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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Automatic Transmission - JATCO CVT) >> Diagnostic Information and Procedures >> DTC P0721: Output Speed Sensor Performance >> Diagnostic Aids

Diagnostic Aids

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The transmission control module detects no pulse signal from the output shaft speed sensor when there are pulses from the secondary speed sensor.