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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 401 (Engine Controls - Self Diagnostics - 8.1L) >> Diagnostic Tests >> DTC P2120: App Sensor 1 Signal Or App Sensor 5-Volt Reference Out Of Range >> Test Description

Test Description

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The numbers below refer to the step numbers in the diagnostic procedure.

  1. 12

    This test isolates whether the short is to another TAC system circuit in the harness or within the TAC module.

  2. 26

    When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
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