Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTC U1601-00-ECU APPLICATION SOFTWARE CODE 1 MISSING OR CORRUPTED
NOTE:
This DTC must be active for the results of this test to be valid. Check for a loose scan tool connection. Verify battery charger is installed and charge rate provides approximately 13.5 volts.
1. Ignition on, engine off.
2. With the scan tool, read the DTCs.
3. With the scan tool, follow the reprogramming procedure and reflash the Integrated Trailer Brake Module (ITBM) while maintaining voltage as noted above.
4. With the scan tool, read the DTCs.
  Does the scan tool display: U1601-ECU APPLICATION SOFTWARE CODE 1 MISSING OR CORRUPTED?
  
  Yes
  - Replace the Integrated Trailer Brake Module (ITBM) in accordance with the Service Information.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
  No
  - The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.