What does the TC/slash yellow light on the Buick Regal indicate?
4 Answers
The "TC" indicator light on the dashboard corresponds to the Traction Control System, also known as the Track Control System. The reasons for this light to illuminate are as follows: 1. It may be due to accidentally touching the traction control switch next to the gear shift lever, turning off the traction control system. 2. A malfunction in the traction control system. The causes of traction control system failure are as follows: 1. Solenoid valve failure. 2. Dirty engine oil clogging the solenoid valve filter screen. 3. Wear and tear on the actuator gear and impeller causing oil pressure leakage and triggering the alarm. 4. Dirty throttle body with an opening reaching 20%, causing the engine computer to misjudge a TC fault.
I just encountered this issue a couple of days ago. While driving, I noticed the steering wheel felt heavier, and suddenly a yellow TC with a slash light appeared on the dashboard. After consulting a mechanic, I learned that this indicates the Traction Control System is either turned off or malfunctioning. For the Buick Regal, there are several common reasons for this light to come on: you might have accidentally pressed the TC off button on the center console; the system could be giving false alarms due to excessive intervention on slippery rainy roads; or the wheel speed sensors might be covered in mud. I wiped the sensor areas on the inner side of all four wheels with a damp cloth, and the light was off the next day when I started the car. If it doesn't go away, then it's necessary to visit the dealership to check the control module, as this system is crucial for preventing skids during turns and ensuring safety.
When I was driving my Buick Regal on the highway, the TC yellow warning light came on, which scared me into slowing down and pulling over immediately. Experience tells me that this light usually indicates either a system malfunction or manual deactivation. The most common cause is accidentally pressing the traction control button near the glove compartment—just check the button position to confirm. If the button hasn’t been touched and the light remains on, it’s likely a sensor issue—either a loose ABS sensor wiring harness connector in the tire or worn wheel hub bearings interfering with signal transmission. Last time, my issue was a corroded front-right wheel sensor plug due to water seepage, which was fixed by replacing it for 200 yuan. I suggest not taking it lightly, especially when driving on mountain roads with the light on, as the rear wheels are prone to skidding or fishtailing.
As a long-time Buick driver, I'm all too familiar with the TC/slash yellow light. This indicator shows the working status of the Traction Control System. If it lights up yellow during normal driving, first check if you've pressed the Traction Control button near the gear lever. If the light comes on without pressing the button, you'll need to investigate three possibilities: poor contact in the wheel speed sensor (especially after driving on rough roads), moisture-induced short circuits in the control module circuit, or abnormal wheel speed data caused by uneven tire wear. My neighbor's car had this issue when the sensor wire got loose during wheel modification - simply reconnecting it fixed the problem.
