I have a two wheel drive 2007 Kia sorento. When I drive between 35 and 50 MPH the car begins to jerk, sometimes violently. I have taken it twice to the dealer to have it looked at. The dealer has contacted Kia engineers who say that the jerking is within acceptable parameters and nothing will be done to fix the problem. They have described the problem as being called a fish bite. The invoice…
2007 Kia Sorento powertrain problems
severe 17 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
17
Recalls
0
Avg fix
$2,500
2crashes
1injury
When does it fail?
Of the 17 powertrain complaints filed for the 2007 Kia Sorento, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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
No new NHTSA powertrain complaint has been filed on this vehicle in over 18 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners of 2007 Kia Sorentos report pervasive transmission and driveline issues, most concentrated in the 35–50 mph range. The most common complaint is jerking, shuddering, or bucking during acceleration or at steady cruising speeds—sometimes violent enough to feel unsafe. Several owners describe this as a "torque converter lock-up" problem at lower speeds, and dealers have attributed it to software or electronic throttle calibration. Some owners report hard or rough shifts, difficulty engaging gears, and unexpected automatic downshifts when using Sport-A-Matic mode. One owner describes excessive play in the driveline when shifting from forward to reverse, causing clunking on hills and hills-out maneuvers.
Four-wheel-drive models present a distinct hazard: jerking or lurching when stopping and turning on ice, which led to two reported accidents (garage impact, highway spin). One owner experienced a 360-degree spin immediately after engaging 4WD on a cold morning at 40 mph. Dealers and Kia dismissed these as normal operation or design characteristics.
A small number of narratives report other powertrain failures: a harmonic balancer breaking on a 2007 Optima at low mileage, causing engine belt failure and loss of power steering; transmission delay and incorrect gear selection; torque converter lockup requiring software updates with no permanent fix; and a fractured gear shift lever. One owner reported contaminated brake fluid preventing gear engagement, though that failure may involve hydraulic linkage rather than the transmission itself.
Kia's consistent response to most complaints has been that the behavior is normal or a software issue under investigation, with no recalls or remedies offered.
Same Kia Sorento powertrain reports on nearby years: 2005 · 2006 · 2008
Failure modes owners describe
Shuddering/jerking during acceleration and cruising (35–50 mph)
Vehicle jerks, shudders, or bucks violently when accelerating or maintaining steady speed in the 35–50 mph range. Occurs randomly and intermittently. Described by some owners as a torque converter lock-up phenomenon; dealers and Kia have attributed it to electronic throttle body self-adjustment or software calibration. Owners report it continues after dealer visits and that Kia deems it normal operation.
When: First occurrence typically within weeks to months of purchase; persists throughout ownership. Most common at 35–50 mph.
Symptoms owners cite: Violent jerking or shuddering during acceleration; Bucking at steady cruising speeds, especially 35–50 mph; Hesitation and loss of power on hills; Jerking when resuming from cruise control; Engine noise and strain on inclines
Repairs/costs cited: Dealership service visits typically involve test drives confirming the problem but offering no repair; no parts replacement cited. One owner reports nine-day dealer visit with no resolution and subsequent hard shifts into all gears.
Recalls/TSBs owners mention: Kia stated the behavior is normal and within acceptable parameters; also characterized as normal TCC lock-up. District managers reported working on the issue without finding a cure. One service manager told owner the problem was 'characteristic of the car.' No TSBs, recalls, or software fixes provided.
Transmission hard shifts, rough shifting, and delayed engagement
Transmission bangs, slips, or slides into gears with hard jolts. Shifts do not engage smoothly. Occurs in multiple gears, including 5th. Dealers have replaced driveshafts without resolving the issue in one case. One owner reports transmission was problematic from purchase date.
When: From early ownership (as early as purchase); one owner cites October 10, 2007 purchase with ongoing issues as of 2008. Another at 1,600 miles.
Symptoms owners cite: Hard or rough shifts into gears; Slipping and sliding shifts; Incomplete gear engagement; Clunking or ker-klunk sensation when shifts occur or when engine and transmission speed synchronize
Repairs/costs cited: One owner had driveshaft replaced without fixing the jerking. Another owner reports nine-day dealership service with no permanent solution; hard shifts worsened after repair visit.
Recalls/TSBs owners mention: Kia acknowledged transmission problems in some cases but offered no fix. Dealers unable to diagnose or repair. One dealer stated no repair currently available for torque converter lockup.
Sport-A-Matic mode automatic downshift from 5th to 4th gear
When driver shifts transmission lever from Drive to Sport-A-Matic position at highway speed (65 mph), transmission automatically downshifts to 4th gear instead of staying in the gear the vehicle was in. Other Kia models and competing transmissions with this feature operate without this behavior.
When: Occurs consistently when Sport-A-Matic lever position is selected at cruising speeds.
Symptoms owners cite: Automatic downshift to 4th gear when entering Sport-A-Matic mode; Unexpected shift down from 5th gear
Repairs/costs cited: No repairs cited.
Recalls/TSBs owners mention: Kia stated this is normal for that model year and owner must accept it; implied no fix available.
Four-wheel-drive jerking and lurching when turning on ice
When vehicle is placed in 4WD and driver attempts to turn while stopped or moving slowly on ice or snow, the vehicle jerks, lurches, or makes sudden movements, causing loss of control. Owner engaged 4WD at 31°F turning into garage on ice and vehicle lurched into wall. On another occasion, 4WD engagement at 40 mph on cold morning caused immediate 360° highway spin. Both incidents resulted in vehicle damage; owner reported safety concerns to Kia.
When: Occurred during winter driving in cold conditions. First incident October 2009, second February 2010.
Symptoms owners cite: Jerking or lurching movement when turning in 4WD on ice; Violent spinning on highway when 4WD engaged; Loss of vehicle control
Repairs/costs cited: No repairs made. Vehicle struck garage wall and sustained dent; all four tires flattened in highway spin incident.
Recalls/TSBs owners mention: Dealer initially claimed vehicle does not have 'on the fly' 4WD despite owner's manual stating otherwise. Kia Safety Headquarters told owner the car operates as designed and expressed no concern. Owner noted that Kia redesigned Sorento in 2008 to use AWD instead, eliminating this design defect.
Driveline play and clunking (forward-to-reverse shifts)
Excessive play in transmission or driveshaft noted when shifting from forward to reverse or reverse to forward. Manifests as a clunking or shuddering sensation. Owner reports it becomes problematic on icy roads. Also occurs when vehicle is climbing hill and transmission upshifts, or descending and engine/transmission speeds synchronize.
When: Evident at low mileage (problem reported as ongoing from October 2007 purchase). Affects multiple shift scenarios.
Symptoms owners cite: Clunking or ker-klunk sound during direction shifts; Shuddering when transmission upshifts on hills; Noticeable play in drivetrain; Becomes hazardous on icy roads
Repairs/costs cited: Attempts to repair: one owner's up-shifting and down-shifting simultaneously was fixed, but excessive play in driveline persists. Nine-day dealer service visit did not resolve issue.
Recalls/TSBs owners mention: No manufacturer response documented for this specific issue.
Torque converter lockup and surging
Transmission surges and torque converter locks up, causing hesitation and jerking, particularly at lower speeds around 35 mph. Dealers performed software updates without achieving lasting fix. One dealer stated no repair currently available for torque converter malfunction.
When: Evident at low mileage (100–720 miles at first complaint).
Symptoms owners cite: Transmission surge; Difficulty switching gears; Torque converter lockup; Jerking at 35 mph
Repairs/costs cited: Software update performed at first service visit without permanent resolution.
Recalls/TSBs owners mention: Dealer stated no repair currently available for torque converter issue. Implied ongoing investigation.
Harmonic balancer failure and engine belt separation (2007 Optima)
On a 2007 Kia Optima with 4,000 miles, harmonic balancer broke without warning during normal highway driving, causing main engine serpentine belt to slip off all pulleys. Loss of power steering and electrical functions resulted. Service manager confirmed balancer 'broke and it wasn't supposed to do that.' Part appears to have failed prematurely under normal conditions.
When: At 4,000 miles; incident occurred at 2 months of ownership.
Symptoms owners cite: Sudden loud clunk while driving; Loss of power steering; Loss of electrical power and warning lights; Engine belt separated from all pulleys; Harmonic balancer visibly broken and resting against engine block
Repairs/costs cited: Harmonic balancer replacement (major part and labor). Service manager stated this is a major repair.
Recalls/TSBs owners mention: Service manager stated the part 'broke and it wasn't supposed to do that.' Customer service remained vague about whether it was a design defect. No indication of recall, TSB, or warranty coverage decision provided in narrative.
Gearshift lever fracture
Gear shift lever fractured when driver moved it from Park to Drive position at approximately 110,000 miles. Vehicle was not repaired or diagnosed further.
When: At approximately 110,000 miles.
Symptoms owners cite: Gear shift lever fractured during normal use
Repairs/costs cited: No repair completed.
Recalls/TSBs owners mention: Manufacturer was notified of the failure; no further response documented.
Sudden loss of power/acceleration ('limp home' mode activation)
Vehicle suddenly lost power and acceleration at 30 mph without warning. ECS OFF and Check Engine lights illuminated simultaneously. Vehicle entered what owner describes as 'limp home' mode. Occurred twice within three days. Owner notes symptoms began after completing recall service (brake switch and ECM upgrade). Extremely dangerous if occurs at highway speeds.
When: Occurred at 47,760 miles, approximately 7 years into ownership. Two incidents within 3 days.
Symptoms owners cite: Instant loss of power and acceleration; ECS OFF light and Check Engine light illuminate simultaneously; Vehicle enters limp-home mode; No warning before failure
Codes mentioned: Check Engine, ECS OFF
Repairs/costs cited: No repair described; issue reported to NHTSA for safety investigation.
Recalls/TSBs owners mention: No manufacturer response documented. However, owner reports symptoms began immediately after recalls for brake switch and ECM upgrade were completed.
Synthesized from 17 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had powertrain trouble with your 2007 Kia Sorento?
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 2007 Kia Sorento?
It's a meaningful issue. 17 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 9 complaints that reported odometer mileage, most powertrain failures cluster between 20,000 and 71,885 miles, with the median around 47,760. A quarter of owners report trouble before 20,000; a quarter make it past 71,885. 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/2007/Kia/Sorento.
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.