Seeing a “Service Brake System” message on your dashboard is enough to make any driver panic. However, General Motors has recently released information showing that this scary warning might not actually be a mechanical brake failure.

According to GM Service Bulletin PIT6476A, published in March 2026, the root cause is often just a simple electrical or battery problem. If you drive a 2022 to 2026 Chevrolet Silverado 1500, GMC Sierra 1500, GMC Yukon, or Cadillac Escalade, here is exactly what you need to know about this frustrating issue.

The Warning Signs and Symptoms

Owners of affected vehicles might experience a few different symptoms. You may see warning lights for the ABS or the Service Engine Soon indicator. Your dashboard screen could also display a “Service Brake System” or “Service StabiliTrak” message. In some cases, drivers might even notice a physical change in the amount of effort required to push the brake pedal.

When a technician scans the vehicle for diagnostic trouble codes, they will typically find code C055F stored in the Brake System Control Module. Interestingly, GM notes that for 2026 full-size SUVs like the Escalade and Yukon, the system will set code C0597 instead.

A screenshot of General Motors Service Bulletin PIT6476A, showing the affected 2022 to 2026 Chevrolet, GMC, and Cadillac vehicles and stating that the Service Brake System warning can be caused by a low voltage condition.
Official documentation from GM confirms that a “Service Brake System” or “Service StabiliTrak” message, along with codes C055F or C0597, can be triggered by a simple low voltage issue.

Which Vehicles Are Affected?

This issue impacts a wide range of popular Chevrolet, GMC, and Cadillac vehicles built between 2022 and 2026. While the bulletin does not apply to the heavy-duty Chevrolet Silverado HD or GMC Sierra HD, it covers nearly every major light-duty truck and full-size SUV in the lineup.

If you drive a modern Chevrolet Silverado or GMC Sierra, your vehicle may be on the list. The specific affected models include:

The Surprising Cause: Low Voltage

While the dashboard points to a brake issue, GM states that this condition could actually be caused by a low voltage situation. A weak battery or a poor electrical connection can trigger these brake system errors.

If your dealership cannot find a mechanical root cause, the bulletin instructs technicians to perform a series of electrical checks. Mechanics are told to inspect the battery, battery cables, and fuse blocks to ensure all connections are clean and tight. They must also check the power and ground terminals for the Brake System Control Module to ensure they are not loose or backing out.

Additionally, GM advises technicians to look for any aftermarket equipment that could drain the battery, such as dash cameras or cell phone chargers. Doing a parasitic draw test and testing the charging system can also help pinpoint the electrical drain causing the low voltage. Testing the battery at the ambient temperatures where the issue occurs is also recommended.

What You Should Do Next

If your vehicle is displaying these warnings, you should schedule a service appointment right away. You can mention Preliminary Information bulletin PIT6476A to your service advisor to help them diagnose the problem faster. If your truck is still under the Bumper-to-Bumper warranty, the required electrical testing is covered under a specific labor operation code.

Are you dealing with phantom brake warnings on your truck or SUV? Head over to the GM-Trucks.com Forums to share your experience. You can join the conversation in our 2019-2026 Silverado 1500 & Sierra 1500 forum or drop into the 2021-2026 Tahoe, Suburban, Yukon, and Escalade forum to connect with other owners.