While the vehicle was operating the engine had a noticeable amount of power reduction and there were multiple knocking sounds occurring simultaneously. The vehicle was being operated in the right-most furthest lane of a busy freeway in the middle of traffic and at freeway speeds of approximately 65 mph. The issue seemed to originate from the engine causing engine malfunction without engine light…
2010 Kia Forte powertrain problems
moderate 20 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
20
Recalls
0
Avg fix
$2,500
1injury
When does it fail?
Of the 20 powertrain complaints filed for the 2010 Kia Forte, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 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
Among the 13 model years of Kia Forte in our records for powertrain problems, this one ranks #2 by owner-complaint volume.
No new NHTSA powertrain complaint has been filed on this vehicle in over 4 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2010 Kia Forte's powertrain suffers from multiple serious issues: automatic transmissions that lock up or slip out of gear unpredictably, creating collision hazards; engines that develop rod knock or bearing failure; and shifter mechanisms that fail or stick. Many failures occur without warning lights and are sometimes denied warranty coverage or misdiagnosed by dealers.
Owners of the 2010 Kia Forte report extensive powertrain problems across transmissions, engines, and shift mechanisms. The automatic transmission exhibits delay in shifting (up to 30 seconds) and locks up at specific speeds, particularly 20 or 45–50 MPH, after the engine warms up. Some owners report the transmission slips from Drive into Neutral involuntarily, forcing them to hold the shifter constantly or risk losing power mid-intersection. Shifter mechanisms stick or become sluggish; several owners cannot engage Park or remove the ignition key. One vehicle moved forward instead of backward when shifted to Reverse.
Engine problems include rod bearing and connecting rod failures causing loud knocking, sometimes leading to complete engine shutdown while driving. Owners report power loss and knocking sounds without illuminated warning lights, making failures unpredictable. Timing chain failure also occurs, with at least one dealer initially denying powertrain warranty coverage. Oil pump failure is reported in at least one case.
Several failures occur shortly after recall service at dealerships. A clutch failure at 167,000 miles followed recall work; a transmission failure at 157,000 miles occurred after recall service SC165A. One owner reports the vehicle creeps downhill when parked on a mild slope. Engine stalls at stops, and transmission disengages momentarily while driving are also reported. Costs for engine work exceed $2,000; transmission service and repairs vary. Some dealers deny coverage citing normal wear; others do not diagnose root causes.
Same Kia Forte powertrain reports on nearby years: 2011 · 2012
Failure modes owners describe
Transmission shift delay/lockup (5-speed automatic)
Transmission freezes at one speed (typically 20 or 45-50 MPH) and takes up to 30 seconds to shift. Occurs after warmup, often after climbing hills or on level ground. Hazardous because vehicle becomes stuck at low speed (10-20 MPH) when pulling into traffic.
When: 23,000 miles; occurs after 10+ minutes of driving warmup
Symptoms owners cite: Transmission seizes/freezes at one speed; Delayed shift (up to 30 seconds); Vehicle stuck at low speed (10-20 MPH) unable to accelerate into traffic; Occurs in dry/warm weather (50-60°F)
Repairs/costs cited: Dealer recommended transmission fluid flush ($150); did not resolve issue. Vehicle had loaner arranged at dealership.
Recalls/TSBs owners mention: Recall procedures unknown; warranty coverage applied at time of complaint (23,000 miles, full warranty)
Clutch failure (manual transmission)
Clutch failed without warning while driving 65 MPH, preventing downshift and forcing emergency brake stop. Occurred post-recall service at dealer.
When: 167,000 miles
Symptoms owners cite: Sudden clutch failure; Inability to downshift; Vehicle forced to emergency stop; Failure occurred after recall service at dealer
Repairs/costs cited: Upon inspection, dealer noted cabin filter and two front tires needed replacement, plus wheel alignment. Owner declined repair. Vehicle remained at dealer unrepaired.
Recalls/TSBs owners mention: Recalls performed (18V363000 airbags; 23V652000 service brakes)
Engine connecting rod bearing failure
Connecting rod bearing in cylinder #1 failed, causing loud rattling noise from inside engine. Vehicle remains at dealership unrepaired. Owner disputes warranty denial and manufacturer recall responsibility.
When: Unknown mileage; 2024 complaint date
Symptoms owners cite: Loud rattling noise from inside engine; Engine malfunction
Repairs/costs cited: Dealership initially charged $235 for service check, later retracted bill. Vehicle unrepaired at dealership as of complaint date.
Recalls/TSBs owners mention: Dealership denied warranty coverage (2010 model, out of factory warranty). Owner notes recall exists for 2010–2013 Kia Forte covering this issue; manufacturer claims recall does not apply or vehicle condition not covered.
Transmission jerking/sudden deceleration post-recall
After recall repair (Manufacturer Recall SC165A), transmission jerked unexpectedly and vehicle decelerated suddenly at 60 MPH while in gear with clutch engaged. Vehicle became inoperative and required towing.
When: 157,000 miles
Symptoms owners cite: Transmission jerking; Unexpected deceleration; Vehicle became inoperative
Repairs/costs cited: Not diagnosed or repaired. Dealer attributed failure to normal wear and tear.
Recalls/TSBs owners mention: Manufacturer Recall SC165A performed prior to failure; no further notification of failure to manufacturer
Stuck/unresponsive throttle (5-speed manual)
At 425 and 800 miles, gas pedal felt stuck or depressed even though driver's foot was completely off the pedal. Engine revved high without driver input. Dealer diagnostics found nothing.
When: 425–800 miles (new vehicle)
Symptoms owners cite: Engine revs high without driver input; Feels like gas pedal is stuck or depressed; Occurs with foot completely off pedal
Repairs/costs cited: Dealer computer diagnostics found no problem. Issue ceased after 800 miles.
Recalls/TSBs owners mention: None documented
Gear shift lock/inability to shift from Drive or Neutral
Unable to shift out of Drive or Neutral into Park; unable to remove keys; vehicle trapped. Rear brake lights failed to illuminate. ESC control light illuminated. After 15+ minutes of restart attempts, vehicle finally entered Park; ESC light remained on.
When: Mileage unknown
Symptoms owners cite: Shifter locked in Drive/Neutral; Unable to engage Park; Unable to remove keys; Rear brake lights inoperative; ESC/traction control disabled
Repairs/costs cited: None documented
Recalls/TSBs owners mention: Owner learned dealer confirmed identical problem exists on other models that triggered recalls; owner's Forte not included in recall
Shifter slippage (automatic transmission)
Automatic shifter became sluggish and required more force. Over weeks, vehicle slips from Drive into Neutral involuntarily. Driver must hold shifter back in Drive position constantly to maintain gear. Slippage has occurred while driving through intersections, creating collision hazard.
When: Mileage unknown
Symptoms owners cite: Shifter sluggish, requires more force; Vehicle slips from Drive into Neutral; Requires continuous force to maintain Drive; Slippage during intersection crossing
Repairs/costs cited: None documented
Recalls/TSBs owners mention: None documented
Engine power loss and knocking (no warning light)
Engine experienced noticeable power reduction and multiple simultaneous knocking sounds at 65 MPH freeway speeds. No engine warning light illuminated before, during, or after incident. Engine malfunction unidentifiable despite professional inspection.
When: Mileage unknown
Symptoms owners cite: Power reduction; Multiple knocking sounds; Engine malfunction without warning light; Vehicle now inoperative
Repairs/costs cited: Professional inspection performed but not thoroughly diagnosed.
Recalls/TSBs owners mention: None documented
Timing chain failure
Vehicle failed to start. Timing chain failed and required replacement. Dealership initially denied warranty coverage, claiming it falls outside powertrain warranty. Owner disputes this, arguing timing chain is essential powertrain component.
When: Mileage unknown
Symptoms owners cite: Vehicle will not start; Timing chain failure
Repairs/costs cited: Repair took 10 days; cost $1,200 out-of-pocket. Owner had to pay because dealership denied warranty coverage.
Recalls/TSBs owners mention: Dealership denied powertrain warranty coverage for timing chain
Park engagement failure and reverse-to-forward movement
Vehicle would not stop when placed in Park; shifter gets stuck. When placed in Reverse, vehicle moved forward instead of backward at approximately 5 MPH without pressing accelerator. Required both brake pedal and emergency brake to stop.
When: Mileage unknown
Symptoms owners cite: Park does not hold vehicle; Shifter sticks; Reverse produces forward motion; Vehicle moves forward at ~5 MPH in Reverse without throttle input
Repairs/costs cited: None documented; vehicle taken to dealer
Recalls/TSBs owners mention: None documented
Engine rod knock/bearing wear
Engine produces knock noise consistent with rod knock or spud bearing failure. At 88,000 miles on non-original owner. Repair estimate $2,000.
When: 88,000 miles
Symptoms owners cite: Knock noise from engine; Suspected rod knock or bearing failure
Repairs/costs cited: Independent shop quoted $2,000 for repair; non-original owner may not have warranty coverage.
Recalls/TSBs owners mention: Unknown; non-original owner status complicates warranty eligibility
Transmission sudden gear shift and tire skid
At 45 MPH, transmission suddenly shifted gears and tires skid. Speedometer worked erratically. Smell of burning rubber detected. Occurs very early in vehicle life (800 miles).
When: 800 miles
Symptoms owners cite: Sudden unexpected gear shift; Tire skid; Erratic speedometer; Burning rubber smell
Repairs/costs cited: Not inspected or repaired
Recalls/TSBs owners mention: None documented
Engine oil pump failure
Oil pump failure caused engine to shut down while driving in traffic. Owner claims defect caused sudden stop, creating roadway safety hazard.
When: Mileage unknown
Symptoms owners cite: Oil light came on after service; Engine died; Engine failure while driving in traffic
Repairs/costs cited: Occurred immediately after oil change at shop; shop noted engine recall exists for this motor
Recalls/TSBs owners mention: Engine recall noted for this motor; owner seeks engine replacement coverage
Rod bearing failure (engine shutdown)
Loud knocking from engine at low speed (<30 MPH), followed by total power loss. Inspection confirmed broken rod bearing requiring engine replacement.
When: Mileage unknown
Symptoms owners cite: Loud knocking from engine; Complete loss of power; Rod bearing broken
Repairs/costs cited: Engine replacement required
Recalls/TSBs owners mention: None documented
Vehicle creep on parked slope
Vehicle with automatic transmission slipped 4–5 feet down driveway slope at least three times while parked. Driveway slope noted as mild.
When: Mileage unknown
Symptoms owners cite: Vehicle rolls downhill when parked; Slippage of 4–5 feet observed multiple times
Repairs/costs cited: None documented
Recalls/TSBs owners mention: None documented
Engine stalling and transmission disengagement while driving
Engine quits at stop lights/signs for no apparent reason. While driving, transmission kicks out of gear momentarily then re-engages. Requires restart in Park or Neutral to continue.
When: Mileage unknown
Symptoms owners cite: Engine stalls at stops; Transmission kicks out of gear while driving; Requires restart to continue
Repairs/costs cited: None documented
Recalls/TSBs owners mention: None documented
Shift cable failure
Shift cable broke, preventing vehicle from shifting out of Drive into Reverse or Park.
When: Mileage unknown
Symptoms owners cite: Cannot shift out of Drive; Cannot access Reverse or Park; Shift cable broken
Repairs/costs cited: Shift cable replacement required
Recalls/TSBs owners mention: None documented
ESP warning and transmission low-speed shift malfunction
ESP warning light illuminates intermittently. Auto transmission shift stuck in low speed.
When: Mileage unknown
Symptoms owners cite: ESP warning light intermittent; Transmission shifting stuck in low speed
Repairs/costs cited: None documented
Recalls/TSBs owners mention: None documented
Synthesized from 20 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Vehicle failed to start. Had vehicle towed to garage who stated that it was a problem with timing chain and should be covered under warranty. Had vehicle re-towed to dealership who stated that it was a bad timing chain and that it was not covered under warranty. This is not a belt, but a chain. The timing chain should be covered under the powertrain warranty. It's a necessary part for the…
Had powertrain 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 powertrain problem on the 2010 Kia Forte?
It's a documented issue but not catastrophic. 20 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 11 complaints that reported odometer mileage, most powertrain failures cluster between 38,200 and 157,000 miles, with the median around 94,000. A quarter of owners report trouble before 38,200; a quarter make it past 157,000. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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.