Symptoms
Symptoms of a DTC P2158 may include:
- Loss of anti-lock braking
- The “anti-lock” or “braking” warning lights on the dashboard may be illuminated
- The speedometer or odometer may not function correctly (or at all)
- Your vehicle’s RPM limiter may be reduced
- Shifting of an automatic transmission may become irregular
- Other symptoms may also be present
Causes
A P2158 code may indicate that one or more of the following events have occurred:
- The vehicle speed sensor (VSS) “B” is not reading (functioning) correctly
- A broken/frayed wire leading to the vehicle speed sensor
- The vehicle’s PCM is not properly configured for the actual tire size of the vehicle
Possible Solutions
A good first step for vehicle owners or DIYers is to search for technical service bulletins (TSBs) for your specific make/model/engine/year of vehicle. If there is a known TSB (as is the case for some Toyota vehicles), following the instructions in a bulletin can help save time and money in diagnosing and repairing your issue.
Next, visually inspect all wiring and connectors leading to the speed sensor. Carefully look for rubbing, exposed wires, broken wires, melted areas, or other damage. Repair as needed. The sensor’s location depends on your vehicle. The sensor may be located on the rear axle, transmission, or possibly the wheel hub assembly (brake).
If the wiring and connectors are in good condition, check the voltage at the speed sensor. Again, the exact procedure will depend on your vehicle’s make and model.
If everything appears correct, replace the sensor.