DTC C2174/74: Vehicle Speed Signal Malfunction; DTC C2191/91: Vehicle Speed Signal Error (Test Mode DTC) [03/2014 - ]: Description

Speed signals are input into the tire pressure warning ECU and receiver from the combination meter assembly. At the same time, the acceleration sensor in the tire pressure warning valve and transmitter detects driving conditions, and sends signals to the tire pressure warning ECU and receiver. If the speed signal from the combination meter assembly stops and the acceleration sensor signal in the tire pressure warning valve and transmitter indicates that the vehicle is being driven, DTC C2174/74 is stored.

DTC C2191/91 is stored only during the test mode.