The GM 6L80 and 6L90 TEHCM houses the transmission control module (TCM), or computer. The eight solenoids are connected to the TCM via a lead frame, all of which are over-molded in the plastic housing and not accessible or serviceable separately. Component fails and circuit faults in the TEHCM are common, and result in drivability complaints and trouble codes which can only be remedied with a replacement unit.

Sonnax remanufactured TEHCM GM6L-TEHCM-C6 delivers durable, reliable OE performance at a significant savings over an OE replacement. Each unit goes through a rigorous cleaning and inspection process where all failed components are replaced. Electro-hydraulic testing in a simulated drive test ensures full functional performance consistent with a new OE TEHCM. Each TEHCM has the pre-existing VIN cleared and is returned to a blank VIN state for reprogramming by the transmission shop technician for the specific vehicle to which it will be installed.

The fully tested TEHCM is serialized, and the test data stored and packaged in mylar bag with a protective connector cover to prevent inadvertent static discharge issues during the shipping, handling and receiving processes.

• Ultrasonically cleaned and thorough flushing of solenoids to remove all dirt and debris — no matter how hidden
• New pressure switches installed
• New filter plate/screen installed
• Fully electro-hydraulically tested to comply with OE performance
• VIN-blanked for programming to any applicable vehicle