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Code 24 - No 4TH Gear: Description

PCM should apply 4th gear clutch by opening ground circuit of 4th line actuator. PCM controls hydraulic pressure to 4th gear clutch housing. If PCM detects 4th gear clutch slipping, PCM will increase line pressure. If clutch is still slipping, PCM will set code 24.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. If present, go to information flag listed. Using flow charts, check for possible causes of trouble code.
  2. See ACTUATOR QUICK CHECK  under SELF-DIAGNOSTICS. Ensure clicking sound from 4th line actuator is similar to clicking sound of other line actuators.
  3. See HYDRAULIC PRESSURE TESTS in AUTO TRANS OVERHAUL - SATURN article. If line pressure does not change or only changes a little, regulator valve is stuck.
  4. Remove valve body. Apply air pressure to 4th apply port. See HYDRAULIC PRESSURE TESTS in AUTO TRANS OVERHAUL - SATURN article.
  5. Cross-channel leaks may cause other clutches to be applied. If PCM detects other gears are stuck on, other codes will be present. This may help locate cross-channel leak.
  6. This step checks for 4th clutch operation. If clutch applies and releases, check valve body for damage. If clutch does not operate, check for failed clutch plates.
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