GMC Hummer EV software update issue (2022–2024)

GMC Hummer EV · 2022–2024 · all trims

Reported symptoms

Cluster, infotainment, or HUD displays missing labels, incorrect labels, or non-compliant indicators
Backup camera image fails to display, displays late, or appears distorted
Required electric-vehicle warning indicators not displaying or not behaving per regulation
Manufacturer correspondence regarding FMVSS (Federal Motor Vehicle Safety Standard)-related software recall
Multiple recall campaigns referenced in service notifications, covering different display or labeling functions
myGMC app reports vehicle errors related to display systems

Questions to ask

Pose these to the service advisor at intake. Request answers in writing or via email.

How many open recall campaigns related to FMVSS compliance currently apply to VIN (Vehicle Identification Number) [VIN], and which display or labeling function does each address?
What software versions are currently installed on the relevant modules, and which versions correspond to the closed remedies for each open campaign?
Is each remedy delivered via OTA (Over-the-Air software update), dealer-side flash, or hardware adjustment?
Will all open campaigns be addressed in a single visit, or are sequential visits required?
Will the repair order list each recall campaign reference number applied during the visit and confirm closure for each?
Are there related campaigns affecting other GM Ultium-platform vehicles that should be cross-referenced for this build?

Documents to request

Each item should be received in writing before authorizing repair work.

Diagnostic report listing all stored and pending fault codes from the affected modules
Repair order with technician notes, including a list of every recall campaign reference number addressed during the visit
Written confirmation of software versions installed before and after the visit on each affected module
Written confirmation of which recalls are now closed for VIN [VIN] following the visit
Schedule of any remaining open campaigns and the expected timeline for their remedy

Pre-service evidence

Capture before drop-off. Once the vehicle leaves your possession, proving prior condition becomes significantly harder.

Photograph or video-record any display defects at the time they occur — missing labels, incorrect indicators, camera display failures
Note specific incidents — date, vehicle state, what the system was attempting at the time — for the service record
Save all GM and dealer correspondence regarding the FMVSS recalls
Screenshot the myGMC app status pages over time, showing any reported errors
Note odometer reading at drop-off and at pickup
If multiple service visits are required, retain documentation from each visit as part of a complete record

Service advisor interaction

Operational notes specific to the conversation at the service desk.

Record the full name of the service advisor and the technician performing the work
FMVSS-related compliance defects produce multiple distinct campaign references. A general 'FMVSS update completed' statement does not document which specific campaigns are closed.
Note whether each campaign is classified as a recall, a customer satisfaction program, or a service bulletin — these classifications carry different documentation and warranty implications
If the advisor states that an OTA update has been delivered for VIN [VIN] but the vehicle still shows the affected behavior, request written documentation of the diagnostic steps taken before any release

Repair authorization

Cautions before signing.

Recall remedies are performed at no charge to the owner; do not authorize any charge for parts or labor associated with the documented FMVSS recalls
GMC dealers may schedule recall remedies across multiple visits for parts availability or technician scheduling reasons; this is acceptable but should be documented through correspondence retention rather than verbal commitments
If a diagnostic fee is presented for issues the dealer characterizes as unrelated to the open recalls, request written documentation distinguishing recall-related and unrelated faults before authorization
Repair authorization signatures often include language permitting additional related work — read the document and decline blanket additional work in advance

Post-service verification

Complete before leaving the service location. Issues that surface after departure are operationally harder to attribute to the visit.

Verify the cluster, infotainment, and HUD display labels and indicators are present and behave per regulation
Verify the backup camera image displays immediately upon shifting into reverse, with correct orientation
Confirm no warning messages or system errors on the driver-information display after a full ignition cycle
Verify the myGMC app reflects accurate vehicle status with no display-related errors
Confirm the repair order lists each closed FMVSS recall campaign and any campaigns that remain open
Retain copies of all post-repair documentation, particularly any open-campaign tracking

Email templates

Documentation-focused templates for service correspondence. Tap copy to use. Subject and body are kept verbatim — paste them as-is into your email client.

pre-service inquiry

to: dealer service

Service inquiry — Hummer EV FMVSS recall, request for written campaign list and scope

Service Department, I am scheduling my [YEAR] GMC Hummer EV, VIN [VIN], for service related to FMVSS-based recall campaigns. Before the visit, I am requesting written confirmation of the following: 1. A list of every open recall campaign currently applying to VIN [VIN], including the campaign reference number and a brief description of the FMVSS standard or function addressed by each. 2. Whether all open campaigns can be addressed in a single visit, or whether sequential visits are required, and the reason if the latter. 3. Whether any of the campaigns are being delivered as OTA updates, and if so, whether VIN [VIN] has already received them. 4. The expected duration of the service and any loaner vehicle arrangement. Please reply to this email so the planned scope is on record. Thank you, [NAME]

documentation request

to: dealer service

Documentation request — Hummer EV FMVSS recall service on [DATE], VIN [VIN]

Service Department, Following the service performed on [DATE] for VIN [VIN], I am requesting the following documents for my ownership records: 1. The full diagnostic report including all stored, pending, and historical fault codes. 2. The repair order listing every FMVSS recall campaign reference number addressed during this visit. 3. Written confirmation of which recalls are now closed for this VIN and which remain open. 4. Written confirmation of the software versions installed on each affected module before and after the visit. These documents form part of the vehicle's service record and are operationally important across multiple visits. Please reply to this email at your convenience. Thank you, [NAME]

Warranty notes

GM has issued multiple FMVSS-related recalls and service campaigns affecting Ultium-platform vehicles. The applicable campaigns for VIN [VIN] should be checked at every service visit.
Software-only remedies do not consume warranty time; the standard New Vehicle Limited Warranty period continues independently of recall remedies.
Recall remedies are performed at no charge to the owner regardless of vehicle age, mileage, or warranty status. A recall remains open until performed.
Repairs performed under goodwill rather than warranty or recall do not extend the warranty period. Confirm in writing which classification applies.

Observational patterns

FMVSS-related recalls span three distinct standards (101 Controls and Displays, 111 Rear Visibility, 305 Electric Vehicle Safety) and may be addressed through separate campaigns. Single-campaign coverage may not capture all relevant remedies.

Cross-platform software defects across the GM Ultium platform have produced parallel campaigns affecting Hummer EV, Cadillac Lyriq, Chevrolet Blazer EV, Chevrolet Equinox EV, Chevrolet Silverado EV, and other related vehicles. Single-vehicle campaign coverage may not capture all relevant remedies for shared software stacks.

OTA delivery does not always produce a corresponding entry in the dealer-side service record. The closure of a recall delivered over the air requires explicit documentation through the dealer system, not the OTA install message alone.

FMVSS-classified recalls are safety-classified rather than convenience-classified. The regulatory basis affects how the campaign is documented and may matter for resale documentation in regions with annual safety inspections.

Linked recalls: gm-ultium-fmvss-101-111-305

All rated vehicles