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 M: Invalid Data Received From Another Module
- Refer to Wiring Diagrams MODULE COMMUNICATIONS NETWORK
for schematic and connector information.
Normal Operation and Fault Conditions
The GSM expects to receive network data from other modules on HS-CAN2. The GSM will set a DTC if it receives an invalid or incomplete message from another module. Incomplete or corrupted messages typically result from high network traffic preventing the complete message from being received within the calibrated time limit.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition GSM U0401: 00 Invalid Data Received from ECM/PCM A: No Sub Type Information This DTC indicates the GSM is receiving messages from the PCM, but the PCM is reporting faults in key signals. GSM U0422: 00 Invalid Data Received From Body Control Module: No Sub Type Information This DTC indicates the GSM is receiving messages from the BCM, but the BCM is reporting faults in key signals. Possible Sources
- High network traffic event
- Incorrect PMI
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
- Suspect module
- M1 CHECK THE SUSPECT MODULE FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, carry out the self-test on the suspect module.
Are any diagnostic trouble codes (DTCs) present in the suspect module?
Yes RESOLVE those diagnostic trouble codes first. REFER to the Master DTC Chart. No GO to M2 - M2 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.
- Using a diagnostic scan tool, clear all diagnostic trouble codes from the GSM.
- Road test the vehicle.
- Using a diagnostic scan tool, carry out the GSM self-test.
Did the invalid data DTC set again?
Yes GO to M3 No The system is operating correctly at this time. The concern may have been caused by a high network traffic event. - M3 CHECK FOR OTHER CAUSES OF COMMUNICATION CONCERNSNOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.
- CHECK the vehicle service history for recent service actions related to the suspect module or to the GSM. If recent service history is found:
- verify correct replacement module was installed
- HVBOM may be used to verify correct part application
- verify the configuration of replacement module was correct
- re-configure module using as-built data if prior configuration is suspect
- verify the module was not obtained from a like vehicle and installed into customer vehicle
- return the swapped module to source vehicle and obtain new replacement module
- verify correct replacement module was installed
Were any causes of a communication concern found in the vehicle service history?
Yes Follow the above directions to address improper module replacement or configuration. If the correct module was installed and the PMI was completed correctly, GO to M4 No GO to M4 - CHECK the vehicle service history for recent service actions related to the suspect module or to the GSM. If recent service history is found:
- M4 INSPECT ALL IN-LINE CAN (CONTROLLER AREA NETWORK) CONNECTORS
- Ignition OFF.
- Refer to Wiring Diagrams MODULE COMMUNICATIONS NETWORK for schematic and connector information. Disconnect all in-line CAN connectors between the GSM and the suspect module.
- Using a good light source, inspect all
disconnected electrical connectors for the following:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
Are any connector or pin issues present?
Yes REPAIR any connector or pin issues. No GO to M5 - M5 CHECK THE SUSPECT MODULE FOR CORRECT OPERATION
- Ignition OFF.
- Disconnect and inspect all suspect module connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Connect the suspect module connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM, or FSA. If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, INSTALL a new suspect module. For U0401, Refer to PCM GUIDED ROUTINE TESTING
Internet Explorer version 11 or greater is required to perform this Pinpoint Test.
After programming the new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download . For U0422, INSTALL a new BCM. REFER to: Body Control Module (BCM) .No The system is operating correctly at this time. The concern may have been caused by module or network connections. ADDRESS the root cause of any connector or pin issues.
NO RELATED
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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.