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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1301 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> Starter Solenoid Does Not Click >> Circuit/System Testing >> PNP Switch Malfunction (M30 4L60E, M70 4L70E)

PNP Switch Malfunction (M30 4L60E, M70 4L70E)

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the range selector lever cable for proper adjustment. Refer to Range Selector Lever Cable Adjustment .
  2. Inspect the park/neutral position switch for proper adjustment. Refer to Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement .
  3. Ignition OFF. Disconnect the harness connector from the park/neutral switch.
  4. Ignition ON. Probe the ground circuit terminal 7 with a test lamp that is connected to B+. Verify that the test lamp illuminates.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  5. Verify that the scan tool PNP Switch parameter is In Gear.
    • If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the ECM.
  6. Install a 3 A fused jumper wire between the ground circuit terminal 7 and the signal circuit terminal 3. Verify that the scan tool PNP Switch parameter is Park/Neutral.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. If all circuits test normal, test or replace the park/neutral position switch.
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