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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transmission - 5ET50 (MKE)) >> Diagnostic Information and Procedures >> DTC P077B-P077D: Output Speed Sensor Circuit >> Circuit/System Verification

Circuit/System Verification

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  1. Verify that DTC P0721, P0970, P0971, P0973, P2720, P2721, P2729 or P2730 are not set.
  2. Operate the vehicle at 16 - 32 km/h (10 - 20 mph) while observing the Transmission Data OSS Direction parameter on the scan tool. The OSS Direction parameter should match vehicle direction.
    • If the OSS parameter corresponds with the vehicle direction and the DTC is set, replace the T6 power inverter module.
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