P1299 Cylinder Head Overtemperature Protection Active

P1299 Cylinder Head Overtemperature Protection Active

Possible causes
  • Engine cooling system concerns.
  • Low engine coolant level.
  • Base engine concerns.
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1299 Description

    Indicates an engine overheat condition was detected by the cylinder head temperature (CHT) sensor. An FMEM strategy called Fail-safe Cooling was activated to cool the engine.