Why does my 2020 Silverado 1500 T1XX have a rough transmission shift?

Chevrolet Silverado 1500 T1XX (2019-2023)

Error Codes

medium

Difficulty

medium

Severity

Error Code: P0700

3 min read

566 words

Problem Statement

Learn how to diagnose and fix rough transmission shifts in your 2020 Chevrolet Silverado 1500 T1XX. Follow our step-by-step guide for effective troubleshooting.

Error Code

P0700

Affected Component

Transmission

Symptoms

•Rough Shifting
•Delayed Engagement
•Unusual Noise
•Check Engine Light

Diagnostic Steps

1
Check for Diagnostic Trouble Codes (DTCs)
2
Inspect Transmission Fluid
3
Examine Transmission Control Module (TCM)
4
Test Drive
5
Inspect Transmission Mounts

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 dipstick
•Funnel for adding transmission fluid
•Torque wrench
•Basic hand tools
•Transmission fluid
•Multi-meter

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Solution

Tools Required

OBD-II Scanner
Transmission fluid dipstick (if applicable)
Funnel for adding transmission fluid
Torque wrench
Basic hand tools (sockets, wrenches)
Transmission fluid (as specified in the owner’s manual)
Multi-meter (for electrical inspection)

Repair Instructions

Step 1: Retrieve DTCs

Connect the OBD-II scanner to the diagnostic port under the dashboard.
Turn the ignition to the ON position (do not start).
Access the transmission control system and read any codes.
Make a note of any relevant codes for further investigation.

Step 2: Inspect Transmission Fluid

Park the vehicle on a level surface and engage the parking brake.
Start the engine and let it warm up to operating temperature.
Remove the transmission dipstick (if applicable) and wipe it clean.
Reinsert the dipstick and remove it again to check the level.
- If low, add the recommended transmission fluid until the proper level is reached.
- If fluid is dark or burnt, consider a fluid flush and filter change.

Step 3: Inspect TCM Connections

Locate the TCM, usually found near the transmission or under the dash.
Disconnect the wiring harness and inspect for corrosion or loose connections.
Reconnect and, if necessary, reprogram the TCM using a diagnostic tool.

Step 4: Check Transmission Mounts

Visually inspect the transmission mounts for cracks or excessive wear.
Use a torque wrench to ensure all mounting bolts are appropriately tightened.
Consider replacing damaged mounts to restore proper alignment.

Step 5: Test Drive and Recheck

After making any repairs, take the vehicle for a test drive to see if the issue persists.
Pay attention to shifts at various speeds and loads.

Conclusion

If the rough shifting persists after performing the above steps, a more in-depth inspection may be required, including:

Internal transmission inspection (for band or clutch issues).
Fluid pump and valve body examination.
Possible replacement of the transmission if internal components are damaged.

For complex issues or if you’re unsure, it’s advisable to consult with a professional technician or a dealership for advanced diagnostics and repairs.