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Diagnostic Aids

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Check for spread connectors at pass-thru connector. Code 68 will set when going to default (2nd gear). If code is intermittent, see INTERMITTENTS in appropriate TESTS W/O CODES article in this section. See below.

Fig 1: Code 68 Schematic (4L80-E Diesel) Overdrive Ratio Error
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Fig 2: Code 68 Schematic (4L80-E Gasoline) Overdrive Ratio Error
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Fig 3: Code 68 Flow Chart Overdrive Ratio Error
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