Which parts fail
Components named in complaints (accelerator pedal, throttle, sudden acceleration, cruise control).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2003 Saturn Ion owners, lightly cleaned up (personal details are redacted by NHTSA).
Driving on staight on the highway hit a bump in the road my car started spinning out of control steering wheel locked up which made my driver side crash into a cement wall, my airbags did not deploy even thought the car hit the wall so hard that it cracked my radiator, my car then shut off then turned back on
I was driving down a boulevard, I was doing 40 MPH there was a police car in front and there was maybe about 2 car length distance from him. The light hit yellow and I saw him brake so I started braking as well but my car would not brake. The acceleration continued increasing, I didn't know what to do. I was slamming on the brakes but my car did not stop. My car slammed into the police car within seconds. My car was destroyed. My hood was bent in half, my front bumper scratched & peeled. The bumper stood on the car only because I kept trying to brake and the car went in an angle where it went under the cops car. Both my side fenders cracked and my front light was destroyed. The whole car frame is destroyed and I was held at fault of this accident. My insurance went up, I didn't get no money to help fix my car nor check the problem. …
I was driving my Saturn tonight and noticed that even when I would let off the brake, the car would accelerate and rpms would stay elevated. I was driving at about 35-40mph. I was coming up to an intersection and it simply didn't feel right, like it was pulling forward. The traffic light turns red and I start to apply pressure to the brakes. It felt like the brakes were resisting and it was taking a lot more pressure than usual to slow down. My car would not come to a complete stop and I was going ~5mph right up to the crosswalk. The car started violently lurching forward and still, wasn't coming to a stop. The rpms were revving and I was able to react in time to put the car in neutral, keep braking, and turn the engine off right before things would have ended very badly. I kept my car in park and turned it on, and it would shoot up immediately to 4000 RPM. …
Throttle froze during the winter months. Consumer contacted manufacturer, and was told that because warranty expired they will not make any repairs without consumer first paying for it. Also, headlight covers were covered with a film that made visibility difficult. On 3-7-04 the vehicle was involved in an accident. When the consumer took her foot off the gas but the vehicle did not slow down. The vehicle began to slide then rolled over. The driver sustain double whiplash and left shoulder muscle spasms. The vehicle was not totaled. On 6-16-04 the front passenger side wheel bearing was replaced.
Takata recalls..I have a 2003 Saturn Ion I was driving fine hit cruise control button once I was at 55 an my car made a clicking sound started jerking like the cruise control keeps coming on...I've turned car off hit brakes which should reset it but it still happens..the car feels like its down shifting an trying to accelerate on its on the rpms hump real high wen this happens..you be driving doing 50 MPH an all the sudden car jerks like its trying to stop u feel I t in gas pedal also...
Vehicle experienced sudden acceleration while in traffic, causing consumer's vehicle to crash into another vehicle. Driver sustained injuries. Taken for repair to the dealer for the second time, but the cause was undetermined even after the computer had been reset. Consumer stated the only way to stop the vehicle was when it hit the other car in front. Put foot on brake to stop the car and it surge forward.
Coming to a stop in heavy traffic alarms and lights went off, the car lost powering and wouldn't go into gear finally when the gear engaged it would only stay in first gear. Luckily we were able to pull off the busy highway and get safely to the side of the road with no accidents or injuries.
While driving at 30 MPH in cruise control mode driver pulled right to avoid hitting and object in the road, and the right wheel locked up. When this occurred vehicle impacted a tree, and damaged the a frame and other components. Vehicle was totaled.
I bought a Saturn Ion in early August of 2003. I have had 5 separate occasions where the vehicle has stalled out on me and had no control of the car what so ever! The latest time was at the interstate at 65 miles per hour with an eight wheeler truck right behind me. Had I not thought quick and put the car in neutral and restarted the car or else I would have been hit it the rear by a several ton vehicle. I could have been killed! The entire power to the car dies !! The steering column locks up and you the entire car "shuts down" and you are stuck in front of another car w/ only the prayer of restarting your Saturn Ion so that you are not killed! …
I was driving on hwy at 60 MPH for approx 2 hours. When foot was off gas, car would maintain speeds of 55-60 MPH. Exited onto exit ramp on right. Exit ramp was approx 0.4 miles long, snow covered, and uphill. Applied the brake on & off while approaching the stop sign at the end of the exit ramp, car slowed to approx 20 MPH with brake fully pressed. RPM's were approx 4,000 with brake fully pressed. Car continued accelerating with brake fully pressed. Couldn't stop, but was able to turn left and cross bridge over highway. Tried putting foot under gas pedal to see if it was stuck down, but it was not down. Continuously tried to brake, but could not slow the car to below 20 MPH even with brake fully pressed. Roads were snow covered. Went approximately 0.5 miles on prairieview rd. No cars were stopped at red light on prairieview as I approached. …
Acceleration complaints in other Ion years
Frequently asked questions
How common are acceleration problems on the 2003 Saturn Ion?
NHTSA has 38 complaints about the speed control & acceleration of the 2003 Saturn Ion, 5% of the model year's 758 complaints. The component named most often is accelerator pedal (4 mentions).
Is there a recall for 2003 Saturn Ion acceleration problems?
No. NHTSA lists no speed control & acceleration recall for the 2003 Saturn Ion, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2003 Saturn Ion acceleration problems start?
Half of the complaints with a recorded mileage happened before about 80,000 miles, and 25% before 25,000 miles.
Is it dangerous?
Owners linked 6 crashes, 0 fires and 6 injuries to speed control & acceleration problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.