OBD Guide
ENFRDEESPT

P1299

Cylinder Head Overtemperature Protection Active

P1299 is an OBD-II diagnostic trouble code meaning: Cylinder Head Overtemperature Protection Active. Common causes: low coolant level, thermostat malfunction. Estimated repair cost: $6–111.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–111 (est.)

Symptoms

  • Reduced engine power
  • Engine overheating
  • CHECK ENGINE indicator is on
  • Possible steam from under the hood
  • Unstable engine operation

Causes

  • Low coolant level
  • Thermostat malfunction
  • Jammed cooling system pump
  • Clogged radiator
  • Cylinder head temperature sensor malfunction

How to Fix

  1. Check the level and condition of the coolant
  2. Diagnose the operation of the thermostat and pump
  3. Flush the cooling system
  4. Check the radiator and cooling fan
  5. Replace the cylinder head temperature sensor if necessary

Related codes

P1298P1285P1288

Error P1299 by Vehicle Brand

DodgeFordJeepLincolnMercuryPlymouthPontiac

FAQ

What does the P1299 code mean?

P1299 is an OBD-II diagnostic trouble code that indicates: Cylinder Head Overtemperature Protection Active

What causes a P1299 error code?

The most common causes of P1299 include: Low coolant level; Thermostat malfunction; Jammed cooling system pump; Clogged radiator.

How do I fix a P1299 diagnostic trouble code?

To fix P1299: Check the level and condition of the coolant. Diagnose the operation of the thermostat and pump. Flush the cooling system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1299?

Do not drive — repair immediately

How much does it cost to fix P1299?

The estimated repair cost for P1299 is $6–111. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat