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Speed sensor low input

Car keeps coming up with fault code p0502 which say speed sensor a low input does anyone no were speed sensor a is located

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Failed smog obd systems check..It says obd fault codes: P0502 Vehicle Speed Sensor CKT Low input. Is this the reason Malfunction indicator light is on? Is it the same reason it failed? What has to be

Without putting it on a scanner, replace the speed sensor first. Yes this is why the light is on and it failed. They are around the output shaft. No year, make, or model. So it hard to tell you about where it is at.

Jan 03, 2015 | Cars & Trucks

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I have a 03 Buick Century 3.1 trouble code P0502, what does this mean

That is a speed sensor "a" low input code. Sometimes the sensors are external and sometimes they are internal. I don't remember specifically for your vehicle.

I would suggest monitoring the sensor with a higher end scan tool capable of reading transmission data.

Jul 25, 2012 | Buick Century Cars & Trucks

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My speedo is not working on my1999 chevy venture. The van sat for 5 months while the head gaskets were being change. All is now fixed and running great except for the speedo not working.All other gauges...

Just to clear things up, there is no such code as "502" on a 1999 Chevrolet Venture. There is however a code P0502, which is low input for the vehicle speed sensor. This may sound like symantics, but it can make a huge difference when you are trying to diagnose fault codes. There is also a B0502 that is a possible code on that vehicle, so when you post a code, you need to post the ENTIRE code number including the prefix letter. (there are also U-codes and C-codes used on that vehicle)

Anyway, I'm done preaching...back to your question: Your vehicle speed sensor (VSS) probably got unplugged when the work was done and someone forgot to plug it back in.

The VSS is located in the transmission housing on the right side of the vehicle near where the right axle shaft goes into the transmission.

Jul 18, 2011 | Chevrolet Venture Cars & Trucks

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Can you tell me where vechile speed sencor 'A' is on my focus st the fault code is P0500

P0500 Vehicle Speed Sensor "A"
P0501 Vehicle Speed Sensor "A" Range/Performance
P0502 Vehicle Speed Sensor "A" Circuit Low Input
P0503 Vehicle Speed Sensor "A" Intermittent/Erratic/High
Vehicle Speed Sensor Removal & Installation Automatic Transmission To Remove:
  1. Remove or disconnect the following:
    • Output shaft speed (OSS) sensor electrical connector.
    • Bolt and OSS sensor
To Install:
  1. Apply a light coat of petroleum jelly to the O-ring before installation
  2. Install or connect the following:
    • OSS sensor torque bolt to 89 in-lbs (10 Nm)
    • OSS sensor electrical connector
Manual Transmission To Remove:
  1. Remove or disconnect the following:
    • Vehicle Speed Sensor (VSS) electrical connector.
    • Retaining pin.
    • VSS.
To Install:
  1. Install or connect the following:
    • VSS.
    • Retaining pin.
    • VSS connector.
The VSS is on the transmission near the output shaft. It will not be a wheel speed sensor on the hub.

Good luck on this repair, tommy.

Nov 06, 2010 | 2006 Ford Focus

1 Answer


The Code you're referring to should be a "P0502." What the Code signifies is: "Vehicle speed sensor circuit, low input."

May 18, 2010 | 2000 Saab 9-3 Viggen

1 Answer

The SERVICE BRAKE SYSTEM light comes on when driving and stays on

i had a customer with a 2004 gmc sierra 2500hd 2wd that stated that the srevice brake system light came on while driving. the transmission would shift hard and erratic plus the speedometer was erratic. the check engine light came on with two codes p0502 and p0503(vehicle speed sensor A low input and vehicle speed sensor A intermittent/erratic. i replaced both vehicle speed sensors mounted on the driver's side of the transmission. both of the speed sensors were the same. test drove the truck after and all issue were solved.

Feb 22, 2010 | 2003 GMC Yukon Denali

1 Answer

My 03 monte carlo is very sluggish. The engine

P0404 Exhaust Gas Recirculation Circuit Range/Performance
P0502 Vehicle Speed Sensor Low Input
P0440 Evaporative Emission Control System Malfunction
hope that helps /a little beyond my expertise but theres your codes your looking for ;)

Feb 04, 2010 | 2003 Chevrolet Monte Carlo

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