Kia Sportage Gearbox & Transmission Problems

It sounds like there’s either a problem with the throttle pedal, the throttle mechanism itself or, most likely, a glitch in the communication between the two. Instead of a throttle cable directly linking the pedal to the throttle, modern cars use what’s called fly-by-wire. In this case, that means a throttle pedal where input is converted to an electrical signal, which is then transferred by the computer to the throttle telling it to open. If there’s any wiring or software problem within this system, you could easily experience this sort of problem.

You’re quite right, too, that this represents a very dangerous situation. Many crashes have been caused by a following driver assuming the car in front was about to take off. And when, for whatever reason, it doesn’t…

If the computer won’t tell you what’s happening, an auto electrician should be able to take readings from the throttle pedal and the motor that actuates the throttle itself. From there, they should be able to discern which component is not playing the game properly.

This situation will turn out very differently depending on whether the car is still under Kia's factory warranty, or an aftermarket warranty sold by the dealership when the car was bought by your daughter. It will also depend on whether the cracked transmission case was due to a flaw or something thrown up off the road (which would count as accidental, not warranty, damage).

Kia extended its factory warranty to new, privately-owned cars on October 1, 2014. Which means the car in question was covered to that extent. With that in mind, the car should, indeed, be covered by Kia's factory warranty (until next year) so there should be no quibbling about a failure like this one that has had nothing to do with the way the car has been used or serviced. My experience is that Kia is pretty good at this stuff, figuring that its long-term reputation is more valuable than fixing an – often – rare fault. And even though your daughter was not the first owner of the car, the factory warranty is transferable to subsequent owners. Provided, that is, that the car has been serviced and maintained correctly.

If, however, the car is covered only by the aftermarket warranty, then you'll be in for a huge fight as these aftermarket warranties are rarely worth the paper they're printed on. The fine-print is full of clauses and conditions that allows the car dealer to wriggle out of their responsibility, and we simply don't recommend these warranties under any circumstances.

As for the fault itself, it's pretty rare to hear about something like a transmission case fracturing. Perhaps there was a manufacturing or casting flaw in that particular unit that has taken its time to surface and cause the failure. As for what you should do, the answer is simple: Take it back to the dealership you bought it from and make sure it's fixed properly according to the terms of Kia's own warranty. Don't be afraid to be a bit patient, and always give the dealership (or Kia) every chance to put things right before you instigating legal action or contacting the ACCC.

If Kia expresses any doubt over what caused the failure, an independent inspection (perhaps by the NRMA) will be able to determine what caused the casing to fracture and, therefore, whether it's a warranty or insurance job.

It’s not a common problem, with the Sportage or AWD vehicles in general. Even though yours is well out of warranty it’s still covered by the consumer protection laws, so it’s worth asking Kia for at least part of the cost of repairs.