GM has issued a service bulletin for a reflashing of the Engine Control Module (ECM) in certain units of the 2021 to 2023 Chevy Trailblazer.
The problem: affected units may be unable to clear the status of the DTC P0521 (Engine Oil Pressure Sensor Performance) trouble code. If the ECM previously set this trouble code, the affected vehicle may be unable to pass Emission Inspection/Maintenance (I/M) testing.
The fix: owners of affected vehicles are to bring their vehicles to the dealership to have a certified GM technician inspect the code and reprogram the ECM as necessary.
Affected components: engine control module (ECM).
Affected vehicles:
- 2020 to 2023 Buick Encore GX
- 2021 to 2023 Chevy Trailblazer
Number of affected vehicles: it’s unclear at this time how many vehicles are affected by this issue.
Owners should: bring their vehicles into the dealership to have the ECM reflashed.
Contacts:
- Chevy Customer Service: 1-800-222-1020
- Customer Satisfaction Program Number: A222379710
As a reminder, the Chevy Trailblazer is offered with two engine choices. First up is the turbocharged 1.2L inline three-cylinder LIH gasoline engine, which produces 137 horsepower and 162 pound-feet of torque. This is followed by the turbocharged 1.3L inline three-cylinder L3T gasoline engine, which produces 155 horsepower and 174 pound-feet of torque.
As for transmission options, LIH engine connects to GM’s continuously variable automatic transmission, while the L3T powerplant is mated to either the CVT the GM nine-speed automatic transmission.
Under the skin, the Trailblazer rides on the GM VSS-F vehicle set. In regards to manufacturing, the 2023 model began production on April 24th at the GM Bupyeong plant in Bupyeong-gu, Incheon, South Korea. The Trailblazer is also built at the GM China Dong Yue plant in Yantai, Shandong, China.
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