When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
It could be something with the rear wheel speed control sensors. Check the code to find out if you are dealing with the left side or the right side of the car.
C1784 Right rear speed sensor circuit malfunction -
Right rear speed sensor
Right rear speed sensor circuit
Skid control ECU (Brake actuator assembly)
Suspension control ECU
C1785 Left rear speed sensor circuit malfunction -
Left rear speed sensor
Left rear speed sensor circuit
Skid control ECU (Brake actuator assembly)
Suspension control ECU
if it IS related to speed controls....do you have mismatched tire sizes? Like new tires in the rear and older tires in the front? if so rotate the tires and see if it goes away