TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: SUBSEQUENT REPAIR ACTION: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI2102Y/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 (PI2102) titled “Knock Sensor Detection System - ECU Logic Improvement” for 2010-2011MY Forte and Forte Koup (TD)vehicles equipped with Theta 2.4L MPI engine, produced from February 24, 2009 through May 31, 2011. Specifically, this bulletin provides instructions on which procedures to follow if, after
full bulletin at NHTSA ↗2010 Kia Forte engine problems
severe 60 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
60
Recalls
0
Avg fix
$3,100
4fires
When does it fail?
Of the 60 engine complaints filed for the 2010 Kia Forte, here's the actual mileage breakdown — failures cluster heaviest at 125,000-150,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 60 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Engine accounts for 26% of all owner complaints filed against this vehicle, across 12 categories tracked.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
PRODUCT IMPROVEMENT CAMPAIGN: OWNER RENOTIFICATION (PI2102) - This document is the owner renotification advising that Kia is conducting a Product Improvement Campaign to perform a software update on 2010-2011 MY Kia Forte & Forte Koup vehicles equipped with 2.4-liter engines to protect the engine from excessive connecting rod bearing damage. The update will be done free of charge and will only involve the addition of newly developed computer software for the Engine Control Unit ("ECU").
full bulletin at NHTSA ↗SUBSEQUENT REPAIR ACTION: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI2102Y/Z) - This bulletin provides information related to the Technical Service Bulletin previously published in (PI2102) titled "Knock Sensor Detection System - ECU Logic Improvement" for 2010-2011MY Forte and Forte Koup (TD) vehicles equipped with Theta 2.4L MPI engine, produced from February 24, 2009 through May 31, 2011. 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).
full bulletin at NHTSA ↗TSB_ENG070_R1_CLOSED: TECHNICAL SERVICE BULLETIN CLOSED
full bulletin at NHTSA ↗TSB_BOD049_CLOSED: TECHNICAL SERVICE BULLETIN CLOSED
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 60 complaints center on two categories: rod bearing failure and stalling with no diagnostic codes.
Rod bearing failures dominate the reports. Owners describe sudden loud knocking or ticking from the engine, often after routine oil changes. Mechanics find metal shavings in the oil and sludgy conditions despite recent maintenance. These failures progress from noise to complete engine seizure, with costs running $3,000–$6,000 for replacement. Mileage varies widely—from 47,000 to 179,000 miles—but the pattern is consistent: owners report low mileage, good maintenance history, and engine failure that Kia refuses to cover under warranty.
Two vehicles caught fire on the highway (speeds of 50–55 mph), with one owner reporting loss of power steering and brakes simultaneously with the ignition. No warning lights preceded either fire.
Stalling without codes affects multiple owners across low and high mileages. Engines shut off at stops or during acceleration with no check engine light, and restart normally. Dealers cannot reproduce the condition and refuse diagnosis.
Chronic ticking on startup is common, dismissed by dealers as normal, yet owners report it worsens over time. One owner heard the noise from purchase day onward; another reported it became persistent after years of warm-up fade.
A 2010 purchased brand-new exhibited misfire code P0304 within days, recurred after clearing, and the vehicle required eight recalls simultaneously.
Owners frequently mention lawsuits and Canadian recalls addressing identical engine problems that Kia states do not apply to their VINs.
Same Kia Forte engine reports on nearby years: 2011 · 2012 · 2013
Failure modes owners describe
Rod bearing failure with engine knock
Rod bearings fail prematurely, causing loud knocking or ticking noise from the engine. Owners report metal shavings in the oil, sludgy oil, and bearing material debris. Failure can occur with relatively low mileage and proper maintenance. The noise typically intensifies before complete engine seizure.
When: 50,000 to 179,000 miles; some reports after recent oil changes; often progresses over weeks
Symptoms owners cite: loud knocking or ticking noise from engine; metal shavings in engine oil; sludgy oil despite recent changes; oil light coming on; loss of power while driving; engine seizure or locking
Codes mentioned: P0304 (misfire cylinder 4), rod knock diagnosis by mechanic inspection
Repairs/costs cited: Owners report engine replacement costs $3,000 to $6,000. Some quote junkyard motors as less expensive option. Repairs typically required due to warranty expiration.
Recalls/TSBs owners mention: Kia declined coverage under expired warranty; owners cited pending class-action suit in Quebec and multiple lawsuits mentioned; Kia informed owners VINs not included in recalls despite similar failures in other model years
Engine fire during operation
Engine catches fire while driving at highway speeds, often preceded by knocking or loss of power. Owner reports no warning before fire; power steering and brakes lost simultaneously with ignition. Complete vehicle loss reported.
When: At highway speeds (50–55 mph); one incident at 137,000 miles
Symptoms owners cite: engine knocking before fire; loss of all electrical power; loss of power steering and brakes; smoke and flames from engine compartment; burning smell from engine
Repairs/costs cited: Vehicle totally destroyed in both cases; one towed and scrapped; replacement engine not applicable
Recalls/TSBs owners mention: Manufacturer warranty expired so no coverage offered; extended warranty (CNA National) also refused to cover as mechanical issue; owners noted Kia's open recall in Canada for ticking/fires but not addressed in U.S.
Stalling without warning lights
Engine stalls suddenly during operation (at stops, low speeds, or highway speeds) with no check engine light or diagnostic codes. Vehicle restarts normally. Stalling occurs sporadically and is not reproducible by dealer diagnostics, complicating identification.
When: As early as 5,000 miles; also at 10,000, 43,000, and 111,000 miles
Symptoms owners cite: sudden engine stall while driving; no check engine light; no warning before stall; dashboard lights remain on; easy restart after stall
Repairs/costs cited: No repairs made in most cases; dealer unable to diagnose or reproduce failure; one owner suspected fuel economy package ECU glitch
Recalls/TSBs owners mention: Dealership refused diagnostic when problem could not be reproduced; manufacturer not contacted in most cases
Engine knock (ticking) without imminent failure
Persistent ticking or knocking noise from engine on startup or during idle, often described as normal by dealers and mechanics. Noise increases over time and may be accompanied by oil burning. Owner reports well-maintained cars with low mileage experiencing this chronic condition.
When: Early in vehicle life (some reported from day of purchase); persists over months to years; accelerates around 80,000–120,000 miles
Symptoms owners cite: loud ticking or knocking on startup; noise diminishes after warm-up initially, then becomes persistent; noise worsens over time and with acceleration; steering wheel vibration from engine noise; burning oil smell reported in one case
Repairs/costs cited: Owners report multiple mechanics saying this is normal and refusing diagnosis; one mechanic suggested crank shaft sensor replacement without resolving issue; dealers attribute to lifter wear
Recalls/TSBs owners mention: Kia informed owners knocking is normal for these engines; owners noted similar issues resolved via recalls on 2011+ models in Canada but not applied to 2010
Piston slap and cylinder wall damage
Early cylinder wall and piston damage detected at low mileage; metal shavings present in oil. One dealer diagnosis cited piston slap specifically at 51,000 miles.
When: 51,000 miles
Symptoms owners cite: abnormal ticking sound from engine; metal shavings in engine oil
Repairs/costs cited: Repair was not pursued by owner
Recalls/TSBs owners mention: Manufacturer notified; no action noted
Reduced power and RPM limiter (limp mode)
Engine enters a reduced-power state where RPM does not rise above 3,000, preventing acceleration. No check engine light illuminates. Condition occurs sporadically during drive and can recur multiple times.
When: During various drives; affects highway operation
Symptoms owners cite: RPM cannot exceed 3,000; inability to accelerate above reduced speed; no check engine light; engine stalling while on highway incline; jerking and misfire-like behavior
Repairs/costs cited: One mechanic suggested crank shaft sensor replacement; no successful repair reported; one incident occurred on highway with heavy traffic creating safety hazard
Recalls/TSBs owners mention: None documented
Throttle body malfunction (intermittent no-start)
Throttle body fails to function properly, causing intermittent no-start condition after vehicle sits. Problem persists even after replacement part installed.
When: Original part failed March 2016; replacement part same problem February 2017
Symptoms owners cite: vehicle will only crank but not start after sitting; starts normally once warmed up; problem recurs after next idle period
Repairs/costs cited: Original throttle body replaced March 24, 2016; replacement part exhibited same defect by February 2017; repair shop noted same problem in other customer vehicles
Recalls/TSBs owners mention: No manufacturer response documented
Misfire and computer glitches (early 2010 model)
Check engine light illuminates with misfire code (P0304) on brand-new vehicle within days of purchase. Dealership clears code but problem recurs immediately. Vehicle also exhibits unintended acceleration.
When: Within 10 days of purchase (10/27/2009 and 11/11/2009 on 10/17/2009 purchase)
Symptoms owners cite: check engine light on; cylinder 4 misfire code (P0304); unintended acceleration; multiple other recalls needed immediately
Codes mentioned: P0304
Repairs/costs cited: Dealership cleared code as system glitch and updated computer; problem persisted; vehicle placed in dealership rental while troubleshooting
Recalls/TSBs owners mention: Kia authorized rental car while dealer and corporate attempted diagnosis; multiple recalls identified on vehicle (gas cap, cruise control, transmission, computer)
Hard jerking during gear shifts
Vehicle jerks hard when changing gears, felt multiple times shortly after purchase as demo unit. Behavior resembles transmission failure symptoms.
When: Within 10 days of purchase of demo unit (6/25/11–7/05/11); four separate incidents
Symptoms owners cite: hard jerking when changing gears; feels like transmission malfunction
Repairs/costs cited: No repairs documented
Recalls/TSBs owners mention: No response documented; owner noted similar reports on Kia forums
Idle surge (delayed acceleration response)
Vehicle surges forward suddenly after 10-second delay when driver presses accelerator from stop. RPM gauge shows idle state until sudden jump to demanded throttle position.
When: Intermittent; happens infrequently but recurs
Symptoms owners cite: 10-second delay in response to accelerator input; sudden surge forward without gradual acceleration; RPM gauge stuck at idle until surge
Repairs/costs cited: No repairs documented
Recalls/TSBs owners mention: No response documented
Excessive oil consumption
Engine consumes abnormal amount of oil between fill intervals. Independent mechanic found no oil in engine at one service check.
When: By 130,000 miles
Symptoms owners cite: no oil in engine at diagnostic check; abnormal rattling sound from engine; excessive oil level drop between fills
Repairs/costs cited: No repair attempted; owner advised to check oil frequently when refueling
Recalls/TSBs owners mention: Manufacturer not contacted; local dealer not contacted
Synthesized from 60 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
Took care of the car and my motor has recently gone out. Lost power going up hill and had a bad ticking noise I pulled off an exit and it sounded like something broke in the motor. Very disappointed.
The ac condenser froze up therefore I could not start vehicle . It was snowing and freezing and I was stranded for 2 hours. The ac should not be going bad on a 2010 vehicle . I read many reports on this particular problem in the Kia fortes all years. Well someone could get hurt when there vehicle stops running in the middle of a busy highway!!! This is a problem!!! Mechanic told me I could of…
This engine has a widespread problem of ticking coming from the top part of the engine, and issues with oil including burning oil. I personally have experienced both despite many efforts to try to remedy the problem. Many other drivers of the same car have had these same issues which have LED to scoring in the cylinders and complete engine failure. I myself am also very close to engine failure.…
Engine has been acting up. Knocking. Tapping. Less power. MPG in the 20s. Get gas 127000 miles on it. Has been well maintained. Overall defective engine. I hope they recall this engine soon before lots of people get hurt when their engine craps out on them doing 70 on the freeway.
Engine is knocking very loudly. Concerned it is going to fail while driving it and cause an accident. I have noticed many other people have this issue with this 2.0 engine Kia has.
Had engine trouble with your 2010 Kia Forte?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2010 Kia Forte?
It's a meaningful issue. 60 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 38 complaints that reported odometer mileage, most engine failures cluster between 54,798 and 130,000 miles, with the median around 100,000. A quarter of owners report trouble before 54,798; a quarter make it past 130,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2010/Kia/Forte.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.