Ground bad somewhere diagnosed Po 502 bad

Asked by Jan 28, 2017 at 01:59 AM about the 2002 GMC Sierra 1500 SLE 4WD Standard Cab LB

Question type: General

Diagnosed. Came up PO 502.
LIGHT ON FOR ABS BRAKES
PARKING BRAKE DUMMY LIGHT
CHECK ENGINE LIGHT TRANS
NOT SHIFTING CORRECTLY. DID
FRONT GROUND by bumper
ground near TRANS what do I do
next???

1 Answer

83,885

P0502 GMC - Vehicle Speed Sensor Circuit Low Input.... Possible causes; Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed sensor circuit poor electrical connection, Faulty Powertrain Control Module (PCM)......Description, The Vehicle Speed Sensor (VSS) assembly provides vehicle speed information to the Powertrain Control Module (PCM). The VSS assembly is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage as rotor teeth on the transmission output shaft pass through the sensor's magnetic field. The AC voltage level and the number of pulses increase as the speed of the vehicle increases. The PCM converts the pulsing voltage to vehicle speed. The PCM uses the vehicle speed signal to determine shift timing and torque converter clutch (TCC) scheduling. Vehicle Speed Sensor Location Example:

2 people found this helpful.

Your Answer:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,600
  • #2
    John Saffrahn
    Reputation
    3,890
  • #3
    Glenn Clingenpeel
    Reputation
    3,720
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,788 Great Deals out of 154,390 listings starting at $1,000
Used Ford F-150
2,356 Great Deals out of 208,287 listings starting at $998
Used GMC Sierra 2500HD
145 Great Deals out of 17,680 listings starting at $2,995
Used Toyota Tundra
449 Great Deals out of 39,425 listings starting at $2,800
Used Chevrolet Silverado 2500HD
404 Great Deals out of 30,313 listings starting at $3,000
Used Dodge Ram 1500
326 Great Deals out of 9,355 listings starting at $1,995
Used Toyota Tacoma
422 Great Deals out of 48,089 listings starting at $2,994
Used Chevrolet Tahoe
547 Great Deals out of 38,191 listings starting at $1,243
Used GMC Yukon
328 Great Deals out of 21,474 listings starting at $2,450
Used Ford F-250 Super Duty
487 Great Deals out of 40,156 listings starting at $2,700
Used Chevrolet Camaro
233 Great Deals out of 27,353 listings starting at $2,077
Used Ford Mustang
260 Great Deals out of 37,870 listings starting at $1,350

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
27 Great Deals out of 35,229 listings starting at $20,490
2017 GMC Sierra 1500 For Sale
105 Great Deals out of 5,598 listings starting at $17,995
2016 GMC Sierra 1500 For Sale
52 Great Deals out of 2,714 listings starting at $16,700
2015 GMC Sierra 1500 For Sale
85 Great Deals out of 4,488 listings starting at $13,995
2014 GMC Sierra 1500 For Sale
63 Great Deals out of 2,831 listings starting at $11,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.