P0502 OBD-II Trouble Code: Vehicle Speed Sensor Low Input

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0502 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0502 code

P0502 is a diagnostic trouble code (DTC) for "Vehicle Speed Sensor Low Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0502 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

Vehicle Speed Sensor Low Input

What the P0502 code means

The P0502 trouble code means that the Engine Control Module (ECM) has detected a different reading of speed between the vehicle speed sensor and the wheel speed sensors.

What are the causes of the P0502 code?

  • A faulty vehicle speed sensor
  • Damaged wiring or connectors in the vehicle speed sensor circuit
  • Multiple faulty wheel speed sensors/ hub bearings
  • Broken ABS tone rings
  • A faulty powertrain control module
  • Incorrect size wheels or tires
  • A faulty instrument cluster

What are the symptoms of the P0502 code?

Other than a Check Engine Light and an inaccurate speedometer, there should be next to no symptoms associated with this trouble code.

How does a mechanic diagnose the P0502 code?

The most common cause of the P0502 trouble code is 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.

The mechanic would also check all the wheels and tires 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.

Finally, if no other issues are found, the ECM would be tested and parts would be replaced at the customer’s request.

Common mistakes when diagnosing the P0502 code

A common mistake that could be made when this trouble code is stored would be to replace the vehicle’s instrument cluster due to the inaccurate speedometer. The instrument cluster receives a signal from the vehicle speed sensor so it is important to check there first.

How serious is the P0502 code?

This trouble code is not very serious at all due to the fact that it does not cause any drivability issues. The only thing to worry about with this trouble code is getting a speeding ticket due to the inaccurate speedometer.

What repairs can fix the P0502 code?

Repairs that can fix the P0502 trouble code may include:

Additional comments regarding the P0502 code?

Many people like the looks of very large wheels on their vehicle. However, they do not realize the potential damages this can cause to the vehicle. The ride quality suffers, the wheels are more susceptible to damage from pot-holes, the brakes do not work as well, the steering is not as predictable, and codes such as the P0502 may be stored.

Need help with a P0502 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P0502

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0502 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,788

Rating Summary
3,460
163
43
24
98
3,460
163
43
24
98

Robert

17 years of experience
436 reviews
Robert
17 years of experience
Didn’t properly diagnose the check engine. He thought it was one thing and it really was the catalytic converter.
2003 HONDA CIVIC - CHECK ENGINE LIGHT IS ON - DENVER, COLORADO

Joe

40 years of experience
576 reviews
Joe
40 years of experience
Joe was early for his appointment and was in his usual positive mindset. Joe went right to work to determine the problem and came up with solutions to repair my car. Joe is very professional and an asset to your company (My Mechanic) and to me. Thanks.
2004 JAGUAR S-TYPE - CHECK ENGINE LIGHT IS ON - PORT RICHEY, FLORIDA

John

17 years of experience
310 reviews
John
17 years of experience
Love John he will be the mechanic I use on my Cadillac for services. Thanks john
2004 CADILLAC CTS - CHECK ENGINE LIGHT IS ON - OCOEE, FLORIDA

Chris

12 years of experience
312 reviews
Chris
12 years of experience
Chris was able to come earlier than expected and notified me beforehand. He was able to quickly identify the problem and suggest a solution. He was very professional and polite, and patient with me even though I wasn't feeling my best! Excellent service, would use again should any more problems arise!
2013 CHEVROLET SONIC - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

More related articles

Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: Q: Car shut off while driving

Without additional information, it is hard to say what could have caused this. Your car has a variety of sensors that can cause it to shut down depending on whether or not everything is functioning correctly. I would suggest having...

Q: I put a cold air intake on my car I have replace the O2 sensor that is failing area code p0151 I'm not sure what to do mass is new

Hello. If the P0151 code persists after replacing the oxygen sensor, then it may be possible that the issue is with the wiring. If there is any damage or wear to the oxygen sensor connector or wiring there may be...

Q: The airbag light is on, could it be caused by previous work done on the car?

The SRS (Airbag) light comes on when the controller has sensed a malfunction somewhere in the system. The malfunction may be an open circuit or an incorrect voltage at any of the sensors. When the controller sees the error, it...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com