how to fix transmission codes P0715 and P0720 on Toyota RAV4 XA50 (2019-2024)

Toyota RAV4 XA50 (2019-2024)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0715, P0720

3 min read

570 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 transmission codes P0715 and P0720 on Toyota RAV4 XA50 (2019-2024). Step-by-step guide with tools and procedures.

Error Code

P0715, P0720

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine to cool before opening the transmission system.

Symptoms

•Check engine light illuminated
•Erratic shifting or harsh transmission behavior
•Transmission slipping or loss of power during acceleration
•Delayed engagement when shifting into gear
•Poor fuel economy

Diagnostic Steps

1
Use an OBD-II scanner to confirm the presence of codes P0715 and P0720.
2
Visually inspect the wiring and connectors for the input and output speed sensors for damage or corrosion.
3
Measure resistance of the input and output speed sensors using a multimeter to check for proper functionality.
4
Inspect the transmission fluid level and condition, ensuring it is at the correct level and not contaminated.
5
Test the vehicle's performance by driving and monitoring for symptoms, noting any changes during operation.

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
•Transmission fluid

Parts Required

•Input speed sensor
•Output speed sensor
•Transmission fluid (Toyota ATF WS)

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Diagnostic Steps

1
Use an OBD-II scanner to confirm the presence of codes P0715 and P0720.
2
Visually inspect the wiring and connectors for the input and output speed sensors for damage or corrosion.
3
Measure resistance of the input and output speed sensors using a multimeter to check for proper functionality.
4
Inspect the transmission fluid level and condition, ensuring it is at the correct level and not contaminated.
5
Test the vehicle's performance by driving and monitoring for symptoms, noting any changes during operation.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid.
Disconnect the vehicle’s battery to prevent electrical shorts.
Allow the vehicle to cool if it has been running.

2. Inspect and Repair Wiring

Sub-steps:
- Remove the undercarriage cover if applicable.
- Trace the wiring harness connected to the input and output speed sensors.
- Repair any damaged wires or connectors found during the visual inspection.
- Ensure all connections are secure and free from corrosion.

3. Replace Sensors

Input Speed Sensor Replacement:
- Locate the input speed sensor on the transmission.
- Remove the electrical connector by pressing the tab and pulling it off.
- Unscrew the sensor using the appropriate socket size.
- Install the new sensor and torque it to the manufacturer's specification (typically around 8-12 Nm).
- Reconnect the electrical connector.
Output Speed Sensor Replacement:
- Locate the output speed sensor on the transmission.
- Remove the electrical connector as described above.
- Unscrew the sensor using the appropriate socket size.
- Install the new sensor and torque it to the manufacturer's specification (typically around 8-12 Nm).
- Reconnect the electrical connector.

4. Fluid Check and Replacement

Sub-steps:
- Check the transmission fluid level using the dipstick.
- If fluid is low or dirty, drain and replace with the manufacturer-recommended fluid (typically Toyota ATF WS).
- Refill the transmission to the proper level.

5. Clear Codes and Test Drive

Use the OBD-II scanner to clear the transmission codes.
Reconnect the battery.
Test drive the vehicle to ensure that the transmission operates smoothly and the check engine light does not reappear.