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SERVICE BULLETIN #010
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Date: May 28, 2020
Subject: Controller Compatibility with DX Series Electric/Hydraulic Actuators
Dexter and General Motors have identified a compatibility issue between the GM Integrated Trailer Brake Controller used in newer GM
models and various Electric/Hydraulic Actuators, including the Dexter DX Series. This issue was discovered as the newest GM Integrated
Trailer Brake Controller entered the market.
This compatibility issue can occur during startup as the driver applies the brake for the first time. The driver will receive an in-dash
notification of a brake controller fault when applying the brake. When seeing the notification, the driver should not tow the unit. GM released
service bulletin DTC C1114, which outlines the issue in greater detail, including the proper use of a trailer mounted brake adapter to resolve
the issue.
This is a non-moving event as the vehicle requires the brake to be depressed to move the vehicle out of Park. This condition creates a fault in
the GM Integrated Trailer Brake Controller, resulting in no trailer brakes. If no in-dash notification is received, the combination is compatible.
As part of the solution recommended by General Motors, Dexter part number K58-036-00 (E/H Compatibility Adapter) has been developed
by Dexter Engineering and tested by both Dexter and GM Engineering. The Dexter E/H Compatibility Adapter will be available July 2020. The
adapter was not available prior to release of the GM DTC C1114.
Although GM service bulletin DTC C1114 identifies Dexter Actuator serial numbers with prefixes TCV, TCB and CBH; Dexter recommends
reviewing all Electric/Hydraulic actuators for proper function prior to towing, regardless of the serial number, make or model.
Please contact Dexter or your local GM dealer for further information.
Mark Nave
Market Manager
Dexter Axle Company
Phone: (574) 295-7888
2900 Industrial Parkway East
www.dexteraxle.com
Elkhart, IN 46516
Fax: (574) 295-8666