A faulty or malfunctioning transmission can trigger the check engine light for a handful of reasons, including things like an overheating gearbox or issues with the transmission control module (TCM).

The engine control module, or ECM, controls plenty of functions during routine driving, so any issues with that part could cause severe problems.

Fix a Bad Engine Coolant Temperature Sensor See the crack? This sensor didn’t set off a trouble code or “check engine” light. But the owner had to pump the pedal to keep the engine running.

GM has issued a recall for certain examples 2021 to 2023 Chevy Trailblazer due to an issue related to the engine control module.