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2009
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XL7 Limited, AWD
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Diagnostic Information and Procedures
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DTC P1684-P1686: Transmission Control Module (TCM) Power Up Temperature Sensor
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Conditions for Setting the DTC
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P1684 - Fail Case 3
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P1684 - Fail Case 3
The TCM power up temperature changes by 20 °C (36 °F) or greater 14 times in a 7 second sample.