Addressing "Check Transmission Fluid" Message in Chevrolet Silverado 1500 T1XX (2019-2023)

Step 1: Visual Inspection

1. Gather Tools:
   • Flashlight
   • Clean rag or paper towels
   • Container for catching fluid
2. Inspect the Transmission Fluid Level:
   • Park the vehicle on a level surface and turn off the engine.
   • Open the hood and locate the transmission dipstick (if applicable; some models may not have one).
   • Remove the dipstick, wipe it clean, reinsert it, and then remove it again to check the fluid level.
   • Ensure the fluid is at the proper level between the "Full" and "Add" marks.
3. Check for Leaks:
   • Look under the vehicle for any signs of transmission fluid leaks.
   • Check the transmission pan, cooler lines, and seals.

Step 2: Fluid Condition Check

1. Inspect Fluid Quality:
   • If the fluid level is low, use the clean rag to wipe the dipstick and observe the fluid’s color and smell.
   • Healthy transmission fluid should be a bright red color and have a faint odor.
   • Dark, brown fluid or a burnt smell indicates contamination and possible need for fluid replacement.

Step 3: Scan for Diagnostic Trouble Codes (DTCs)

1. Gather Tools:
   • OBD-II Scanner
2. Connect OBD-II Scanner:
   • Plug the OBD-II scanner into the vehicle’s diagnostic port (usually located beneath the dashboard on the driver's side).
   • Turn the ignition to the "On" position without starting the engine.
   • Read the codes related to the transmission; take note of any relevant codes (e.g., P0700, P0710, etc.).

Repair Instructions

Step 1: Add Transmission Fluid (if low)

1. Gather Tools:
   • Appropriate transmission fluid (check owner’s manual for specifications)
   • Funnel
2. Add Fluid:
   • If the fluid level is low, use the funnel to add transmission fluid through the dipstick tube slowly.
   • Check the level frequently to avoid overfilling.

Step 2: Replace Contaminated Fluid (if necessary)

1. Gather Tools:
   • Transmission fluid replacement kit (fluid, filter, gasket)
   • Socket set
   • Torque wrench
   • Transmission jack or ramps
   • Drain pan
2. Drain Old Fluid:
   • Raise the vehicle securely using ramps or jack stands.
   • Place a drain pan under the transmission pan and remove the pan bolts.
   • Allow the old fluid to drain completely.
3. Replace Filter:
   • Remove the old filter and replace it with a new one.
   • Ensure that the new filter is seated properly.
4. Clean and Reinstall Pan:
   • Clean the transmission pan and remove any old gasket material.
   • Apply a new gasket to the pan and reinstall it, torquing the bolts to the manufacturer's specifications.

Step 3: Clear Codes and Test Drive

1. Clear DTCs:
   • Use the OBD-II scanner to clear any stored DTCs.
2. Test Drive:
   • Take the vehicle for a short test drive to ensure the transmission operates smoothly and the warning message does not reappear.

Conclusion

If the "Check Transmission Fluid" message persists after following these steps, it may indicate a more serious issue such as internal transmission failure or electronic control problems. In such cases, it is recommended to consult a professional technician or dealership for further diagnosis and repair.