what does it mean if my Toyota Highlander Fourth Generation (2020-present) shows code P0750

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0750

3 min read

529 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 P0750 transmission shift solenoid issue in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0750

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 opening the transmission fluid system.

Symptoms

•Check engine light illuminated
•Erratic shifting or difficulty in shifting gears
•Transmission slipping or harsh engagement
•Poor acceleration performance
•Reduced fuel efficiency

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system with an OBD-II scanner to confirm the presence of code P0750.
2
Inspect the transmission fluid level and condition for any signs of contamination or low levels.
3
Check the wiring and connectors related to the shift solenoid 'A' for any signs of damage, corrosion, or loose connections.
4
Test the resistance of the shift solenoid 'A' using a multimeter to determine if it is within specifications.
5
Verify the functionality of the transmission control module (TCM) for any faults or programming issues.

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
•Screwdrivers

Parts Required

•Transmission shift solenoid 'A' (if replacement is necessary)
•Transmission fluid (if topping up or flushing is needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system with an OBD-II scanner to confirm the presence of code P0750.
2
Inspect the transmission fluid level and condition for any signs of contamination or low levels.
3
Check the wiring and connectors related to the shift solenoid 'A' for any signs of damage, corrosion, or loose connections.
4
Test the resistance of the shift solenoid 'A' using a multimeter to determine if it is within specifications.
5
Verify the functionality of the transmission control module (TCM) for any faults or programming issues.

Solution

1. Preparation

Gather tools and ensure the vehicle is parked on a flat surface with the engine off.
Disconnect the vehicle battery to prevent electrical shorts during repairs.

Tools Required:

OBD-II scanner
Multimeter
Socket set
Torque wrench
Screwdrivers

2. Inspect Transmission Fluid

Remove the transmission dipstick and check the fluid level.
If the fluid is low, top it up with the manufacturer-recommended transmission fluid.
If the fluid is discolored or has a burnt smell, consider flushing and replacing the fluid.

3. Check Wiring and Connectors

Locate the wiring harness connected to the shift solenoid 'A' (consult the vehicle service manual for exact location).
Visually inspect the wiring for frays or corrosion.
Disconnect the connector and clean it with electrical contact cleaner if corrosion is present.

4. Test Shift Solenoid 'A'

Disconnect the shift solenoid 'A' from the wiring harness.
Using a multimeter, set it to the resistance measurement mode.
Connect the multimeter leads to the solenoid terminals and compare the resistance reading to the specifications found in the service manual.
If the resistance is outside the specified range, replace the solenoid.

5. Reassemble and Reconnect

If any components were replaced, reassemble them in reverse order.
Reconnect any disconnected wiring and ensure all connections are secure.
Reconnect the vehicle battery.