Dodge bulletin 08-399-25
What it saysFlash: Power Inverter Module (PIM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs)… NHTSA’s full summary ↓
Dodge filed this with NHTSA as a service bulletin dated Dec 23, 2025, received Dec 17, 2025, about the electrical system — 2 documents under this number: 08-399-25 REV. A and 1 more. It names 1 model year (2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationFlash: Power Inverter Module (PIM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P2601-00 - Electric Coolant Pump Control Circuit Performance Stuck Off. ● U0623-00 - Lost Communication With Coolant Pump "A". ● P1DBA - Battery Cooling System Failure (Module, Hybrid Control Processor (HCP)). **Customers may experience the following: ● The vehicle is not performing a scheduled cabin preconditioning. 'Cabin Preconditioning Unavailable' message present when the scheduled cabin condition is not performed as planned.** This bulletin involves reprogramming the Auxiliary Hybrid Control Processor (AHCP) and Hybrid Control Processor (HCP) also known as PIM, with the latest available software
Trouble codes it names: P2601 U0623 all 2 read from the document itself; NHTSA’s summary names none
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 08-399-25 REV. A | Service bulletin | Dec 23, 2025 | 11027233 | |
| 08-399-25 | Service bulletin | Dec 12, 2025 | 11026678 |
What the document itself lists
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 18-19-86-92 | Processor, Hybrid Control (HCP/AHCP) - Inspect - Inspect Software Level | 0.2 hrs |
| 18-19-86-BM | Processor, Hybrid Control (HCP/AHCP) - Inspect and Reprogram | 0.5 hrs |
Read by machine from the document NHTSA serves (3 pages), read Sep 30, 2026. A part number is shown only where it matches Dodge’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 1 model year this bulletin names have filed 75 complaints with NHTSA since 2015. 30 of them name Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
Approximately one month after purchasing this vehicle new, I began experiencing a recurring loss-of-propulsion defect. Since XXX, the vehicle has repeatedly lost the ability to accelerate ("limp mode" / "turtle mode") without warning, and later experienced a complete no-start/shutdown failure caused by a PIM/IDCM power electronics…
2024 Dodge Hornet · Electrical System · filed with NHTSA Sep 14, 2026
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group63 other manufacturer communications filed against the Dodge Hornet under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Dodge list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 08-344-26 | Service bulletin | Sep 25, 2026 | Flash: Body Control Module (BCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigati… |
| 08-251-26 | Service bulletin | Sep 25, 2026 | Flash: Body Control Module (BCM) Updates Customers may experience the following: SYMPTOM: ● The battery is depleted, vehicle will not start.… |
| 08-252-26 | Service bulletin | Jun 27, 2026 | Heated Seats and Heated Wheel Turn Off Or Become Disabled Customers may comment on the following: ● Customer may comment that their Heated S… |
| 08-241-26 | Service bulletin | Jun 16, 2026 | Flash: Auxiliary Hybrid Control Processor Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYM… |
| 08-200-26 | Service bulletin | May 5, 2026 | Instrument Panel Cluster (IPC) Content Missing Or Screen Blank Customers may experience the following: ● IPC content missing, display abnorm… |
| 08-148-26 | Service bulletin | Apr 14, 2026 | The following software enhancement is available: ● This software update enables the feature Active Cabin Ventilation (ACV). This bulletin pr… |
| S1408000384 | Service bulletin | Mar 4, 2026 | "Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Messa… |
| S228A000025 REV. A | Service bulletin | Feb 21, 2026 | Harman R1H Uconnect 5 Radio Software Flash Error Codes |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Dodge, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Dodge 08-399-25 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 08-399-25 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 08-399-25 cover?
The manufacturer filed it against 1 model year: 2024 Dodge Hornet. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.