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DTC 15

DTC 15

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC 15

Operation Lock - Heater Overheated More than 10 Times

Circuit/System Description

The parking heater controller monitors the coolant temperature to ensure that the temperature stays within the proper range. If the overtemperature sensor detects temperature greater than 125°C (257°F), it will turn off the controller.

Conditions for Running the DTC

The vehicle must not be ON. Battery voltage must be between 10-15 V.

Conditions for Setting the DTC

The parking heater controller detects that the heater has overheated more than 10 times.

Action Taken When the DTC Sets

The parking heater will lock.

Conditions for Clearing the DTC

DTC must be cleared with the remote control.

Diagnostic Aids

Check for proper operation of the heater coolant pump and water flow through the engine cooling system.

Reference Information

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel Operated Heater Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Circuit/System Verification

Ignition OFF, command the parking heater ON and OFF with the remote control. Verify the parking heater turns ON and OFF with no DTCs.

Circuit/System Testing


1. Ignition OFF, clear all DTCs.

2. Ensure that the DTC does not reset.

3. If the DTC does reset, replace the K87 Parking Heater Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.