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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 214 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P1820: Internal Mode Switch Circuit A - Low >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3  - A low value for Signal "A" indicates a short to ground in the engine harness or the PCM.
  2. 5  - This step tests the internal transmission harness. A value of LOW for Signal "A" indicates the fault is in the harness. Otherwise the fault will be in the switch.

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