P1694 BUICK, CADILLAC, CHEVROLET, GMC: TACHOMETER CIRCUIT HIGH VOLTAGE
POST UPDATED IN February, 2023
P1694 BUICK, CADILLAC, CHEVROLET, GMC: TACHOMETER CIRCUIT HIGH VOLTAGE
A tachometer is a device used to take readings of the speed at which the engine shaft rotates, which is why this device is limited by mechanical or electrical instruments. Basically, the tachometer is the one that tells the driver how many revolutions he/she is driving. The tachometer has a needle through which it provides real-time readings, some marks or indicators that indicate certain levels, and a dial.
The location of the tachometer is the dashboard, and its indicator shows the readings resulting from the RPM of the engine shaft. The performance of the tachometer is important for regulating engine operation, although the way they measure speeds varies according to the manufacturer.
DTC P1694 OBD2 is stored when, with the key on, the PCM (Powertrain Control Module) detects voltages in the tachometer circuit that exceed the allowed range.
P1694 OBDII diagnostic code is set for one of the following reasons:
To troubleshoot the P1694 OBD2 fault code you must do the following: