Jeep service campaign 66D Combo Rev2
What it saysRevised Customer Satisfaction Notification 66D – Spark Plugs - Dealer Notification NHTSA’s full summary ↓
Jeep filed this with NHTSA as a service campaign dated Oct 7, 2026, received Oct 16, 2026, about the engine — 2 documents under this number. It names 2 model years (2026–2027). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationRevised Customer Satisfaction Notification 66D – Spark Plugs - Dealer Notification
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 66D Combo Rev2 | Service campaign | Oct 7, 2026 | 11038554 | |
| 66D Combo Rev2 | Service campaign | Oct 7, 2026 | 11038517 |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 04275086AE | CUSTOMER SATISFACTION NOTIFICATION | — |
Read by machine from the document NHTSA serves (8 pages), read Oct 18, 2026. A part number is shown only where it matches Jeep’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.
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 2 model years this bulletin names have filed 54 complaints with NHTSA since 2015. 40 of them name Engine — 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.
"I am filing this supplemental report to provide critical new technical information regarding a 2026 Jeep Grand Cherokee Limited Reserve. This vehicle has experienced recurring engine instability, including rough idling, jerking, bucking, and loss of power.
2026 Jeep Grand Cherokee · Engine · filed with NHTSA Oct 19, 2026 · ODI 11771997
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 engine
Source: same model, same component group84 other manufacturer communications filed against the Jeep Grand Cherokee under the same component group (engine), newest first. The eight newest are listed; the rest are on the Jeep list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 09-027-26 | Service bulletin | Oct 17, 2026 | Engine Coolant Leak The customer may comment on the following: SYMPTOM: ● There is an external coolant leak near the exhaust side of the eng… |
| 115202 | Service campaign | Oct 14, 2026 | Revised Customer Satisfaction Notification 66D – Spark Plugs - Dealer Notification |
| 09-013-26 | Service bulletin | Sep 30, 2026 | Engine Runs Rough Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may SYMPTOM: exhibit/set one or m… |
| 09-023-26 | Service bulletin | Sep 25, 2026 | Umbrella Valve Seal Missing From Cylinder Head Cover Vehicle may exhibit a MIL-ON. SYMPTOM: Upon inspection the technician may find that one… |
| S2609000011 | Service bulletin | Sep 11, 2026 | MIL-On and/or Engine Oil Leak |
| 9100363 Rev 3 | Service bulletin | Aug 26, 2026 | Turbocharger Kit Please note many parts of the Turbo Assembly can be serviced separately and complete turbo replacement may not be necessary… |
| ID-26-38 REV.A | Warranty extension | Aug 25, 2026 | ID-26-38 Rev. A Dealer Incentive for the Completion of Customer Satisfaction Notification 66D |
| D-26-18 REV.A | Warranty extension | Aug 25, 2026 | D-26-18 Rev. A Dealer Incentive for the Completion of Customer Satisfaction Notification 66D |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Jeep, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Jeep 66D Combo Rev2 a recall?
No. A service campaign 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 66D Combo Rev2 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does 66D Combo Rev2 cover?
The manufacturer filed it against 2 model years: 2027 Jeep Grand Cherokee, 2026 Jeep Grand Cherokee. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.