why does my Genesis G70's transmission jerk when shifting

Genesis G70 1st Gen (2018-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

430 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 jerking in Genesis G70. 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

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

Symptoms

•Transmission jerks or slams during shifting
•Delayed engagement when accelerating
•Unusual noises (clunking or grinding) during shifts
•Increased engine RPMs without corresponding vehicle speed
•Fluctuating transmission fluid levels or discoloration
•Check engine light illuminated

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related faults.
2
Inspect transmission fluid level and condition; check for contamination or burnt smell.
3
Check for proper operation of the transmission control module (TCM) and its connections.
4
Test the gearbox sensors (e.g., throttle position sensor, speed sensors) for proper function.
5
Inspect the transmission mounts for wear or damage that could affect shifting.
6
Road test the vehicle to replicate the issue under various driving conditions.

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 fluid pump
•Socket set
•Torque wrench
•Screwdrivers

Parts Required

•Transmission fluid (ATF SP-IV or equivalent)
•Transmission filter (if applicable)
•Transmission mounts (if worn)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related faults.
2
Inspect transmission fluid level and condition; check for contamination or burnt smell.
3
Check for proper operation of the transmission control module (TCM) and its connections.
4
Test the gearbox sensors (e.g., throttle position sensor, speed sensors) for proper function.
5
Inspect the transmission mounts for wear or damage that could affect shifting.
6
Road test the vehicle to replicate the issue under various driving conditions.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Change Transmission Fluid

Sub-steps:
1. Locate the transmission fluid dipstick and remove it to check fluid level.
2. If the fluid is low or dirty, drain the transmission fluid using a fluid pump.
3. Replace the transmission filter if applicable.
4. Refill with new transmission fluid as specified in the owner's manual (typically ATF SP-IV or equivalent).
5. Start the engine and cycle through the gears while checking the fluid level again.

3. Reset Transmission Control Module (TCM)

Sub-steps:
1. Reconnect the battery terminals.
2. Use the OBD-II scanner to reset the TCM.
3. Follow the manufacturer's procedure for relearning shift patterns if necessary.

4. Inspect and Replace Damaged Components

Sub-steps:
1. Inspect the transmission mounts; replace if cracked or worn.
2. Check all wiring and connectors leading to the TCM and gearbox sensors.
3. Replace any damaged or corroded components as needed.

5. Road Test

Sub-steps:
1. Conduct a thorough road test to ensure proper shifting and that the jerking issue is resolved.
2. Monitor for any new symptoms or error codes.

Tools Required:

OBD-II scanner
Transmission fluid pump
Socket set
Torque wrench
Screwdrivers

Parts Required:

Transmission fluid (ATF SP-IV or equivalent)
Transmission filter (if applicable)
Transmission mounts (if worn)

Estimated Repair Time: 2-4 hours

Safety Warnings:

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