P15F8 2017 GMC Sierra Code - Automatic Braking Engine Torque Request Signal Message Counter Incorrect

P15F8 indicates an issue with the Automatic Braking Engine Torque Request Signal Message Counter, which is related to communication errors between the braking and engine control modules.

Symptoms may include the check engine light or service brake warning light turning on, reduced braking performance, or the automatic braking system not functioning properly.

Common causes include a malfunctioning brake control module, a faulty engine control module, wiring or connection issues, or outdated software in one of the modules.

While the vehicle may still be drivable, it is not recommended as the automatic braking system may not function properly, potentially compromising safety.

A technician will use a scan tool to check for related codes, inspect wiring and connections between the modules, and test the communication signals for accuracy.

Repairs may involve reprogramming or updating the brake or engine control module software, repairing or replacing damaged wiring, or replacing a faulty control module.

Repair costs can vary, but diagnostics typically range from $100 to $200, with additional costs depending on whether a module repair or replacement is needed.

It may be covered if your vehicle is still under the powertrain or emissions warranty. Check with your dealership for specific coverage details.

A weak or dead battery can sometimes cause communication errors between modules, potentially triggering the P15F8 code.

While independent repair shops may be able to fix the issue, a dealer may be better equipped to handle software updates or module replacements specific to GMC vehicles.