I was driving on the interstate and just passed a semi truck going about 65 MPH and then my car suddenly switched gears into neutral on it's own. I was able to pull over to the side of the road safely and restart the car a couple times for it to reset and go back to normal. I was on my way to the dealership when this incident occurred. There had been an issue with the park/neutral switch…
2008 Suzuki Forenza powertrain problems
moderate Owners of the 2008 Suzuki Forenza have filed 75 NHTSA complaints about the powertrain, typically surfacing around 60,000 miles at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Failure mileage
Complaints
75
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2005 Forenza | 26 |
| 2006 Forenza | 105 |
| 2007 Forenza | 113 |
| 2008 Forenza (this page) | 75 |
2crashes
1fire
When does it fail?
Of the 75 powertrain complaints filed for the 2008 Suzuki Forenza, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 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.
How fast does it fail?
Cumulative share of the 13 mileage-bearing powertrain complaints filed against the 2008 Suzuki Forenza by each odometer reading. Median failure: 64,000 mi.
10% have failed by47,000 mi
Half the fleet by64,000 mi
90% have failed by95,000 mi
Curve based on owner-reported odometer mileage at the time of complaint. Reflects when owners filed, not when symptoms first appeared. Maintenance habits and driving conditions shift the curve.
What stands out
Powertrain accounts for 49% of every owner complaint on file for this vehicle — the dominant problem area across 7 categories tracked.
Owners have filed 75 powertrain 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.
The failure pattern owners describe
Owners of the 2008 Forenza describe a transmission range sensor that fails repeatedly and dangerously. The sensor starts acting up anywhere from 15,000 to 109,000 miles—sometimes multiple times on the same vehicle. When it fails, the check engine light comes on, the gear display scrambles, and the car loses power or slips out of gear unexpectedly while driving. Owners have been stuck in third gear on the highway, unable to accelerate, and some report nearly being hit by other vehicles. The fix is sensor replacement at $191–$260 per visit, but many owners replace it 2–5 times under warranty, sometimes within months. One owner had the sensor fail four times between 49,000 and 73,000 miles.
Dealerships acknowledge this is a known issue—one technician reported replacing 4–6 sensors per month. Yet Suzuki refuses to cover it under the powertrain warranty because the sensor is technically "mounted to, not inside" the transmission. Owners also report intermittent acceleration problems, hard shifting, jerking, timing cover damage from belt friction, and complete transmission failures requiring full replacement. An airbag light stays on persistently in many cars, blamed variously on wire harness tension or seat cushion sensors. Multiple owners attempted lemon-law claims or arbitration. Service advisors have told frustrated owners the car "won't perform" or blamed driver perception rather than address documented defects.
Same Suzuki Forenza powertrain reports on nearby years: 2005 · 2006 · 2007
Failure modes owners describe
Transmission Range Sensor (TRS) Failure
The transmission range sensor fails intermittently or permanently, causing the transmission to misread its position and either refuse to shift, slip out of gear while driving, or shift unexpectedly. Owners report the check engine light illuminating (often codes P0700 and P0705), gear display scrambling or showing incorrect symbols (D with a line through it, R with an X), and loss of power during acceleration. The sensor often fails multiple times on the same vehicle within short intervals.
When: 30,000 to 109,000 miles; some failures occur as early as 15,000 miles; typically recurring 60–120 days after replacement
Symptoms owners cite: Check engine light illumination (intermittent or persistent); Transmission slipping out of gear while driving at various speeds; Inability to shift into drive or reverse, or refusal to shift out; Clunking or jerking when shifting; Gear display showing scrambled, flashing, or incorrect symbols; Loss of power during acceleration; Vehicle stuck in third gear or limp mode (max 20–35 mph); Hard shifting or rough shifting between gears
Repairs/costs cited: Replacement of transmission range sensor; cost ranges $191–$260+ per replacement; many owners had the sensor replaced multiple times (2–5 times) within warranty period; one dealer reported replacing 4–6 units per month across Forenza and Reno models; not covered under powertrain warranty because sensor is mounted to transmission, not inside it
Recalls/TSBs owners mention: Suzuki helpdesk initiated TCM re-initialization in some cases; one dealer technician acknowledged engineering design flaw; Suzuki covered repair costs for some owners after second repair but not universally; TSB issued in January 2008 regarding transmission shifting issues; some owners attempted lemon-law arbitration; no recall issued despite widespread complaints
Timing Cover Melting and Engine Noise
The timing cover melts or becomes damaged due to friction from belt slippage, causing a ringing or loud tapping noise from the engine. Engine runs loud when cold and gradually quiets as it warms up. One owner was initially told the issue would resolve after a few weeks of driving.
When: Early in ownership, within first weeks to months; one case at ~9/2008 for a September 2008 purchase
Symptoms owners cite: Ringing noise from engine; Loud tapping noise when starting or during operation; Engine running loud until warmed up; Friction damage to timing cover
Repairs/costs cited: Timing cover replaced; additional timing cover adjustments noted in follow-up visits; one invoice showed only $0 for timing cover fix (recorded as 1/23/09 release date)
Recalls/TSBs owners mention: Initial dealership response suggested new-car break-in; later replaced timing cover; issues persisted and were eventually attributed to transmission and acceleration problems rather than resolved
Transmission Control Module (TCM) and Engine Control Module (ECM) Failures
The TCM or ECM malfunctions, causing transmission shifting problems, acceleration hesitation, jerking, and check engine light illumination. Multiple replacements often occur, and issues may recur after replacement.
When: Various; one case at 55,000 miles; another at 3,500 miles after purchase
Symptoms owners cite: Check engine light on; Transmission not shifting properly; Acceleration hesitation and jerking; Engine revving higher than normal; Intermittent loss of acceleration
Codes mentioned: P2106, P2110, P0835
Repairs/costs cited: TCM and ECM replacements; one owner had ECM replaced and TCM re-initialization attempted; repair costs not consistently reported; one estimate cited $525 Suzuki assistance toward $1,300 transmission repair
Recalls/TSBs owners mention: Suzuki helpdesk ticket 175996598 suggested TCM re-initialization; ECM replacement covered by one dealer visit; Suzuki offered partial reimbursement ($525 of $1,300) in one case
Throttle Body and Engine Wire Harness Failure
The throttle body fails to respond when the accelerator is engaged, causing loss of power and check engine light illumination. Replacement of throttle body may be temporary, and the problem may recur or lead to engine wire harness and ECM replacement.
When: 71,844 miles in one documented case
Symptoms owners cite: Accelerator pedal fails to respond; Loss of power at speed; Check engine light illumination
Repairs/costs cited: Throttle body replaced; failure recurred; engine wire harness replaced; ECM replacement attempted but not completed in initial narrative
Recalls/TSBs owners mention: Manufacturer notified; vehicle repaired by replacing engine wire harness (update from 7/16/2015)
Acceleration and Power Loss
Chronic difficulty accelerating, ranging from slow acceleration to complete loss of power. Often accompanies transmission sensor or control module failures. In some cases, the car enters limp mode, restricting acceleration to 20–35 mph or causing inability to climb hills.
When: Throughout ownership, often early (within first weeks to months) and recurring
Symptoms owners cite: Slow acceleration; Drag during acceleration; Complete loss of power when accelerating; Inability to accelerate above 20–35 mph; Limp mode activation; Vehicle rolling backward on hills despite engine revving; Delayed response when pressing accelerator
Repairs/costs cited: No specific repair consistently resolved the issue; often coincided with TCM, transmission range sensor, or timing cover repairs; one dealer advised owner not to expect higher performance
Recalls/TSBs owners mention: Initial dealership response stated issue was normal for new cars; later dealers offered no solution or blamed driver perception; lemon-law arbitration filed by some owners
Side Airbag Sensor and Airbag Light Malfunction
The airbag warning light remains on persistently or illuminates incorrectly. One case involved a wire harness tension issue under the seat; another involved seat cushion sensor failure estimated at $1,500 replacement cost.
When: Present from early ownership in multiple cases; one noted present nearly entire time of ownership
Symptoms owners cite: Side airbag light remains on despite no accident; Airbag light comes on when passenger occupies seat (above 120 lbs); Airbag light illuminates intermittently
Repairs/costs cited: Wire harness relocation and securing under driver and passenger seats; seat cushion sensor replacement estimated at $1,500; frequent recurrence despite repairs
Recalls/TSBs owners mention: Dealership diagnosed wire harness connector high resistance issue and relocated harness; no comprehensive fix; one owner informed issue was daughters' long legs kicking wires
Transmission Failure (Complete)
Complete transmission failure requiring replacement, often occurring after repeated transmission range sensor failures or control module problems.
When: Multiple cases at 29,856 miles, 57,059 miles, and over 100,000 miles
Symptoms owners cite: Vehicle will not go into gear; Vehicle stalls; Transmission does not respond to shifter; Loss of forward or reverse motion
Codes mentioned: P0700
Repairs/costs cited: Full transmission replacement; one owner had 3 transmissions installed by 57,059 miles; another had 2 transmissions by ~30,000 miles; repairs cost $1,300–$1,800 out of pocket when out of warranty; sealed automatic transmission precludes user-level fluid checks
Recalls/TSBs owners mention: Suzuki covered partial costs in some cases; no recall issued; one service advisor acknowledged engineering design flaw; limited warranty coverage (12,000 miles or 12 months on clutches and drums only, not full transmission)
Throttle Position Sensor (TPS) Failure
The throttle position sensor malfunction causes erratic engine behavior, including stalling and uncontrolled revving.
When: One documented case
Symptoms owners cite: Engine revs to 5,000–6,000 rpm uncontrollably; Engine revs to 500 rpm and stalls while driving; Engine stalling while driving
Repairs/costs cited: TPS replacement; exact cost not reported
Synthesized from 75 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 13 most recent
In less than 2 months, I've had to replace several parts of my car that I don't believe is part of regular service maintenance. Thermostat, coolant hose, spark plugs (twice in a year), brake lights and headlight bulbs (replaced twice in a year), transmission control module and motor mounts because of the TCM that made my car jerk all the time whenever I accelerate. Either at a traffic light or on…
One day, when I put my car in reverse, it "clunked" into gear, the gear display was scrambled, and the check engine light came on. I shut my car off and started it again, thinking it was a fluke. The check engine light remained on and it also "clunked" into drive. When I went to accelerate, the RPM's were 5-10 higher than normal and it took a little longer to "get up and go." sometimes, my car…
The TCM switch on my 2008 Suzuki forenza was replaced in november of 2010 and was found by an authorized service center for Suzuki as being defected. I was told that it caused the transmission to switch itself into neutral, which caused the car to fail attempts to accelerate at times. I had taken the car to the Suzuki dealership where I purchased the car within 30 days of buying the car and…
Had to replace the transmission range sensor. $140 fix between parts and labor. Of course it wasn't under the 100,000 mile powertrain warranty. *tr
Tl* the contact owns a 2008 Suzuki forenza. The contact stated that the vehicle would not accelerate over 20 MPH and the check engine light would illuminate sporadically. A local mechanic diagnosed that the transmission range sensor was defective. The range sensor was replaced and the vehicle began to work normally. The dealer was contacted, but the contact was unable to have the dealer…
Transmission regulation sensor - car jumping out of gear while driving. Dangerous very dangerous. *tr
My check engine light came on and was put on machine and got a po700 and po705 which required a sensor which should not have been on a brand new car. From my understanding there have been a lot of problems with this and I don't understand why a recall has not been done on this because my warranty did not cover this do to not being inside the transmission due to Suzuki's rules.
Coming home late night around 2ish, waiting at a redlight my car does a sudden jerk, the check engine light comes on and im in drive (foot on brake pedal) but in the dash the gear starts flashing and indicating I was in neutral but I wasn't. Light turns green I go to press down on the acceleration and my car seemed like it barely wanted to drive, as if it needed a push. I didn't drive my car for…
The "trans range switch" is causing my car to jump to 2 gear randomly. The car seems to run fine after o start it. And out of no were the engine jumps and the "engine light" comes on the car acts likes its not in 1st gear. It can't get it to go into gear (drive or reverse) without it jumping. Then after the car sits for a day it acts fine for the first trip and then it starts the same problem…
Had powertrain trouble with your 2008 Suzuki Forenza?
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 2008 Suzuki Forenza?
It's a documented issue but not catastrophic. 75 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 69 complaints that reported odometer mileage, most powertrain failures cluster between 46,835 and 82,000 miles, with the median around 60,000. A quarter of owners report trouble before 46,835; a quarter make it past 82,000. 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/2008/Suzuki/Forenza.
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.