Possible Causes
WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| RELATED TCM POWER INPUT DTCS PRESENT |
| DTC P0871 ALSO PRESENT |
| LOSS OF 12-VOLT FEED |
| 4C PRESSURE SWITCH SENSE CIRCUIT OPEN |
| 4C PRESSURE SWITCH SENSE CIRCUIT SHORTED TO GROUND |
| EXCESSIVE FLUID LEAKAGE WITH 4C CLUTCH CIRCUIT |
| NO. 5 CHECK BALL CUT OR DAMAGED |
| LOW LINE PRESSURE |
| TRANSMISSION SOLENOID/TRS ASSEMBLY |
| POWERTRAIN CONTROL MODULE (PCM) |
| WIRING AND CONNECTORS |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
| GEAR | L/R | 2C | 4C | UD | OD |
|---|---|---|---|---|---|
| REVERSE | OPEN | OPEN | OPEN | OPEN | OPEN |
| P/N | CLOSED** | OPEN | OPEN | OPEN | OPEN |
| 1ST | CLOSED* | OPEN | OPEN | CLOSED | OPEN |
| 2ND | OPEN | CLOSED | OPEN | CLOSED | OPEN |
| 3RD | OPEN | OPEN | CLOSED | CLOSED | OPEN |
| 4TH | OPEN | OPEN | OPEN | CLOSED | CLOSED |
| 5TH | OPEN | OPEN | CLOSED | OPEN | CLOSED |
| 6TH | OPEN | CLOSED | OPEN | OPEN | CLOSED |
| *L/R is closed if output speed is below 100 RPM in Drive. L/R is closed in Manual (ERS) 1st gear. **May be open when rolling in Neutral or at low oil temperatures. |
|||||