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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1626 (Automatic Transmission - 4L80-E - Service & Replacement) >> Diagnostic Information and Procedures >> DTC P0502: Low Vehicle Speed And There Is A High Engine Speed In A Drive Gear Range >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4. This step tests the AT OSS circuit.
  2. 7. This step tests the integrity of the AT OSS sensor.
Fig 1: DTC P0502 (Steps 1 - 3)
G01952144Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0502 (Steps 4 - 12)
G01952145Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P0502 (Steps 13 - 16)
G01952146Courtesy of GENERAL MOTORS CORP.
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