GMC Sierra T1XX (2019-Present) transmission jerking when shifting, what to check?

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

569 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 GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, 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 opening the transmission fluid filler.

Symptoms

•Jerking or clunking sensation during gear shifts
•Unresponsive or delayed shifting
•Check engine light illuminated
•Increased engine RPMs without corresponding vehicle speed
•Fluid leakage underneath the vehicle
•Unusual transmission noises (grinding or whining)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related fault codes.
2
Check the transmission fluid level and condition; low or dirty fluid can lead to shifting issues.
3
Inspect the transmission fluid for signs of contamination or burning smell.
4
Verify the operation of the throttle position sensor (TPS) and engine control module (ECM) for proper input and output signals.
5
Examine the transmission mounts for wear or damage, which can lead to misalignment and shifting problems.
6
Conduct a road test to replicate the symptoms and note the conditions under which they occur.

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 jack
•Socket set
•Torque wrench
•Multimeter
•Drain pan

Parts Required

•Transmission fluid (OEM specified)
•Transmission filter and gasket
•Throttle position sensor (if replacement is necessary)
•Transmission mounts (if worn or damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related fault codes.
2
Check the transmission fluid level and condition; low or dirty fluid can lead to shifting issues.
3
Inspect the transmission fluid for signs of contamination or burning smell.
4
Verify the operation of the throttle position sensor (TPS) and engine control module (ECM) for proper input and output signals.
5
Examine the transmission mounts for wear or damage, which can lead to misalignment and shifting problems.
6
Conduct a road test to replicate the symptoms and note the conditions under which they occur.

Solution

1. Fluid Check and Replacement

Sub-steps:
- Park the vehicle on a level surface and allow the engine to cool.
- Remove the transmission dipstick and wipe it clean.
- Reinsert the dipstick, remove it again, and check the fluid level.
- If low, add the manufacturer-recommended transmission fluid until the correct level is reached.
- If the fluid is dark or has a burnt smell, proceed to change the fluid and filter.

2. Transmission Fluid Change

Sub-steps:
- Raise the vehicle securely on jack stands.
- Place a drain pan underneath the transmission pan.
- Remove the transmission pan bolts and carefully lower the pan to drain the fluid.
- Replace the transmission filter and clean the pan, ensuring that the magnet is free of debris.
- Reinstall the transmission pan with new gasket and torque to factory specifications.
- Fill the transmission with the recommended fluid through the dipstick tube.

3. Inspect and Replace Components

Sub-steps:
- Inspect the throttle position sensor and replace if faulty; use a multimeter to check voltage and continuity.
- Examine the transmission mounts; if cracked or worn, replace them to ensure proper alignment.
- Check the wiring and connectors related to the transmission for any signs of damage or corrosion.