GM Issues a Fix For Defective 2021 Cadillac CT4 Engine Control Modules

The General has published a service advisory outlining a solution for some 2021 Cadillac CT4

small luxury sedans that may be impacted by an inaccurately calibrated Engine Control

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Module (ECM) that is possibly unable to detect and/or identify catalytic converter issues.

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In certain situations, wireless over-the-air upgrades may appropriately recalibrate

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the ECM software without requiring dealer repair, however potentially impacted 2021

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Cadillac CT4 cars should still be checked to confirm the issue has been resolved.

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If there is a defect or failure in the car's catalytic converter in 2021 Cadillac CT4 units

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with an inaccurately calibrated Engine Control Module, many difficulties may occur.

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The ECM may fail to identify the defect by not lighting the Check Engine light,

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may diagnose the catalytic converter problem inaccurately, or may fail to establish

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Diagnostic Trouble Codes (DTCs) so that diagnostic procedures do not discover the error.

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This issue only affects Cadillac CT4 cars powered by the turbocharged 2.0L LSY I4 gasoline engine,

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