P0501 Vehicle Speed Sensor “A” Range/Performance
OBD-II Trouble Code Technical Description
Vehicle Speed Sensor "A" Range/Performance
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Honda, Proton, Kia, Dodge, Hyundai, VW, Jeep, etc.
Although generic, the specific repair steps may vary depending on make/model.
What does that mean?
Basically a P0501 trouble code means that the vehicle’s speed as read by the Vehicle Speed Sensor (VSS) is outside of the expected range (too high or low for example). The VSS input is used by the vehicle’s main computer called a PCM/ECM powertrain/engine control module along with other inputs for proper operation of the vehicle systems.
How The VSS Works
Typically, the VSS is an electromagnetic sensor that uses a rotating reluctor ring to complete an input circuit to the PCM. The VSS is mounted in the transmission housing at such a position as to allow the reluctor ring to pass by it; in close proximity. The reluctor ring is attached to the output shaft of the transmission so that it spins along with it.
As the reluctor ring passes by the electromagnetic tip of the VSS, notches and grooves serve to complete and interrupt the circuit rapidly. These circuit manipulations are recognized by the PCM as transmission output speed or vehicle speed.
A typical VSS or vehicle speed sensor:
Related vehicle speed sensor trouble codes:
Potential Symptoms
This code is different from the P0500 code in the fact that it may not trigger the malfunction indicator light (MIL). Potential symptoms are basically the same as the P0500 VSS code:
Causes
A P0501 DTC trouble code may be caused by one or more of the following:
Diagnostic & Repair Steps
A good first step to do as a vehicle owner or DIYer is to search for technical service bulletins (TSBs) for your particular vehicle make/model/engine/year. If a known TSB exists (as is the case for some Toyota vehicles), following the instructions in a bulletin can help you save time and money in diagnosing and repairing your issue.
Next, visually inspect all wiring and connectors that lead to the speed sensor. Look closely for any chafing, bare wires, broken wires, melted, or otherwise damaged areas. Repair as required. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly.
If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure will depend on your make and model of vehicle.
If everything looks OK, replace the sensor.
Further Reading
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"Delete Error Code Permanently, Disable DTC Error Code Function for p0501 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p0501 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p0501.
