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DTC C0550

DTC C0550

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 Descriptors

DTC C0550 00

Electronic Control Module

DTC C0550 35

Electronic Control Module - ROM Malfunction

DTC C0550 39

Electronic Control Module - Internal Fault

DTC C0550 43

Electronic Control Module - EEPROM Incorrectly Programmed

Circuit/System Description

The internal fault detection is handled inside the control module. The symptom byte listed in the DTC Descriptor is for engineering reference only. No external circuit diagnosis is involved.

Conditions for Running the DTC

The module runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

Conditions for Setting the DTC

The module has detected an internal malfunction.

Action Taken When the DTC Sets

The module refuses all additional inputs.

Conditions for Clearing the DTC


• A current DTC clears when the malfunction is no longer present.

• A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.


Diagnostic Aids


• This DTC may be stored as a history DTC without affecting the operation of the module.

• If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.

• If this DTC is retrieved as both a current and history DTC, replace the module that set the DTC.


Circuit/System Verification


1. Verify that none of the following DTCs have been generated: B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560 or P0562.

2. If any of these DTCs has been generated, see Diagnostic Trouble Code (DTC) List - Vehicle .

3. Verify that DTC C0550 has not been generated.

4. If the DTC was generated with symptom byte 39 or 43, program the control module that generated the DTC. If the DTC resets, replace the control module.

5. If the DTC was generated with other symptom bytes, replace the control module that generated the DTC.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for module replacement, setup, and programming