U1502 - Implausible Message Data Length Received From Transmission Control Module

For a complete wiring diagram, refer to appropriate Wiring Diagram.

• >>When Monitored:<< Continuously with the ignition ON.
• >>Set Condition:<< When the anti lock brake module detects an incorrect CAN message from the transmission control module.

Possible Causes
TIPM CAN BUS DTCs
TRANSMISSION DTCs
ANTI LOCK BRAKE MODULE

Test Step 1 - Test if TIPM CAN Bus DTCs are Present 

• With the scan tool, read TIPM DTCs.

Are there any TIPM CAN Bus DTCs present?

Yes

• Check Electrical/Electronic Control Modules diagnostics. Refer to DIAGNOSIS AND TESTING .

No

• Go to Test Step 2

Test Step 2 - Test if Transmission DTCs are Present 

• With the scan tool, read Transmission DTCs.

Are there any Transmission DTCs present?

Yes

• Check Transmission Electrical Diagnostics. Refer to TRANSMISSION DTC BASED DIAGNOSTICS (P0122 TO U0141) .

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 ABS VERIFICATION TEST (2009 - 2011) or ABS VERIFICATION TEST (2012 & UP) .