how to fix GMC Sierra T1XX (2019-Present) jerking when shifting gears?

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

575 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 jerking during gear shifts in GMC Sierra T1XX (2019-Present). 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 components.
•Allow the engine to cool before working near the transmission or engine components.

Symptoms

•Jerking or lurching sensation during gear shifts
•Delayed engagement when shifting into drive or reverse
•Check engine light illuminated
•Unusual noises (clunking or grinding) during shifting
•Poor acceleration or loss of power
•Increased RPMs without corresponding speed increase

Diagnostic Steps

1
Scan the vehicle's onboard computer for diagnostic trouble codes (DTCs) using an OBD-II scanner.
2
Check the transmission fluid level and condition; look for dark, burnt fluid or metal shavings.
3
Inspect the transmission mount for signs of wear or damage.
4
Test the throttle position sensor (TPS) for proper voltage and response.
5
Examine the engine mounts for excessive play or deterioration.
6
Perform a road test to observe the behavior of the transmission under various 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
•Socket set
•Torque wrench
•Multimeter
•Fluid pump
•Screwdrivers

Parts Required

•Transmission fluid (manufacturer-recommended)
•Throttle position sensor (if replacement is necessary)
•Transmission mount (if replacement is necessary)
•Engine mounts (if replacement is necessary)

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Diagnostic Steps

1
Scan the vehicle's onboard computer for diagnostic trouble codes (DTCs) using an OBD-II scanner.
2
Check the transmission fluid level and condition; look for dark, burnt fluid or metal shavings.
3
Inspect the transmission mount for signs of wear or damage.
4
Test the throttle position sensor (TPS) for proper voltage and response.
5
Examine the engine mounts for excessive play or deterioration.
6
Perform a road test to observe the behavior of the transmission under various conditions.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative battery terminal to ensure safety.

2. Fluid Check and Replacement

Check Fluid Level:
- Remove the transmission dipstick and wipe it clean.
- Reinsert the dipstick and pull it out again to check the fluid level.
Replace Fluid:
- If the fluid is low or burnt, drain the transmission fluid using a fluid pump.
- Replace with manufacturer-recommended transmission fluid (check owner’s manual for specifications).
- Refill the transmission to the proper level.

3. Inspect and Replace Components

Transmission Mount:
- Locate the transmission mount and inspect for any cracks or excessive wear.
- If damaged, remove the bolts securing the mount and replace it with a new one.
- Torque the bolts to manufacturer specifications.
Throttle Position Sensor:
- Access the TPS located on the throttle body.
- Disconnect the electrical connector and remove the mounting screws.
- Install the new TPS and reconnect the electrical connector.
- Use a multimeter to ensure proper voltage output.

4. Engine Mount Inspection

Engine Mounts:
- Visually inspect the engine mounts for signs of wear or oil leakage.
- If damaged, support the engine with a jack and replace the engine mounts.
- Torque the mounting bolts to the specifications provided in the service manual.