P0502 OBD Error Code: Problem & Solutions

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If the engine control module would detect a different reading of speed between the vehicle speed sensor and the wheel speed sensors, then the error code P0502 would start triggering up. The fault code P0502 can be defined as Vehicle Speed Sensor A Low Input.

Want to learn something more about this fault code?

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Vehicle Speed Sensor “A” Low Input?

• The ABS tone rings might be broken
• Some quirks in the instrument cluster
• Malfunctioning powertrain control module
• The vehicle speed sensor might have some flaws
• Defaults in the wiring or connectors in the vehicle speed sensor circuit
• Multiple faulty wheel speed sensors/ hub bearings
• Incorrect size wheels or tires

1. Speedometer - A faulty Speedometer can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Electronic Control Unit - If everything is alright with PCM, then there is surely some defect in Electronic Control Unit. Get it replaced before the situation gets worse.
3. Engine Control Module - P0502 code can display due to some issues in the Engine Control Module. So, it is very important to replace the Engine Control Module with us at equitable prices.
4. Powertrain Control Module - Do you remember when was the last time you got your car Powertrain Control Module checked up? A faulty Powertrain Control Module can cause a lot of issues like displaying P0502 code.
5. ABS System Parts - There can be some issues with the ABS System Parts due to which you may see P0502 code appearing over and over again. Visit us to buy best quality ABS System Parts online.
6. Engine Wiring Harness - Are you facing some faults in your Engine Wiring Harness? Don’t worry and get them replaced or else P0502 code can turn up.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0502 here:

Common Symptoms

• Erratic speedometer/odometer operation
• Appearance of the service engine soon lamp, traction control lamp, or anti-lock brake lamp
• Unexpected activation/deactivation of the traction control system
• There can be other transmission and ABS codes may be stored
• Inoperable ABS system
• The transmission shift patterns might be irregular

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Replacing a CV axle due to a faulty tone ring
• If there are some faults in the engine control module, then it should be replaced
• Restore the instrument cluster
• You must replace the vehicle speed sensor
• Repair or replace the wiring or connectors in the vehicle speed sensor circuit
• Make sure to replace one or more-wheel speed sensors
• Defective hub bearing should be replaced properly
• Fit the correct size wheels and tires to the vehicle

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Here are some steps which you should follow in order to diagnose this fault code:

The P0502 trouble code starts appearing because of a faulty vehicle speed sensor so the mechanic would likely start by locating it

If the sensors wiring and connector seem to be in good condition, the mechanic would then test the vehicle speed sensor using the manufacturer’s recommended procedure

All the wheels and tires should be checked by the mechanic carefully to ensure they are the correct size

A check of the suspension on all four wheels would be performed to check the tone rings and wheel speed sensors

If no other issues are found, the ECM would be tested and parts would be replaced

Common Mistakes When Diagnosing The P0502 Code

• The most common mistake which can be made while diagnosing the P0502 trouble code would be to replace the vehicle’s instrument cluster due to the inaccurate speedometer