DTC B16A7 Dodge
Vehicle Speed Sensor (VSS) A
Vehicle Speed Sensor (VSS) A
Description
Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the VSS, the transfer case speed sensor (TCSS) or the anti-lock brake system (ABS) control module. If the engine RPM is above the torque converter stall speed (automatic transmission) and the engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient vehicle speed data input, a concern is indicated and this DTC sets. On most vehicle applications the malfunction indicator lamp (MIL) illuminates when this DTC sets.
Cause and Solution
Open in the VSS+ VSS- harness circuitOpen in the TCSS signal or the TCSS signal return harness circuitShort to ground in the VSS harness circuitShort to ground in the TCSS harness circuitShort to voltage in the VSS harness circuitShort to voltage in the TCSS harness circuitDamaged drive mechanism for VSS or TCSSDamaged VSS or TCSSDamaged wheel speed sensorsDamaged wheel speed sensor harness circuits
Diagnosis:
Monitor the VSS PID while driving the vehicle. This DTC sets when the PCM detects a sudden loss of vehicle speed signal over a period of time. If vehicle speed data is lost, check the source of the vehicle speed input: VSS, TCSS or ABS. On some manual shift-on-the-fly (MSOF) applications, VSS and TCSS PID can be monitored. However if no TCSS PID is available and VSS PID is zero, TCSS circuitry frequency must be checked for loss of sensor.
Video Guide
Diagnostic Info
- DTC Code: B16A7
- Brand: Dodge