why does my Ford Explorer have a check transmission light on

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

560 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 check transmission light issues in Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always allow the engine to cool before working on the transmission.
•Use safety gloves to protect hands from sharp edges and hot components.

Symptoms

•Check transmission light illuminated on the dashboard
•Delayed or harsh shifting between gears
•Unusual noises coming from the transmission (grinding, whining)
•Fluid leaks under the vehicle
•Smell of burnt transmission fluid
•Poor acceleration or loss of power

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve any error codes related to the transmission.
2
Inspect the transmission fluid level and condition; check for burnt smell or discoloration.
3
Check for any visible leaks in the transmission lines or around the transmission pan.
4
Perform a visual inspection of the transmission wiring harness and connectors for damage or corrosion.
5
Test the operation of the transmission control module (TCM) and related sensors.
6
Verify the function of the transmission solenoids if applicable.

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
•Torque wrench
•Fluid pump
•Clean rags
•Safety gloves

Parts Required

•Transmission fluid (as specified in the owner’s manual)
•Transmission filter (if applicable)
•Gasket for transmission pan (if applicable)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve any error codes related to the transmission.
2
Inspect the transmission fluid level and condition; check for burnt smell or discoloration.
3
Check for any visible leaks in the transmission lines or around the transmission pan.
4
Perform a visual inspection of the transmission wiring harness and connectors for damage or corrosion.
5
Test the operation of the transmission control module (TCM) and related sensors.
6
Verify the function of the transmission solenoids if applicable.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface and the engine is off.
Gather necessary tools: OBD-II scanner, socket set, torque wrench, fluid pump, clean rags, and safety gloves.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission dipstick (if equipped) and check the fluid level.
2. If low, use a fluid pump to add the recommended transmission fluid type (refer to the owner’s manual).
3. If fluid is burnt or contaminated, drain the old fluid by removing the transmission pan.
4. Replace the transmission filter if applicable, ensuring to clean the pan and replace the gasket.
5. Refill the transmission with new fluid to the proper level.

3. Inspect and Repair Wiring

Sub-steps:
1. Inspect the wiring harness connected to the transmission for any visible signs of wear, fraying, or corrosion.
2. Repair or replace damaged wires or connectors to ensure proper electrical connection.
3. Secure any loose connections and ensure all connectors are clean and free of debris.

4. Test Transmission Control Module (TCM)

Sub-steps:
1. Use the OBD-II scanner to check for any stored fault codes related to the TCM.
2. If codes indicate an issue, reflash or replace the TCM as necessary, following manufacturer instructions.
3. Clear the fault codes and perform a test drive to confirm proper operation.