how to diagnose P0700 code on my Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Transmission Fluid

• Locate the transmission dipstick (if equipped) or access the transmission fill plug.
• Remove the dipstick or fill plug and check the fluid level.
• If fluid is low, top off with the recommended transmission fluid (e.g., Mopar ATF+4).
• If fluid is dark or has a burnt smell, consider a transmission fluid change.

3. Inspect Wiring and Connectors

• Visually inspect the wiring harness connected to the TCM.
• Look for frayed wires, loose connections, or corrosion.
• If any issues are found, repair or replace the damaged wiring or connectors.

4. Check TCM Functionality

• Reconnect the battery terminal and reconnect the OBD-II scanner.
• Clear the error codes and take the vehicle for a test drive to see if the P0700 code reappears.
• If it does, further testing of the TCM may be required, including checking the power and ground circuits.

5. Replace TCM (if necessary)

• If the TCM is determined to be faulty, remove the protective cover to access the module.
• Disconnect the wiring harness and remove the mounting bolts securing the TCM.
• Install the new TCM, ensuring it is properly seated and secured.
• Reconnect the wiring harness and cover.