why does my Honda Accord 10th Generation (2018-2022) dashboard say "check transmission"?

Honda Accord 8th Generation (2008-2012)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

632 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 the 'check transmission' warning in Honda Accord 10th Generation (2018-2022). Step-by-step guide with symptoms and solutions.

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 system.

Symptoms

•Check engine light illuminated
•Slipping gears during acceleration
•Unusual noise from the transmission
•Delayed or harsh shifting
•Fluid leaks underneath the vehicle
•Increased engine RPM without corresponding speed increase

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific transmission-related trouble codes.
2
Check the transmission fluid level and condition, inspecting for discoloration or burning smell.
3
Inspect the transmission for any visible leaks or damage to seals and gaskets.
4
Verify the operation of the transmission control module (TCM) and its connections.
5
Test drive the vehicle to monitor transmission behavior and confirm symptoms.
6
Evaluate the condition of the transmission fluid; if it is low or burnt, further investigation is needed.

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
•Transmission dipstick
•Socket set
•Wrench
•Transmission filter kit
•Fluid catch pan
•Multimeter

Parts Required

•Honda ATF DW-1 transmission fluid
•Transmission filter kit
•New transmission pan gasket

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific transmission-related trouble codes.
2
Check the transmission fluid level and condition, inspecting for discoloration or burning smell.
3
Inspect the transmission for any visible leaks or damage to seals and gaskets.
4
Verify the operation of the transmission control module (TCM) and its connections.
5
Test drive the vehicle to monitor transmission behavior and confirm symptoms.
6
Evaluate the condition of the transmission fluid; if it is low or burnt, further investigation is needed.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Safety equipment: gloves and safety glasses.

2. Check Transmission Fluid

Tools Required: Transmission dipstick, funnel, clean rag.
Sub-steps:
1. Locate the transmission dipstick; remove it and wipe it clean with a rag.
2. Reinsert the dipstick fully, then remove it again to check the fluid level.
3. If fluid is low, add the appropriate transmission fluid (Honda ATF DW-1) through the dipstick tube until the correct level is reached.
4. If fluid appears burnt or contaminated, proceed to the next step.

3. Change Transmission Fluid and Filter

Tools Required: Socket set, wrench, transmission filter kit, fluid catch pan.
Sub-steps:
1. Place a fluid catch pan under the transmission pan.
2. Remove the transmission pan bolts using a socket set and lower the pan carefully.
3. Replace the transmission filter as per the kit instructions.
4. Clean the pan and install a new gasket.
5. Reattach the pan and tighten all bolts to the manufacturer's torque specifications (typically around 10-15 ft-lbs).
6. Refill the transmission with the correct amount of Honda ATF DW-1 fluid through the dipstick tube.

4. Inspect and Test TCM

Tools Required: Multimeter.
Sub-steps:
1. Locate the transmission control module.
2. Disconnect the TCM connector and inspect for corrosion or damage.
3. Using a multimeter, check for proper voltage at the connector pins.
4. If voltage is absent or inconsistent, repair or replace the wiring harness as necessary.

5. Reset the Transmission Control System

Tools Required: OBD-II scanner.
Sub-steps:
1. Use an OBD-II scanner to clear any transmission-related trouble codes.
2. Start the engine and allow it to reach operating temperature.
3. Drive the vehicle to ensure the transmission shifts smoothly and the warning light does not reappear.