How many open recall and software campaigns currently apply to VIN [VIN], including any cross-platform Ultium campaigns originally issued under GM brands?

Request this answer in writing from the service advisor before authorizing repair work. The full playbook covers documentation procedures and post-service verification steps.

What software versions are currently installed on the relevant modules, and which versions correspond to the closed remedies for each open campaign?

Request this answer in writing from the service advisor before authorizing repair work. The full playbook covers documentation procedures and post-service verification steps.

Has the Honda dealer cross-referenced GM Ultium-platform service campaigns when assessing VIN [VIN]?

Request this answer in writing from the service advisor before authorizing repair work. The full playbook covers documentation procedures and post-service verification steps.

Is each remedy delivered via OTA, dealer-side flash, or hardware adjustment?

Request this answer in writing from the service advisor before authorizing repair work. The full playbook covers documentation procedures and post-service verification steps.

Will all open campaigns be addressed in a single visit, or are sequential visits required?

Request this answer in writing from the service advisor before authorizing repair work. The full playbook covers documentation procedures and post-service verification steps.

app / playbooks / Honda Prologue — software update issue

elevated severity software update issue 2024—2025 dealer

Honda Prologue software update issue (2024—2025)

Honda Prologue · 2024—2025 · all trims

Diagnostic code reference

Reading codes off a Honda Prologue service invoice? Look them up in our OBD-II DTC database →

Reported symptoms

Infotainment screen freezes, reboots unexpectedly, or becomes unresponsive during driving
DC fast charging session refuses to initiate, terminates early, or sustains charge rate well below specification
Cluster, head-up display, or driver-information display flickering, partially blank, or showing intermittent warnings
Backup camera image fails to display, displays late, or appears distorted
HondaLink app reports vehicle errors, shows feature inconsistencies, or reports vehicle as offline
Charging session terminates with high-voltage system error or 'Service charging system' message

Questions to ask

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

How many open recall and software campaigns currently apply to VIN (Vehicle Identification Number) [VIN], including any cross-platform Ultium campaigns originally issued under GM brands?
What software versions are currently installed on the relevant modules, and which versions correspond to the closed remedies for each open campaign?
Has the Honda dealer cross-referenced GM Ultium-platform service campaigns when assessing VIN [VIN]?
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?
Does the Honda dealer service center handling VIN [VIN] have the EV-specific diagnostic equipment and technician training current as of the visit date?

Documents to request

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

Diagnostic report listing all stored, pending, and historical fault codes from the affected modules
Repair order with technician notes, including a list of every recall and campaign reference number addressed during the visit, with cross-platform Ultium references explicitly noted
Written confirmation of software versions installed before and after the visit on each affected module
Written confirmation of which campaigns are now closed for VIN [VIN] following the visit
Written confirmation of the technician's EV-specific certification or training, if applicable to the work performed

Pre-service evidence

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

Screenshot or video-record any infotainment, display, or charging defects at the time they occur
Note specific incidents — system reboots, charging failures, ambient conditions — with dates
Save all Honda correspondence regarding software updates, recalls, or feature delivery timelines
Screenshot the HondaLink app status pages over time, showing any reported errors
Save records from third-party charging network apps showing failed session details
Note odometer reading at drop-off and at pickup

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
The Prologue is Honda's first battery electric vehicle for the US market; some service centers may have limited prior experience with the platform. Confirm in writing that the technician assigned to EV-specific work has appropriate certification.
Cross-platform Ultium campaigns originated under GM brands may apply to the Prologue but require the Honda dealer to actively cross-reference the GM service bulletin database. Verbal statements that 'no campaigns apply' should be confirmed against the cross-platform record before being accepted.
If a Honda dealer indicates the issue requires referral to a different service center with greater EV experience, request written documentation of the referral process and any associated timing

Repair authorization

Cautions before signing.

Recall and software campaign work is performed at no charge to the owner; do not authorize any charge for parts or labor associated with these campaigns
If a diagnostic fee is presented, request written confirmation of whether the fee is refundable if the issue is later determined to be recall- or campaign-covered
If high-voltage component replacement is quoted, request written warranty classification before signing the repair authorization
Honda dealer EV experience varies; if you are uncertain about the dealer's familiarity with the Prologue platform, request a second opinion in writing rather than authorizing complex high-voltage work without confidence

Post-service verification

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

Verify the infotainment system functions normally without unexpected freezes or reboots during a short test drive
Conduct a verified DC fast charging session at a CCS-compatible fast charger before traveling more than a short distance from the dealership
Verify the backup camera image displays immediately upon shifting into reverse, with correct orientation
Confirm no warning messages or system errors on the cluster after a full ignition cycle
Verify the HondaLink app reflects accurate vehicle status with no reported errors
Confirm the repair order lists each closed campaign and any campaigns that remain open

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 — Prologue software, request for written campaign list including cross-platform Ultium references

Service Department, I am scheduling my [YEAR] Honda Prologue, VIN [VIN], for service related to software-based recall campaigns. Before the visit, I am requesting written confirmation of the following: 1. A list of every open recall and service campaign currently applying to VIN [VIN], including any cross-platform Ultium campaigns originally issued under GM brands. 2. Whether all open campaigns can be addressed in a single visit, or whether sequential visits are required. 3. Whether any of the campaigns are being delivered as OTA updates, and if so, whether VIN [VIN] has already received them. 4. Confirmation that the technician assigned to EV-specific work has appropriate Prologue platform training. Please reply to this email so the planned scope is on record. Thank you, [NAME]

documentation request

to: dealer service

Documentation request — Prologue 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 campaign reference number addressed during this visit, including any cross-platform Ultium references. 3. Written confirmation of which campaigns 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. Please reply to this email at your convenience. Thank you, [NAME]

Warranty notes

Honda has issued recalls and service campaigns affecting the Prologue during the early production period. The applicable campaigns for VIN [VIN] should be checked at every service visit, including any cross-platform Ultium campaigns.
Prologue components are covered under Honda's New Vehicle Limited Warranty and the high-voltage battery component warranty (8 years / 100,000 miles in most US markets). Coverage period and conditions should be confirmed in writing.
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

The Honda Prologue is built on GM's Ultium platform under a Honda/GM joint venture. Recall and service campaign coverage for cross-platform defects depends on the Honda dealer system actively cross-referencing GM service bulletins, which does not always happen automatically.

Honda dealer service experience with battery electric vehicles is newer than for hybrid or internal combustion vehicles. Service quality and EV-specific diagnostic capability varies between dealer locations during this transition period.

Multi-campaign software situations are particularly susceptible to incomplete documentation. A general 'software updated' note without enumerated campaign references creates ambiguity about which specific campaigns are closed.

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.

Linked recalls

gm-ultium-fmvss-101-111-305

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