Ram 1500 DT (2019-Present) check engine light on with code P0700

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the vehicle to cool down if it has been running.

2. Check Transmission Fluid

• Locate the transmission dipstick or fill plug.
• Remove the dipstick, wipe it clean, and reinsert it to check fluid level.
• If low, add the manufacturer-recommended transmission fluid (refer to the owner's manual for specifications).

3. Inspect Wiring and Connectors

• Access the TCM, typically located under the dashboard or near the transmission.
• Visually inspect the wiring harness for frays or disconnections.
• Clean any corroded connectors with electrical contact cleaner and reconnect securely.

4. Replace Transmission Control Module (if necessary)

• If diagnostics indicate a faulty TCM:
  • Remove any panels obstructing access to the TCM.
  • Disconnect the wiring harness from the TCM.
  • Unbolt the TCM using the appropriate socket size.
  • Install the new TCM, securing it in place and reconnecting the wiring harness.

5. Clear Codes and Test Drive

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0700 code and any additional codes.
• Test drive the vehicle to ensure proper transmission operation and check if the check engine light remains off.