Buick 24244544 Sensor Assembly, Automatic Transmission Input Speed

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On 4WD models, the VSS should be unscrewed using a deep socket.

There are a variety of electric-shift transfer cases on the models covered and several different combinations of speed sensors are available. The Vehicle Speed Sensor (VSS) sends information to the PCM for the driveability program and is located at the rear output shaft. The procedure for checking and replacement of the output shaft speed sensor is essentially the same as the procedure for the Vehicle Speed Sensor (VSS). A scan tool must be used to access speed sensor data and trouble codes.

The VSS signal drives the speedometer on the instrument panel.

The VSS is located on the right side of the extension housing.

Disconnect the electrical connector and remove the sensor mounting bolt. Place a drain pan underneath the sensor before removing it.

Yes, the procedure for checking and replacing the output shaft speed sensor is similar to that of the VSS.

To remove the vehicle speed sensor (VSS), first raise the vehicle and place it securely on jackstands. Then, disconnect the electrical connector from the VSS. On 2WD models, remove the VSS hold-down bolt and remove the VSS from the transmission. On 4WD models, unscrew the VSS with a deep socket. Remove the old O-ring from the VSS and discard it, and be sure to use a new O-ring when installing the VSS (even if you're planning to reuse the old VSS sensor). To install the VSS, simply reverse the removal steps and be sure to tighten the VSS hold-down bolt (2WD models) or the VSS (4WD models) securely.

The Vehicle Speed Sensor (VSS) is a permanent magnet generator mounted on the transmission. It is triggered by a toothed rotor on the transmission output shaft. As the output shaft rotates, the sensor produces an AC voltage, the frequency of which is proportional to vehicle speed. The PCM uses the sensor input signal for several different engine, transmission and radio control functions. The VSS signal also drives the speedometer on the instrument panel. A defective VSS can cause various driveabilily and transmission problems. To replace it, raise the vehicle and support it securely on jackstands. Disconnect the electrical connector from the VSS, which is located on the right side of the extension housing on automatic transmission models and on the left side of the extension housing on manual transmissions. Remove the mounting bolt and withdraw the VSS from the transmission case. Replace the sensor O-ring and lubricate it with clean transmission fluid. Installation is the reverse of removal.

A scan tool is required to access speed sensor data and trouble codes.

This manual covers models with various electric-shift transfer cases and different combinations of speed sensors.

The first step is to raise the vehicle and place it securely on jackstands.

To install the VSS, the removal steps should be reversed and the VSS hold-down bolt (2WD models) or the VSS (4WD models) should be tightened securely.

The VSS is located at the rear output shaft.

The VSS is triggered by a toothed rotor on the transmission output shaft.

When installing the VSS, a new O-ring should be used, even if the old VSS sensor is being reused.

The first step is to raise the vehicle and place it securely on jackstands.