Kia bulletin PI1805YZ
What it saysThis bulletin provides information related to the Technical Service Bulletin previously published in (PI1805) titled "Knock Sensor Detection System - ECU Logic Improvement" for certain 2019MY Optima (JFa), Sorento (UMa)… NHTSA’s full summary ↓
Kia filed this with NHTSA as a service bulletin dated Jan 12, 2024, received Feb 2, 2024, about the engine — 1 document under this number: PI1805YZ_TSB. It names 3 model years (2019). 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT (PI1805Y/Z) - This bulletin provides information related to the Technical Service Bulletin previously published in (PI1805) titled "Knock Sensor Detection System - ECU Logic Improvement" for certain 2019MY Optima (JFa), Sorento (UMa) and Sportage (QL) vehicles equipped with a 2.4L GDI or 2.0L T-GDI engine. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below return to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Range/Performance).
Trouble codes it names: P1326
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PI1805YZ_TSB | Service bulletin | Jan 12, 2024 | 10249001 | PDF, 1,447 KB |
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 3 model years this bulletin names have filed 709 complaints with NHTSA since 2015. 301 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.
On the 2019 Kia Sorento, the 48 owners who gave an odometer reading for Engine reported it at a median of 83,537 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I purchased on my 2019 Kia Optima on 6/19. And since then off and on the car has experience intermittent starting issues. Now I have taken the car to two different dealers and neither one can find the problem. When pressing the stop/start button the car would hesitate to start no lights or codes are stored in the computer.
2019 Kia Optima · Engine · filed with NHTSA Nov 30, 2020
Purchased car in jan 2019. Car studders on acceleration of car under all conditions. Acceleration is always rough. Two time and several calls to dealer has been of no help. I keep getting told by dealer that Kia is working on software fix for the problem and that all Kia sorento's have same problem
2019 Kia Sorento · Engine · filed with NHTSA Sep 27, 2019
My vehicle keeps stalling and its been having an oil consumption problem for several months. I keep taking it to kia, they keep doing oil consumption tests. I'm afraid to drive my vehicle anymore. I had an oil change done one month 3k miles later she was out of oil
2019 Kia Sportage · Engine · filed with NHTSA Jul 6, 2023
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 group21 other manufacturer communications filed against these Kia models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Kia list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PI2108 | Service bulletin | Apr 15, 2026 | PRODUCT IMPROVEMENT CAMPAIGN NU 2.0L GDI - KNOCK SENSOR DETECTION SYSTEM (KSDS) ECU LOGIC IMPROVEMENT (PI2108) - This bulletin provides info… |
| SC340 | Emissions | Apr 4, 2026 | VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS: ECM LOGIC IMPROVEMENT (SC340 REVISION 5) - This bulletin has been revised… |
| CA2516 | Service bulletin | Apr 1, 2026 | TECHNICAL SERVICE BULLETIN: CUSTOMER ACTION: ECU LOGIC IMPROVEMENT FOR DTC P2B59F0 (CA2516) - This bulletin provides information to upgrade… |
| WTY026_QA | Service bulletin | Mar 18, 2026 | TECHNICAL SERVICE BULLETIN: OIL PRESSURE SWITCH (OPS) REPLACEMENT - This bulletin has been revised to include additional information. New/re… |
| PI2104 | Service bulletin | Mar 18, 2026 | PRODUCT IMPROVEMENT CAMPAIGN: THETA 2.4L MPI - KNOCK SENSOR DETECTION SYSTEM (KSDS) ECU LOGIC IMPROVEMENT (PI2104) - This bulletin provides… |
| DC26 | Service campaign | Feb 10, 2026 | TECHNICAL SERVICE BULLETIN: DATA COLLECTION: EXTRACT CALIFORNIA EMISSIONS DATA FROM ECU (DC26) - This bulletin has been revised to include a… |
| CA2508 | Service bulletin | Dec 8, 2025 | TECHNICAL SERVICE BULLETIN: ITM REPLACEMENT AND ECM & TCM LOGIC IMPROVEMENT (CA2508) - This bulletin provides information to replace the Int… |
| SC320 | Emissions | Nov 20, 2025 | TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: EGR VALVE ASSEMBLY REPLACEMENT (SC320) - This bulletin has been revised to… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Kia, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kia PI1805YZ 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 PI1805YZ 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 PI1805YZ cover?
The manufacturer filed it against 3 model years: 2019 Kia Optima, 2019 Kia Sorento, 2019 Kia Sportage. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: Optima (JFa): built 21 May 2018 – 28 Feb 2019; Sorento (UMa): built 22 Jan 2018 – 6 Mar 2019; Sportage (QL): built 2 Apr 2018 – 14 Jan 2019 — the build date is on the certification label in the driver’s door jamb.