Kia bulletin PI1802YZ_TSB_R5
What it saysPRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802Y/Z) - This bulletin has been revised to include additional information. NHTSA’s full summary ↓
Kia filed this with NHTSA as a service bulletin dated Mar 22, 2024, received Apr 7, 2020, about the engine — 9 documents under this number: PI1802YZ_TSB_R7, PI1802YZ_TSB (2 filings), PI1802YZ_TSB_R6, PI1802YZ_TSB_R4 and 4 more. It names 11 model years (2016–2020). 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.
Get the next Kia bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
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.
PRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802Y/Z) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information related to the Technical Service Bulletin previously published in July 2018 (PI1802 Rev 10, 03/16/2020) titled “Knock Sensor Detection System - ECU Logic Improvement” equipped w/THETA II engine. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below returns to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Range/Performance).
Trouble codes it names: P1326
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PI1802YZ_TSB_R7 | Service bulletin | Mar 22, 2024 | 10252085 | PDF, 2,905 KB |
| PI1802YZ_TSB | Service bulletin | Aug 31, 2023 | 10241862 | PDF, 1,422 KB |
| PI1802YZ_TSB_R6 | Service bulletin | Dec 23, 2021 | 10205865 | not found |
| PI1802YZ_TSB_R5 | Service bulletin | Nov 4, 2021 | 10203658 | PDF, 2,823 KB |
| PI1802YZ_TSB_R4 | Service bulletin | Nov 12, 2020 | 10183312 | PDF, 4,356 KB |
| PI1802YZ_TSB_R3 | Service bulletin | Jul 1, 2020 | 10177731 | not found |
| PI1802YZ_TSB_R2 | Service bulletin | Jun 9, 2020 | 10177730 | not found |
| PI1802YZ_TSB_R1 | Service bulletin | Apr 9, 2020 | 10174429 | not found |
| PI1802YZ_TSB | Service bulletin | Mar 17, 2020 | 10173256 | not found |
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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the cooling system for the 2020 Optima →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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.
Email me new Kia bulletins for one of these models
A weekly email, sent only in a week when Kia files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 11 model years this bulletin names have filed 4,673 complaints with NHTSA since 2015. 3,200 of them name Engine, 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.
On the 2016 Kia Sorento, the 202 owners who gave an odometer reading for Engine reported it at a median of 85,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I've had this car going on three years sometimes not all the time I will go to start it and it will barely start so I took it to the dealership three times when I got my oil change and they checked the battery but they're saying the battery is good and the starting system the car will just be sitting in my garage and I try to start it it…
2019 Kia Optima · Electrical System · filed with NHTSA May 9, 2021
I was driving back home I had too work in rodeo california half the way everything was going great I had my 3 children with me my car didn't gave me any warning no check engine light.,no white smoke , I was passing the dodger stadium when suddenly my 2018 Sorento just shut down almost got hit I was about too enter the 710 and nooooo I…
2018 Kia Sorento · Engine · filed with NHTSA Aug 26, 2019
The contact owns a 2018 Kia Optima PHEV. The contact's daughter stated that while driving at an undisclosed speed, the high systems temperature switching to hybrid mode message was displayed. The contact stated that there was a two-hour delay for a full charge. The vehicle was taken to the dealer but was not diagnosed or repaired.
2018 Kia Optima · Electrical System · filed with NHTSA Jul 21, 2025
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 PI1802YZ_TSB_R5 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 PI1802YZ_TSB_R5 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 PI1802YZ_TSB_R5 cover?
The manufacturer filed it against 11 model years: 2020 Kia Optima, 2019 Kia Optima, 2018 Kia Optima, 2017 Kia Optima, 2016 Kia Optima, 2018 Kia Sorento and more. 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: 2014 Optima (TF) 2.4L GDI: built 29 Aug 2013 – 25 Apr 2014; 2015-2018 Optima (TF/QF/JF/JFa) 2.4L &: built 16 Apr 2014 – 11 Jul 2018; 2014-2018 Sportage (SL/QL) 2.4L & 2.0L: built 30 Sep 2013 – 5 Apr 2018 — the build date is on the certification label in the driver’s door jamb.