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DTC C056D

DTC C056D

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 C056D 00

Electronic Control Module, Hardware

DTC C056D 0F

Signal Disturbances in Electronic Control Module Components

DTC C056D 18

Electronic Control Module Components, Low Signal Amplitude

DTC C056D 31

Electronic Control Module Components, Internal Checksum Error

DTC C056D 32

Electronic Control Module Components, General Memory Error

DTC C056D 33

Electronic Control Module Components, Special Memory Error

DTC C056D 34

Electronic Control Module, Machine Performance, RAM Error

DTC C056D 35

Electronic Control Module, Hardware Performance, ROM Error

DTC C056D 36

Electronic Control Module, Machine Performance, EEPROM Error

DTC C056D 37

Electronic Control Module Components, Malfunction

DTC C056D 39

Internal Component Fault Detected

DTC C056D 3A

Electronic Control Module Components Incorrectly Installed

DTC C056D 3B

Electronic Control Module Components, Self-Test Malfunction

DTC C056D 3C

Electronic Control Module Components, Internal Malfunction

DTC C056D 43

Electronic Control Module Components, 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 DTC C056D is not set.

2. If the DTC is set in a control module that can be programmed, program the control module. If the DTC resets, replace the control module that set the DTC.

3. If the DTC is set in a control module that can not be programmed, replace the control module that set the DTC.

4. If the DTC is set in a sensor, replace the sensor that set the DTC.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, programming and setup