U0401

U0401 - Implausible Data Received from Engine Control Module/Powertrain Control Module

For a complete wiring diagram, refer to.

• When Monitored: Continuously with the ignition ON, one valid CAN message received at least once, and no U0002-CAN C Bus off Performance DTC present.

• Set Condition: When the anti lock brake module detects an incorrect CAN message from the engine control module.






Test Step 1 - Test for DTC U0401 - Implausible Data Received from ECM/PCM

• This DTC must be active for the results of this test to be valid.

• Turn the ignition ON.

• With the scan tool, record and erase DTCs.

• Cycle the ignition switch from OFF to ON.

• With the scan tool, read DTCs.

Does the scan tool display U0401 - Implausible Data Received from ECM/PCM?

Yes

• Go to Test Step 2 => [ Test Step 2 - Test if TIPM Can Bus DTCs are Present ]

No

• Perform the ABS Intermittent Condition Test. Refer to => Non-DTC Based Diagnostics. ABS Intermittent Condition Test

Test Step 2 - Test if TIPM Can Bus DTCs are Present

• With the scan tool, read TIPM DTCs.

Are there any TIPM CAN Bus DTCs present?

Yes

• Refer to Electrical/Electronic Control Modules, refer to => Engine DTC-Based Diagnostics.

No

• Go to Test Step 3 => [ Test Step 3 - Test if Engine DTCs are Present ]

Test Step 3 - Test if Engine DTCs are Present

• With the scan tool, read Engine DTCs.

Are there any Engine DTCs present?

Yes

• Refer to the Engine Electrical Diagnostics, refer to => Engine DTC-Based Diagnostics.

No

• Using the schematics as a guide, test the anti lock brake module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the anti lock brake module.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test