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

Ram 1500 DT (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

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

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

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

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.