates

Causes

  • Coolant temperature sensor malfunction
  • Thermostat stuck open
  • Low coolant level
  • Problems with wiring to the temperature sensor
  • Engine control unit malfunction

How to Fix

  1. Check coolant level
  2. Check thermostat operation
  3. Check coolant temperature sensor
  4. Check the integrity of the wiring to the sensor
  5. Scan the ECU for other errors

Related codes

P0115P0116P0117

FAQ

What does the P10D4 code mean?

P10D4 is an OBD-II diagnostic trouble code that indicates: Cold Start Engine Coolant Temperature Too Low

What causes a P10D4 error code?

The most common causes of P10D4 include: Coolant temperature sensor malfunction; Thermostat stuck open; Low coolant level; Problems with wiring to the temperature sensor.

How do I fix a P10D4 diagnostic trouble code?

To fix P10D4: Check coolant level. Check thermostat operation. Check coolant temperature sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P10D4?

Yes, but get it checked soon

How much does it cost to fix P10D4?

The estimated repair cost for P10D4 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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