how to address the P0780 code in my Ram 1500 DT (2019-Present) transmission?

Learn how to diagnose and fix P0780 transmission issues in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the electrical system.

Tools Required:

• OBD-II scanner
• Transmission fluid pressure gauge
• Multimeter
• Socket set
• Torque wrench

2. Check and Replace Transmission Fluid

1. Check Fluid Level:

   • With the engine running, check the transmission fluid level using the dipstick.
   • If low, top off with manufacturer-recommended transmission fluid.

2. Change Fluid:

   • Drain the old transmission fluid by removing the drain plug or pan.
   • Replace the transmission filter according to manufacturer specifications.
   • Reinstall the pan with a new gasket and torque to the specified value.

3. Inspect and Repair Wiring

1. Visual Inspection:

   • Examine all wiring harnesses connected to the TCM and transmission for frays or breaks.

2. Repair or Replace:

   • Repair any damaged wiring using solder and heat-shrink tubing or replace the entire harness if necessary.

4. Test and Replace TCM if Necessary

1. Testing:

   • Use a multimeter to check for proper voltage and grounds at the TCM connectors.

2. Replacement:

   • If the TCM is faulty, remove the old module and install a new one, ensuring all connections are secure.

5. Reconnect Battery and Test Drive

1. Reconnect Battery:

   • Reattach the battery terminals securely.

2. Test Drive:

   • Start the vehicle and take it for a test drive to ensure proper shifting and responsiveness.