What the TPMS reset procedure does on a 2016 CT6
The tire pressure monitoring system (TPMS) on your 2016 Cadillac CT6 learns which sensor belongs to which wheel position when you drive. If you replace a tire, swap wheels, or install new sensors, the system needs to relearn the sensor locations — otherwise it will not read pressure correctly or will throw warning lights. The relearn procedure tells the car's computer to forget the old sensor assignments and match new ones to each wheel.
Cadillac built two ways to do this into the CT6: a manual relearn using the driver information center (DIC) menu, and an automatic relearn that happens while you drive. The manual method is faster and more reliable if you have just replaced sensors or rotated tires.
Key Takeaways
- The 2016 CT6 TPMS relearn procedure is accessed through the vehicle settings menu on the dashboard display, not through a separate tool or computer.
- You must have all four tires properly inflated to the door jamb specification before starting the relearn, or the system will not complete correctly.
- The manual relearn takes about 10 minutes and requires you to sit in the driver's seat with the engine running but the car in Park.
- If the relearn fails or the warning light returns after driving, the most common cause is a sensor that is not communicating or a tire that is underinflated.
Prepare your tires and check sensor batteries before you start
Before you begin the relearn, all four tires must be inflated to the pressure listed on the driver's door jamb — not the maximum pressure on the tire sidewall. The CT6 door jamb typically specifies 32 psi front and rear, but check your specific vehicle. Use a reliable tire pressure gauge and inflate or deflate each tire to match exactly.
If you have just installed new TPMS sensors, make sure they are the correct part number for the CT6 and that they are seated firmly in the valve stems. Sensors that are loose or incompatible will not communicate with the vehicle computer. If you are relearning after a tire rotation or repair, the original sensors should already be working — the relearn just reassigns them to new positions.
New TPMS sensors come with batteries that last 5 to 10 years. If your sensors are more than seven years old and you are experiencing repeated relearn failures, the batteries may be dead. Replacing the sensors is the only fix in that case.
Access the TPMS relearn menu through vehicle settings
Sit in the driver's seat with the engine off. Locate the Vehicle Settings button on your steering wheel — it is usually on the left side below the cruise control buttons. Press and hold it until the main menu appears on the driver information center display.
Use the up and down arrow buttons on the steering wheel to scroll to Tire Pressure Monitor or TPMS. The exact menu name varies slightly by model year, but it will contain the word "tire" or "pressure." Press the center select button to enter that submenu.
You should see an option that says Relearn Tire Positions, Relearn Sensors, or Start Relearn. Select this option. The display will confirm that you are about to start the relearn procedure and may ask you to confirm by pressing the button again.
Complete the relearn cycle with the engine running
Once you confirm the relearn start, start the engine but keep the car in Park. The display will show a message like "Relearn in progress" or "Driving required to complete relearn." Do not turn off the engine or shift out of Park yet — the system is initializing.
After 30 seconds to one minute, the display will tell you to drive the vehicle. Shift into Drive and operate the car at normal highway speeds (40 to 55 mph) for about 10 to 15 minutes. The system reads wheel speed data from the ABS sensors as you drive and matches it to the TPMS sensor signals to determine which sensor is at which wheel.
Drive in a straight line as much as possible during this time. Avoid hard acceleration, braking, or sharp turns, as these can confuse the wheel speed readings. Once you have driven for the required time, return to your parking spot, shift into Park, and turn off the engine.
Verify the relearn completed and check for warning lights
Wait about one minute after turning off the engine, then start the car again and check the driver information center display. It should show a message confirming that the relearn was successful, such as "Relearn complete" or "TPMS relearn successful." If you see this message, the procedure is finished and your sensors are now assigned to the correct wheel positions.
Drive the vehicle for a few more minutes at normal speeds and watch the instrument cluster. The TPMS warning light — a horseshoe-shaped icon with an exclamation mark — should not illuminate. If it does, the relearn did not complete properly or one of the sensors is not communicating.
Check all four tire pressures again with a gauge. If any tire has dropped below the door jamb specification, inflate it and drive for another 10 minutes. Sometimes a tire that was slightly low during the relearn will cause the system to flag it even after the relearn completes.
What to do if the relearn fails or the warning light returns
If the display shows an error message during the relearn or the TPMS light comes back on after you have driven, the most common cause is a sensor that is not transmitting. This can happen if a sensor battery is dead, the sensor is loose in the valve stem, or the sensor was damaged during tire installation.
Start by removing each wheel and visually inspecting the TPMS sensor where it screws into the valve stem. If the sensor is loose, tighten it by hand — do not use a wrench, as you can crack the sensor housing. Reinstall the wheel and try the relearn procedure again.
If the warning light persists after a second relearn attempt, one sensor is likely faulty. You can identify which one by using a TPMS diagnostic tool or by visiting a tire shop that has one. The tool will show which wheel position is not communicating. Replace that sensor and repeat the relearn procedure.
Alternative: automatic relearn while driving
If you prefer not to use the manual menu procedure, the CT6 can relearn sensor positions automatically. After replacing a sensor or rotating tires, straightforward drive the vehicle at speeds above 20 mph for 20 to 30 minutes with the TPMS warning light illuminated. The system will gradually match sensors to wheel positions and the light will turn off on its own.
This method works but is slower and less reliable than the manual relearn, especially if you are in stop-and-go traffic. The manual procedure is recommended if you have just replaced sensors or if you need the system working correctly right away.
Frequently Asked Questions
Do I need a special tool to relearn the TPMS on a 2016 CT6?
No. The relearn procedure is built into the vehicle's menu system and requires only the steering wheel buttons and the driver information center display. You do not need a computer, diagnostic scanner, or external tool.
Can I relearn the TPMS if one of my tires is flat?
No. All four tires must be inflated to the door jamb pressure before you start. If a tire is flat or significantly underinflated, the system will not complete the relearn correctly. Inflate all tires first, then begin the procedure.
How long does the relearn procedure take from start to finish?
The manual relearn takes about 25 to 30 minutes total: a few minutes to access the menu and confirm, then 10 to 15 minutes of driving at highway speed. The automatic relearn while driving takes 20 to 30 minutes but does not require you to use the menu.
What if the TPMS light comes back on a week after I completed the relearn?
Check all four tire pressures when ready. Tires naturally lose pressure over time, especially in cold weather. If any tire is below the door jamb specification, inflate it. If pressures are correct and the light is still on, a sensor battery may be failing or a sensor may have become loose. Inspect the sensors and consider having them tested with a diagnostic tool.
Can I relearn the TPMS myself, or do I need to go to a Cadillac dealer?
You can do the relearn yourself using the procedure in this guide. Many tire shops and independent mechanics also offer TPMS relearn as a service, usually for $15 to $50 per vehicle. A dealer will perform it as well, typically as part of a tire service or sensor replacement.