# Service bulletin PIC6446A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10204451
- Published by NHTSA: 2021\-12\-13
- Manufacturer's number: PIC6446A
- Manufacturer's date: 2021\-11\-15
- NHTSA component: FORWARD COLLISION AVOIDANCE; VEHICLE SPEED CONTROL; TIRES; PARKING BRAKE; LANE DEPARTURE

## NHTSA's summary

This Preliminary information communicates to the dealer if the lane keep assist and forward collision alert are inoperative, both indicators may be flashing on and off while driving. When pressing button to turn on the lane keep assist they receive a message stating the system is not available. If the above conditions are met to verify that all of the tires are the correct size as per vehicle build. If an incorrect tire side if found on the vehicle it will cause a wheel speed discrepancy on straight road travel that will disable all driver assistance \(Front Camera Module\) systems relying on wheel speed sensor data inputs. LKA ? Lane Keep Assist LDW ? Lane Departure Warning FCA ? Forward Collision Alert LSCMB ? Low Speed Collision Mitigation Braking \(RPO\-UHY\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204451-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204451-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Driver assistance, Throttle and cruise control, Tires, Parking brake

## Vehicles listed

- 2020 to 2022 BUICK ENCORE GX
- 2021 to 2022 CHEVROLET TRAILBLAZER

## Other bulletins for the same vehicles and component

- [22\-NA\-051](/bulletins/10209396.md), 2022-03-30, Service bulletin: PARKING BRAKE; EQUIPMENT; ELECTRICAL SYSTEM. This informational bulletin provides information for dealers/technicians on Changes to Park Assist and Reverse Automatic Braking for Certain 2022 Passenger Car, Crossover, SUV, and Truck Models Equipped with RPO 00Y and/or 00Z.
- [21NA016](/bulletins/10194092.md), 2021-05-24, Service bulletin: EXTERIOR LIGHTING; PARKING BRAKE. This service bulletin provides a procedure to locate and repair a possible loose wire crimp in the engine wiring harness to correct a customer concern of a Malfunction Indicator Lamp \(MIL\) Illuminated.
- [20NA186](/bulletins/10181712.md), 2020-10-26, Service bulletin: PARKING BRAKE:ELECTRICAL. This technical bulletin provides repair information to correct a customer concern of an Unwanted Electric Park Brake Setting.

JSON: [/v1/bulletins/10204451](/v1/bulletins/10204451)

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