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

3,526

Rating Summary
3,215
155
41
23
92
3,215
155
41
23
92

Damian

8 years of experience
141 reviews
Damian
8 years of experience
On time. Professional and courteous. Would recommend.
2004 SAAB 9-3 - CHECK ENGINE LIGHT IS ON - ORLANDO, FLORIDA

Jonathan

19 years of experience
304 reviews
Jonathan
19 years of experience
Jon is always on time and very helpful!
2007 NISSAN VERSA - CHECK ENGINE LIGHT IS ON - DENVER, COLORADO

Richard

18 years of experience
451 reviews
Richard
18 years of experience
Great service again.
1997 DODGE RAM 1500 - CHECK ENGINE LIGHT IS ON - FAIRBURN, GEORGIA

Joseph

15 years of experience
115 reviews
Joseph
15 years of experience
He was very professional! He explained to me everything that was going on with my car in laymans term and gave me good reccomendations for things to look out for. And he topped of my transmission fluid and brake fluid out of the kindness of his heart! Much appreciated.
2009 HYUNDAI SONATA - CHECK ENGINE LIGHT IS ON - TOWSON, MARYLAND

More related articles

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)...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...

Related questions

Q: i need to know the key sequence to get the check engine codes

Hello. The old style of retrieving codes was indeed done by turning the key on and off again. However vehiles manufactured after 1996 are equipped with OBD-II diagnostic systems. This means the driver or technician can acess and even control...

Q: Car stopped randomly and didn't drive afterwards

Hello, thanks for writing in. The computer will go into a failure mode and may not allow the electronic throttle to open if it detects a major computer or sensor fault. There can be many possible failures that will cause...

Q: Car starts and runs perfectly for 3-4 minutes then stalls and won't restart for several hours.

Hi there. From the description you have provided, your vehicle's P0335 code is not being corrected by replacing components. Assuming, the replacement components are correct by application and of OEM (original equipment manufacturer) quality. It could be, the crankshaft reluctor...

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