Having problems with your 2001 Hyundai XG300 ?

The car down shifts on it's own. With out moving your foot.

Posted / edited by AnonymousUser on : 21-01-2019

Answers :

Most probably the Throttle Position Sensor has gone bad or is going bad. Scan for any trouble codes (DTC's) using an OBD!! scan tool. Your XG uses a drive by wire/sensor system called the ETS - Electronic Throttle System. There is a control module which operates the step-motor connected to the throttle plate. The gas pedal you press is cable connected to a sensor called the APS (Accelerator Position Sensor - which could also be the cause of your 'downshift by itself' issue. Both these sensors are simple potentiometers and can wear out and develop bad spots in the wiper plates/contacts.
Repair Help & Product Troubleshooting for 2001 Hyundai XG300

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