Diagnostic Test
WARNING: This page is about a different car, the 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR A DTC C121C-TORQUE REQUEST SIGNAL DENIED NOTE:
This DTC must be active for the results of this test to be valid and this DTC may set while driving under severe load conditions.
- Turn the ignition on.
- With the scan tool, read and record DTC's.
- With the scan tool, read and record Freeze Frame information.
- With the scan tool, erase DTC's.
- Cycle the ignition switch from off to on.
- Start Engine.
- With the scan tool, read and record DTC's.
Does the scan tool display: C121C-TORQUE REQUEST SIGNAL DENIED?
Yes
- Go To 2.
No
- Perform the ABS INTERMITTENT CONDITION diagnostic procedure. Refer to ABS INTERMITTENT CONDITION .
- CHECK THE POWERTRAIN DTC's
- With the scan tool, read and record Powertrain DTC's.
Were any Powertrain ESP related DTC's found?
Yes
- Replace the Powertrain Module in accordance with the Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L .
No
- Replace the Antilock Brake Module in accordance with the Service Information.
- Perform ABS VERIFICATION TEST - VER 1. Refer to ABS VERIFICATION TEST .
- With the scan tool, read and record Powertrain DTC's.