NHTSA service bulletin

NHTSA Service Bulletin 10177433: 2020, 2021 Keystone Montana

Official manufacturer communication context for 2020, 2021 Keystone Montana, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10177433 summary graphic for 2020, 2021 Keystone Montana
10177433NHTSA document ID
Technical service bulletincommunication type
2affected product rows
90/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

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 Cl 114, 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 Cl 114. 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.

What this bulletin may mean before buying

Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.

Affected products listed in this communication

MakeModelModel yearsBuyer note
KeystoneMontana2020Ask for service records and run the exact VIN before purchase.
KeystoneMontana High Country2021Ask for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 10177433?

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.

Is a service bulletin the same as a recall?

No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.

How should a used-car buyer use this bulletin?

Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.

Check the exact VIN before you buy

Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.

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