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

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

Ram 1500 DT (2019-Present)

Error Codes
Severity: highDifficulty: mediumError Code: P07002-4 hours
3 min read
539 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0700 transmission control system malfunction in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0700
Component
Transmission
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before checking or adding transmission fluid.

Symptoms

  • •Check engine light illuminated
  • •Transmission slipping or jerking
  • •Delayed or harsh shifting
  • •Inability to engage certain gears
  • •Poor fuel economy
  • •Transmission overheating

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to retrieve any additional codes related to the transmission.
  2. 2Inspect the transmission fluid level and condition; look for signs of contamination or burning.
  3. 3Check the wiring and connectors to the transmission control module for damage or corrosion.
  4. 4Perform a visual inspection of the transmission for any leaks or obvious damage.
  5. 5Test the battery voltage and ground connections to ensure proper power supply to the TCM.
  6. 6Check for TCM software updates or recalls that may address the issue.

Solution

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.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set
  • Screwdrivers
  • Torque wrench

Parts Required

  • Transmission fluid (Mopar ATF+4)
  • Transmission control module (if replacement is necessary)

Additional Information

Error CodeP0700
Component

Transmission

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

4 items

Parts

2 items

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