P1693 BUICK, CADILLAC, CHEVROLET, GMC: TACHOMETER CIRCUIT CONDITIONS
POST UPDATED IN February, 2023
P1693 BUICK, CADILLAC, CHEVROLET, GMC: TACHOMETER CIRCUIT CONDITIONS
The tachometer is used to measure how fast the engine shaft rotates, which is usually limited to various electrical or mechanical instruments. The tachometer indicates the vehicle driver the Revolutions Per Minute (RPM) that the object is making. This device consists of a needle that indicates current readings, a dial, and various markings that signal dangerous and safe levels.
The tachometer is installed on the vehicle’s dashboard, and its indicator basically indicates the resulting readings of the revolutions per minute of the engine’s driveshaft. This device is essential to carry out the regulation of the engine’s work. However, the way they take the measurements always varies.
When the P1693 OBDII fault code is set on GMC, Chevrolet, and other vehicles, it is because the tachometer circuit has experienced malfunctioning conditions. Specifically, the PCM (Powertrain Control Module) detected an open circuit, short to ground or short to voltage in the tachometer circuit with the key on.
The reasons for storing the P1693 OBD2 diagnostic code P1693 are:
Steps to solve the DTC P1693 OBDII code: