Kia bulletin PI2104
Kia filed this with NHTSA as a service bulletin dated Mar 18, 2026, received Aug 2, 2021, about the engine and engine cooling — 7 documents under this number: PI2104_OWNR_501, PI2104_OWNR_401, PI2104_OWNR_301, PI2104_OWNR_201 and more. It names 1 model year (2016). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationPRODUCT IMPROVEMENT CAMPAIGN: THETA 2.4L MPI - KNOCK SENSOR DETECTION SYSTEM (KSDS) ECU LOGIC IMPROVEMENT (PI2104) - This bulletin provides information related to a software update to the Engine Control Unit (ECU) to install the Knock Sensor Detection System (KSDS), in order to protect the engine from excessive connecting rod bearing damage. This update is for certain 2014-2016MY Optima Hybrid (TF HEV) vehicles equipped with Theta 2.4L MPI engines, produced from December 11, 2013 through July 22, 2015.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PI2104_OWNR_501 | Other | Mar 18, 2026 | 11030342 | not yet checked |
| PI2104_OWNR_401 | Other | Jul 15, 2025 | 11020817 | not yet checked |
| PI2104_OWNR_301 | Other | Nov 20, 2024 | 11010705 | not yet checked |
| PI2104_OWNR_201 | Service bulletin | Mar 19, 2024 | 10251445 | not yet checked |
| PI2104_OWNR | Service bulletin | Jul 13, 2021 | 10199207 | not yet checked |
| PI2104_TSB | Service bulletin | Jul 8, 2021 | 10199208 | not yet checked |
| PI2104_QA | Service bulletin | Jul 8, 2021 | 10199206 | not yet checked |
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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kia PI2104 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 PI2104 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 PI2104 cover?
The manufacturer filed it against 1 model year: 2016 Kia Optima. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.