Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test Cd: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0554:00 Invalid Data Received From The Accessory Protocol Interface Module
Refer to Wiring Diagrams POWER STEERING CONTROLS for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Power Steering - System Operation and Component Description .
Description
- The PSCM monitors the HS-CAN when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
Pinpoint Test Applicability
- This test applies to PSCMDTC U0554 Invalid Data Received from the APIM only. It does not apply to any other module except the PSCM.
DTC Diagnostic Strategy
- If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).
Pinpoint Test Purpose
- To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.
Diagnostic Aids
- For additional information on the messages sent to the PSCM from the APIM module, refer to the Network Message List in DESCRIPTION AND OPERATION .
- DTC U0554:00 indicates a concern with the lane information sent from the APIM. The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCMDTC U0554:00.
- The presence of DTC U0554:00 may prevent the trailer backup optional feature from activating. If the DTC sets during an backup event, the event may be terminated and the feature may be deactivated.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PSCM U0554:00 | Invalid Data Received From Accessory Protocol Interface Module: No Sub Type Information | This DTC is set if the PSCM receives an "fault" or "unknown" message from the APIM instead of valid information. |
Possible Sources
- HS-CAN concern
- APIM
- This DTC sets when the PSCM does not receive the APIM messages within a certain time frame. This can occur if the APIM wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.