Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS ACTIVE

Ignition on, engine not running.
With the scan tool, read DTCs and record on vehicle work order.
Is the DTC Active at this time?

Yes

NOTE:
Diagnose the U0002-88 CAN C BUS OFF PERFORMANCE-BUSS OFF as the U0010-00 CAN C BUS CIRCUIT test.
- Perform the U0010-00-CAN C BUS diagnostic procedure. Refer to DTC INDEX - 2500 HD & 3500 HD article.
No
- Perform the STORED LOST COMMUNICATION DTCs diagnostic procedure. Refer to DIAGNOSIS AND TESTING .