GM 10-Speed Transmission Issue – Investigation Alert (Short)

We are investigating reported concerns involving certain General Motors vehicles equipped with 10-speed automatic transmissions (model years approximately 2018–present) relating to harsh shifting, hesitation, and loss of power. If your vehicle is affected, you may contact us confidentially and free of charge. No lawsuit has been filed and no class proceeding has been certified in British Columbia.

GM 10-Speed Transmission Issue – Investigation (Detailed)

Our firm is reviewing reported concerns involving General Motors vehicles equipped with 10-speed automatic transmissions (10L series), including vehicles from approximately the 2018 model year onward, where owners have experienced drivability and transmission performance issues.

Reports reviewed to date describe symptoms such as harsh or erratic shifting, delayed engagement, shuddering, slipping, hesitation, and inconsistent acceleration or deceleration. In some cases, these issues may persist despite multiple dealership visits or attempted repairs.

At this stage, no lawsuit has been filed, and no class proceeding has been certified in British Columbia. This review remains preliminary.

Potential Automotive Class Proceeding Under Investigation:
GM 10-Speed Transmission Defect – 2018–Present Chevrolet, GMC, and Cadillac Vehicles

Our firm is currently investigating a potential Canada-wide class proceeding, including in British Columbia, concerning General Motors vehicles equipped with 10-speed automatic transmissions (10L60, 10L80, 10L90, and 10L1000).

Based on available information, affected vehicles may include, but are not limited to:

Chevrolet

−      Chevrolet Silverado 1500 – 2019–present

−      Chevrolet Silverado 2500HD / 3500HD – 2020–present

−      Chevrolet Tahoe – 2018–present

−      Chevrolet Suburban – 2019–present

−      Chevrolet Camaro (select trims) – 2019–2024

GMC

−      GMC Sierra 1500 – 2019–present

−      GMC Sierra 2500HD / 3500HD – 2020–present

−      GMC Yukon / Yukon XL – 2018–present

Cadillac

−      Cadillac Escalade / Escalade ESV – 2018–present

−      Cadillac CT4 / CT5 / CT6 (select trims) – 2019–present

(Exact inclusion may vary based on engine and transmission configuration.)

Reports reviewed to date suggest that certain transmissions may exhibit a common defect affecting the coordination of internal components and control systems, resulting in inconsistent or unreliable shift behavior.

Reported manifestations include:

−      Harsh, abrupt, or erratic shifting, including banging or clunking

−      Delayed or hesitant acceleration, particularly from a stop

−      Shuddering, slipping, or gear hunting

−      Unexpected surging or lunging

−      Loss of propulsion or reduced power

In some reported cases, these issues may escalate to sudden loss of drive power or momentary wheel lock-up during certain driving conditions, which may increase the risk of a collision.

Available information indicates that manufacturer responses have included technical service bulletins, software updates, and component replacements, including valve body and control system modifications. However, reported outcomes may vary and may not provide a permanent resolution in all cases.

This investigation is ongoing and is being conducted to determine whether the legal requirements under British Columbia’s Class Proceedings Act are met, including whether common issues exist and whether a class proceeding would be the preferable procedure.

If you own or lease a GM vehicle equipped with a 10-speed transmission and have experienced persistent shifting issues, hesitation, or loss of power, you may contact us to share your experience. Providing information is confidential, free of charge, and does not obligate you to retain our firm or participate in any legal proceeding.

This page will be updated as our investigation progresses.

This webpage is provided for informational purposes only and does not constitute legal advice.

Frequently Asked Questions – GM 10-Speed Transmission Investigation 

What issue is being investigated?
We are reviewing reports that certain GM vehicles equipped with 10-speed automatic transmissions may experience drivability and shifting issues affecting performance and reliability.

Has a class proceeding been filed?

No. This is a preliminary investigation only. No Notice of Civil Claim has been filed and no class proceeding has been certified in British Columbia.

What does “certification” mean?

Certification is a procedural step where a court determines whether a lawsuit may proceed as a class proceeding. It does not determine liability or damages.

Which vehicles are included?

The investigation concerns certain 2018–present Chevrolet, GMC, and Cadillac vehicles equipped with 10-speed transmissions, including Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, and certain sedan and performance models. The scope may evolve as more information becomes available.

What symptoms have been reported?

Reported symptoms include harsh shifting, hesitation, delayed engagement, shuddering, loss of power, and unexpected vehicle behavior.

Has GM proposed a remedy?

Manufacturer responses have included service bulletins, software updates, and component replacements. However, based on available information, outcomes may vary and may not fully resolve the issue in all cases.

How can I provide information?

If you own or lease an affected vehicle and have experienced transmission-related issues, you may contact us to share your experience. This is confidential, free of charge, and does not obligate you to participate in any legal proceeding.

Will I automatically be part of a class proceeding if one is certified?

If a class proceeding is certified, individuals who fall within the defined class are typically included automatically unless they choose to opt out, subject to the court’s order.