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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 220 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P1819: Internal Mode Switch - No Start\Wrong Range >> 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  - HI values for all signals in both Park and Drive 4 indicates the ground circuit is OPEN.
  2. 5  - With the 20-pin connector disconnected, all signals should indicate #1.
  3. 7  - If one circuit affects the other, this indicates a short between the two circuits.
  4. 13  - This step tests the internal transmission harness. If no fault is found in the harness, the fault will be in the switch.

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