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Home >> Chevrolet >> 1996 >> Chevy Van G1500, 5.0 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls - Tests W/Codes - 5.7L) >> Trouble Code Charts >> DTC87: High Gear Ratio Error >> Notes

DTC87: High Gear Ratio Error: Notes

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Control module calculates ratio based on transmission input speed and output speed sensor readings. Control module compares known ratio to calculated ratio.

  1. An out-of-calibration transmission range pressure switch could falsely indicate actual transmission range.
  2. This test verifies proper ratio.
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