Heater Overheated

Test 1 - 3:

Test 4 - 5:

SYMPTOM
HEATER OVERHEATED

TEST NOTE
This symptom is diagnosed using the test HEATER IN LOCKOUT MODE.

WHEN MONITORED
After heater activation, when the system is in a steady state of operation.

SET CONDITION
This DTC will set if the Temperature Sensor's resistance or Overheating Sensor's resistance is not within the expected parameters (coolant temperature in the heater module exceeds 105°C (221°F).

POSSIBLE CAUSES
- Cabin heater assembly or heater booster assembly
- Heater's coolant hoses restricted/leaking/damaged
- Engine's cooling system fault
- Cabin heater or heater booster control unit
- Heater overheated/successive overheating cleared, additional DTC(s) present