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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Automatic Transmission - 4T65-E - DTC PO218 Through DTC P2534) >> DTC P1820, P1822, P1823, P1825, P1826, or P1915 >> Conditions for Setting the DTC >> P1820

Conditions for Setting the DTC: P1820

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The IMS signal A is continuously low this ignition cycle, and the IMS indicates transitional position D4-D3 for 8 seconds or greater.

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