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

Ram 1500 DT (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

516 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 issues in Ram 1500 DT (2019-present). 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 engine and transmission to cool before servicing to prevent burns.

Symptoms

•Check engine light illuminated
•Transmission not shifting properly
•Slipping or harsh shifting during gear changes
•Vehicle going into limp mode
•Delayed engagement when shifting from park to drive/reverse

Diagnostic Steps

1
Scan for additional trouble codes using an OBD-II scanner to gather more information about the transmission system.
2
Check transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect wiring and connectors related to the transmission control module (TCM) for damage or corrosion.
4
Perform a visual inspection of the transmission for leaks or physical damage.
5
Test the TCM with a multimeter to ensure proper voltage and ground signal.
6
Check for any TCM software updates or recalls that may need to be addressed.

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
•Multimeter
•Socket set
•Torque wrench
•Electrical contact cleaner

Parts Required

•Transmission control module (if replacement is necessary)
•Transmission fluid (if low)

Related Faults

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Diagnostic Steps

1
Scan for additional trouble codes using an OBD-II scanner to gather more information about the transmission system.
2
Check transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect wiring and connectors related to the transmission control module (TCM) for damage or corrosion.
4
Perform a visual inspection of the transmission for leaks or physical damage.
5
Test the TCM with a multimeter to ensure proper voltage and ground signal.
6
Check for any TCM software updates or recalls that may need to be addressed.

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.