My 06 forenza would not shift into drive and the check engine light would come on then it would get better and the check engine light would turn off. Then I started getting the periodic clunk and scrambled display, usually while in a parking lot or when just starting a trip and driving slow. I finally took it to advance auto and they told me it was the transmission sensor. They sent me to the…
2006 Suzuki Forenza powertrain problems
moderate Owners of the 2006 Suzuki Forenza have filed 105 NHTSA complaints about the powertrain, typically surfacing around 62,000 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
105
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2005 Forenza | 26 |
| 2006 Forenza (this page) | 105 |
| 2007 Forenza | 113 |
| 2008 Forenza | 75 |
1crash
When does it fail?
Of the 105 powertrain complaints filed for the 2006 Suzuki Forenza, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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
Powertrain accounts for 38% of every owner complaint on file for this vehicle — the dominant problem area across 12 categories tracked.
Owners have filed 105 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
The 2006 Forenza's main complaint is the transmission range sensor failing repeatedly, often after the 36,000-mile warranty ends. Owners describe the dashboard showing scrambled symbols or a line through the "D," the engine revving while the car won't move, sudden shifts into neutral while driving at highway speeds, hard clunking noises when shifting, and loss of power to accelerate. The check engine light turns on with codes P0700 or P0705. One owner had it replaced, and it failed again 10,000 miles later. Repair costs $200–$300 in parts alone, and Suzuki doesn't cover it under powertrain warranty because the sensor sits outside the transmission housing. Service technicians acknowledge it's a known, frequent problem but can't help without payment.
Beyond the transmission sensor, owners report the valve cover leaking oil into spark plugs early on, the engine stalling or unintended acceleration after a few months, power steering pump failure, interior door handles breaking, and headlight wiring failures—all costly fixes outside warranty. Multiple owners note the Forenza is actually a rebadged Daewoo and received no manufacturer support once problems emerged. The complaints cluster around safety: cars dropping into neutral at 60 mph, refusing to accelerate in intersections, and forcing owners to downshift to limp home. No recall has been issued despite TSBs circulating and widespread consumer complaints across forums.
Same Suzuki Forenza powertrain reports on nearby years: 2005 · 2007 · 2008
Failure modes owners describe
Transmission Range Sensor (TRS) Failure
The transmission range sensor malfunction causes the vehicle to display incorrect gear indicators on the dashboard, shift unexpectedly into neutral, reverse, or park while driving, or fail to accelerate properly. This is the dominant failure mode cited across nearly all complaints.
When: Typically between 40,000–98,000 miles; many failures occur after the 36,000-mile warranty expires and outside the powertrain warranty scope
Symptoms owners cite: Check engine light illumination (often with codes P0700 or P0705); Dashboard gear indicator displays scrambled symbol or line through 'D' for drive; Vehicle suddenly shifts into neutral while driving or refuses to shift out of park; Loss of acceleration or vehicle limited to speeds under 20 mph; Hard jerking or clunking noise when shifting gears; Engine revs but car does not move forward; delayed acceleration; Intermittent transmission range sensor code, sometimes clearing and reappearing
Codes mentioned: P0700, P0705, P0734
Repairs/costs cited: Replacement cost typically $200–$300 for the sensor alone; labor adds $50–$150 more. Owners report the sensor is located outside the transmission housing and thus not covered under the powertrain warranty. Some complaints mention the connector or engine harness also failing ($800–$900 for harness replacement). At least one owner reports the part failed again within 10,000 miles of prior replacement.
Recalls/TSBs owners mention: Suzuki acknowledges it is a common, well-known problem but does not cover the part under powertrain warranty because the sensor sits outside the transmission proper. No official recall has been issued despite owners noting TSBs (Technical Service Bulletins) have been issued. Multiple complaints mention service technicians stating they see the failure frequently but are unable to help outside of warranty.
Valve Cover Leak / Oil Leakage into Spark Plug
The valve cover is improperly sealed, allowing oil to leak into the spark plug cavity. This triggers the check engine light and requires replacement of both the valve cover gasket and the affected spark plug.
When: Within the first few weeks of ownership (used car purchase)
Symptoms owners cite: Check engine light comes on early in ownership; Oil leakage visible or detected during diagnostics
Repairs/costs cited: Valve cover gasket replacement and spark plug replacement. One owner paid warranty coverage at a Las Vegas dealer.
Recalls/TSBs owners mention: Covered under warranty at one dealership in the complaint.
Engine Stalling and Unintended Acceleration
Vehicle stalls during driving or exhibits unintended acceleration and revving of the engine. Owners report the vehicle stopping in the middle of traffic or on highways, creating serious safety hazards.
When: Early in ownership and sporadically thereafter
Symptoms owners cite: Vehicle stalls while driving; Engine revs unexpectedly; Tachometer accelerates while vehicle does not move; Loss of power to accelerate
Repairs/costs cited: One owner paid $275 for battery diagnostic and replacement; throttle was also replaced ($489 to repair wires or more for full replacement); main engine wiring harness replacement quoted at $1,600.
Recalls/TSBs owners mention: Engine wiring harness not covered under powertrain warranty.
Power Steering Pump Failure
The power steering pump shaft walks out of the pump housing or otherwise fails, requiring pump replacement. One owner incurred $1,000 in repair costs.
When: Post-warranty period; complaint occurred 6 weeks after transmission switch failure
Symptoms owners cite: Loss of power steering
Repairs/costs cited: Full power steering pump replacement cost $1,000. Part was on back order, leaving the owner without a loaner vehicle.
Door Handle Failure
Interior door handles break or snap off, becoming inoperable. Multiple owners report both driver and passenger side failures.
When: Within the warranty period or early in ownership
Symptoms owners cite: Door handle breaks or snaps during normal use; Handle lands in driver's hand when attempting to exit vehicle
Repairs/costs cited: Dealer replacement required. One owner replaced handles themselves to save cost.
Headlight and Wiring Harness Failure
Headlight and high beam wiring fails, requiring wiring harness replacement. Service manager noted it as a known problem but not recalled.
When: In the warranty period or shortly after
Symptoms owners cite: Headlight and high beam failure
Repairs/costs cited: Wiring harness replacement cost $118 after warranty expiration.
Recalls/TSBs owners mention: Service manager stated it was a known problem but no recall was issued.
Synthesized from 105 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 5 most recent
2006 Suzuki forenza, brake sensor went out and car would not go out of park and into drive. I fixed that and then on december 19, 2009 I was drving down the highway and the car went out of drive and into neutral. I almost wrecked because I couldn't get the car back into drive to keep up with the flow of traffic. In a panic I put the car in 3rd gear and I was able to make it home. The mechanic…
The check engine light keeps coming on. While driving approximately 30 MPH the vehicle stopped accelerating. The vehicle was stopped and shifted into park. Upon shifting it back into drive the vehicle operated as normal. Also, as I move the gear into park, drive or reverse, the car jerks through each gear and drives real slow before picking up the speed that can be very dangerous especially at…
Tl* the contact owns a 2006 Suzuki forenza. The contact stated that the MIL warning lamp illuminated and the vehicle could not be shifted into fourth gear. The vehicle was taken to the dealer where the technician diagnosed that the transmission range sensor was defective and needed to be replaced. The manufacturer was made aware of the failure. The vehicle was not repaired. The failure mileage…
2006 Suzuki forenza. The check engine light keeps coming on. Also a "line" through the "d". Engines revs on acceleration, but acts as if in idle, then lurches forward. Has happened several times intermittently. Online research indicates this problem is widespread. *tr
Had powertrain trouble with your 2006 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 2006 Suzuki Forenza?
It's a documented issue but not catastrophic. 105 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 91 complaints that reported odometer mileage, most powertrain failures cluster between 42,000 and 91,234 miles, with the median around 62,000. A quarter of owners report trouble before 42,000; a quarter make it past 91,234. 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/2006/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.