how to fix P0700 transmission control system malfunction in my Ram 1500 DT (2019-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on the electrical system.
• Raise the vehicle and secure it on jack stands if needed.

2. Check Transmission Fluid

• Tools Required: Transmission fluid dipstick, funnel, replacement transmission fluid.
• Remove the transmission dipstick and check the fluid level.
• If low, add the appropriate type of transmission fluid as specified in the owner's manual.

3. Inspect and Repair Wiring

• Tools Required: Multimeter, wire strippers, electrical tape.
• Inspect the wiring harness connected to the TCM for any signs of wear or damage.
• Use a multimeter to check for continuity and proper voltage.
• Repair or replace any damaged wires, ensuring they are properly insulated with electrical tape.

4. Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench.
• Disconnect the battery again.
• Locate the TCM (usually near the transmission or under the dashboard).
• Remove the bolts securing the TCM and disconnect the harness.
• Install the new TCM, ensuring all connections are secure and bolt down according to the manufacturer’s torque specifications.

5. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use an OBD-II scanner to clear the P0700 code and any other related codes.
• Perform a test drive to assess transmission performance.