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 DTC IS ACTIVE

Turn the ignition on.
With the scan tool, read active DTCs.
Is this DTC active?

Yes
- Refer to the DTC INDEX - 2500 HD & 3500 HD article and perform the U0146-LOST COMMUNICATION WITH CENTRAL GATEWAY diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.