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2012 Great Wall X200 is accelerating on its own

My 2012 Great Wall X200 intermittently accelerates, without me putting pressure on the throttle pedal, when changing gears. Put it in neutral and it continues to increase revs. The spanner indicator comes on, then all returns to normal.

Like a lot of relatively modern vehicles, the X200 doesn't use a throttle cable, but is instead what's known as throttle-by-wire. That means that the accelerator pedal tells the car's computer what position the driver has placed it in, then the computer tells the throttle to respond accordingly.

It all works on electronics and position sensors and if anything goes wrong with that arrangement, you can get erroneous messages being sent to the throttle with the symptoms you've mentioned. An electronic scan of the vehicle should reveal what's wrong as the computer will have recorded fault codes with any of this electronic gear.

Beyond that, it could also be something rather more mechanical such as a sticky stepper motor (that physically opens the throttle) or even a vacuum leak. It could even be a fault with the electronic protocols that tell the engine to increase its idle speed when, for instance, the air-conditioning it turned on. Again, though, a scan at a workshop should reveal all.

Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

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