U2628 GMC Code - Reductant Control Module Lost Communication With Reductant Concentration Sensor

The common symptoms of code U2628 include the check engine light turning on, reduced engine performance, and potential issues with the vehicle's emissions system.

This code indicates a communication problem between the reductant control module and the reductant concentration sensor in the vehicle's emissions system.

Some possible causes of this code include faulty wiring or connections between the control module and sensor, a malfunctioning sensor, or issues with the control module itself.

Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connections between the control module and sensor, and testing the sensor for proper functionality.

Repairing this code may involve repairing or replacing damaged wiring or connectors, replacing the reductant concentration sensor if faulty, or reprogramming the control module if needed.

It is generally not recommended to drive the vehicle with this code present, as it can lead to reduced engine performance and potential issues with the emissions system.

While it is possible to clear the code temporarily, it will likely return if the root cause of the communication problem between the control module and sensor is not addressed.

The cost of repairing this code can vary depending on the specific cause of the issue, the extent of the repairs needed, and whether any parts need to be replaced. It is recommended to consult with a mechanic for an accurate estimate.

While not as common as some other OBDII codes, U2628 can occur in GMC vehicles, particularly in models equipped with reductant control systems for emissions compliance.

Regular maintenance, such as checking and maintaining the emissions system components, keeping up with scheduled inspections, and addressing any warning lights promptly, can help prevent this code from appearing.