General Motors has issued a new Preliminary Service Bulletin in response to customer concerns related to a warning message appearing at startup on certain units of its full-size pickup models, including the Chevy Silverado and GMC Sierra. The message states that the automatic emergency braking system is not available, raising questions from owners. However, GM says that this specific behavior is expected to occur under certain conditions.
According to the service bulletin, tagged as PIT6504, some drivers may see a “Front Collision Not Available” message appear briefly when starting the vehicle. This message is often accompanied by a yellow icon associated with the Automatic Emergency Braking system. In most cases, the alert goes away within a few seconds, although it sometimes remains visible for up to 30 seconds before turning off.
GM states that this behavior is a normal characteristic of the system and does not indicate any error or malfunction. It is assumed that during this short period, the vehicle’s forward-facing safety system is completing its ignition check and calibration. Importantly, no diagnostic trouble codes (DTCs) are stored, and all systems function as intended after the message is cleared.
Because this is considered normal operation, GM recommends that no repair or service action be performed in response to this specific condition. However, the bulletin notes that if there are additional problems, such as a non-working front camera or an active error code, then standard diagnostic procedures should be followed, as those cases are beyond the scope of this particular bulletin.
This bulletin applies to a range of full-size GM pickups, including Chevy Silverado and GMC Sierra models manufactured between the 2022 and 2024 model years in North America, including light-duty and heavy-duty variants equipped with related safety systems.
As a reminder, GM will launch a new generation of light-duty Silverado and Sierra in conjunction with the 2027 model year.
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