my Toyota Corolla E170 (2013-2019) has a check engine light with P0700 code what does it mean

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

534 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 malfunction in Toyota Corolla E170. 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 inspecting the transmission.

Symptoms

•Check engine light illuminated
•Possible erratic transmission shifting
•Delayed engagement when shifting from park to drive or reverse
•Transmission slipping or harsh shifting
•Reduced fuel efficiency

Diagnostic Steps

1
Scan for additional error codes using an OBD-II scanner to gather more information about the transmission issue.
2
Inspect the transmission fluid level and condition; low or burnt fluid may indicate issues.
3
Check the wiring and connectors related to the transmission control module (TCM) for damage or corrosion.
4
Test the TCM for proper functionality using a multimeter to check voltage and ground signals.
5
Perform a visual inspection of the transmission for any leaks or external damage.
6
Check for any software updates or recalls related to the transmission system from the manufacturer.

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 dipstick (if applicable)
•Clean cloth
•Wire strippers
•Soldering iron (if necessary)
•Electrical connectors
•Funnel
•Transmission fluid

Parts Required

•Transmission Control Module (if faulty)
•Transmission fluid (if refilling)

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Diagnostic Steps

1
Scan for additional error codes using an OBD-II scanner to gather more information about the transmission issue.
2
Inspect the transmission fluid level and condition; low or burnt fluid may indicate issues.
3
Check the wiring and connectors related to the transmission control module (TCM) for damage or corrosion.
4
Test the TCM for proper functionality using a multimeter to check voltage and ground signals.
5
Perform a visual inspection of the transmission for any leaks or external damage.
6
Check for any software updates or recalls related to the transmission system from the manufacturer.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the vehicle battery to prevent electrical shorts during repair.

2. Check Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick (if applicable) or access the fill plug.
2. Remove the dipstick or fill plug and check the fluid level.
3. Inspect the fluid for a burnt smell or dark coloration, indicating contamination.
Tools Required: Transmission dipstick (if applicable), clean cloth.

3. Repair or Replace Wiring/Connectors

Sub-steps:
1. Visually inspect harness and connectors for corrosion or damage.
2. Repair damaged wires or replace corroded connectors as necessary.
3. Ensure all connections are secure before reassembling.
Tools Required: Wire strippers, soldering iron (if necessary), electrical connectors.

4. Replace Transmission Control Module (if faulty)

Sub-steps:
1. Locate the TCM, usually found near the transmission or under the dashboard.
2. Disconnect the electrical connectors from the TCM.
3. Remove the mounting bolts and carefully take out the faulty TCM.
4. Install the new TCM, ensuring it is securely mounted.
5. Reconnect the electrical connectors.
Tools Required: Socket set, torque wrench, possibly a TCM replacement.

5. Refill Transmission Fluid

Sub-steps:
1. If fluid was low, refill the transmission with the manufacturer-recommended fluid type.
2. Start the engine and cycle through gears to circulate fluid.
3. Check the fluid level again and add more if necessary.
Tools Required: Funnel, transmission fluid.