General Motors has started a Service Update for certain examples of the 2020 to 2022 model year Cadillac XT4 compact luxury crossover over an issue related to the available diesel engine’s mass airflow sensor.
The problem: in affected vehicles, the engine control module (ECM) may be unable to properly detect so-called “drift” in the mass airflow sensor signal, causing the malfunction indicator lamp to illuminate on the vehicle’s dashboard.
The hazards: this problem can lead to the vehicle’s malfunction indicator lamp, often referred to as an engine light, to illuminate on the dash. This will not lead to an immediate mechanical problem with the engine and does not pose a safety hazard to vehicle occupants, however customers will want to have the service update performed so the engine light no longer stays on.
The fix: dealers will be instructed to reprogram the engine control module. These repairs will be performed at no cost to the vehicle owner.
Affected components: mass airflow sensor, engine control module.
Number of affected vehicles: it’s not clear how many units are affected by this problem. Only European-spec Cadillac XT4 models equipped with the 2.0L LSQ diesel engine are affected by this action.
Owners should: GM will notify owners of affected vehicles and instruct them to make an appointment with their dealer. Owners that are unsure whether or not their vehicle is affected by this service bulletin can reach out to GM directly with any questions or concerns they may have using the Service Update number and contact information included below.
- GM Service Update number: N222358700
- Cadillac Customer Service: 1-800-333-4223