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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 (MYC 6L80E, MYD 6L90E)

PNP Switch Malfunction (MYC 6L80E, MYD 6L90E)

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. Ignition OFF. Disconnect the 16-way harness connector from the transmission.
  3. Ignition ON. Measure voltage on the park/neutral signal circuit terminal 3 with a DMM. Verify that there is greater than 10 V on the park/neutral signal circuit.
    • If less than the specified range, test the circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, reconnect the 16-way harness connector to the transmission.
  5. Remove the automatic transmission fluid pan. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement .
  6. Disconnect the manual shift shaft position switch connector at the control solenoid valve assembly. Refer to Manual Shift Shaft Position Switch Replacement .
  7. Ignition ON, verify that the scan tool PNP Switch parameter displays In Gear.
    • If not the specified value, replace the ECM.
  8. Connect a 3 A fused jumper wire between the park/neutral signal terminal F at the control solenoid valve assembly and ground. The scan tool PNP Switch parameter should display Park/Neutral when the terminal is connected to ground.
    • If not the specified value, replace the ECM.
  9. If all circuits test normal, test or replace the manual shift shaft position switch.
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