Diagnostic Test

1. Many transmission symptoms can be caused by a low fluid level. If the fluid level is low, locate and repair any leaks and fill the transmission to the proper fluid level. Refer to the Appropriate Service Information for the proper repair and fluid fill procedures.
2. Testing should only be performed with the battery fully charged to avoid false diagnosis.
3. With the scan tool, read Engine (PCM) DTCs. If Engine DTCs are present, perform to the appropriate diagnostic procedure(s) before proceeding. Refer to 6.7L DIESEL - DIAGNOSTIC CODE INDEX - 2500 & 3500 or 6.7L DIESEL - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS, 4500 & 5500 and perform the appropriate diagnostic procedure.
4. With the scan tool, read Transmission (TCM) DTCs. Record all Stored, Active, and Pending DTC information. Diagnose any Pending DTC as a matured DTC.
5. Refer to the When Monitored and Set Conditions for this DTC. DTCs can set at ignition on, at start up, driving under specific conditions, or after controller diagnostic monitors have run.
6. Perform any applicable Service Bulletins for controller software update information. Some conditions can be corrected by upgrading the Engine (ECM) or Transmission (TCM) controller software.
7. Check for any Service Information Tune-ups or Service Bulletins for any possible causes that may apply.

Were there any repairs made that fixed the vehicle?

Yes 

• Testing complete.
• Perform the AS68RC VERIFICATION TEST. Refer to Standard Procedure .

No 

• Perform the appropriate diagnostic procedure.