PRE-RELEASE
DTC C0550
| DTC C0550 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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 |
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A current DTC clears when the malfunction is no longer present.
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A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
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| Diagnostic Aids |
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This DTC may be stored as a history DTC without affecting the operation of the module.
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If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
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If this DTC is retrieved as both a current and history DTC, replace the module that set the DTC.
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| 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.
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| 2. |
If any of these DTCs has been generated, see
Diagnostic Trouble Code (DTC) List - Vehicle
.
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| 3. |
Verify that DTC C0550 has not been generated.
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| 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.
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| 5. |
If the DTC was generated with other symptom bytes, replace the control module that generated the DTC.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for module replacement, setup, and programming
