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I have a 2004 Chevy Avalanche. When I turn the key, Nothing! No sound, Nothing. If I put it in gear then back to park, it will start then. Any suggestions? Thank you.

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  • Chongris Nov 14, 2010

    Thank you for the info, but I am having a hard time trying to locate the PNP Switch Mounting bolts. Can you advise please.........

  • Chongris Nov 28, 2010

    I received your response, thank you. But I still can not locate the PNP switch. Can you please help by giving me further details on the location of this switch or a picture / diagram? Thank you.

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  • Chevrolet Master
  • 6,826 Answers

Sounds like the Transmission PNP (Park Neutral Position) safety switch for park and neutral is adjusted wrong or is bad.

Adjustment To Adjust:

  1. Place the transmission range selector in the neutral position.
  2. With an assistant in the driver's seat, raise and suitably support the vehicle.
  3. Loosen the park/neutral position (PNP) switch mounting bolts.
  4. While the vehicle is in neutral, rotate the switch while the assistant attempts to start the engine.
  5. Following a successful start, turn the engine off.
  6. Tighten the PNP mounting bolts to 18 lb ft (25 Nm).
  7. Lower the vehicle.
  8. Check the PNP switch for proper operation.
  9. Replace the PNP switch if proper operation can not be achieved.

Removal & Installation To Remove:
  1. Apply the park brake.
  2. Shift the transmission into neutral.
  3. Raise and suitably support the vehicle.
  4. Remove the front propeller shaft, if equipped with 4-wheel drive.
  5. Disconnect the electrical connector from the park/neutral position (PNP) switch.
  6. Remove the nut from the manual shaft.
  7. Remove the control lever from the manual shaft.
  8. Remove the PNP switch mounting bolts.
  9. Remove the switch from the manual shaft.
Transmission Position Sensor Removal I have a 2004 Chevy - gm_trk_sub15_trans_pos_sensor_rem.gif

NOTE: If the PNP switch did not slide off the manual shaft, file the outer edge of the manual shaft in order to remove any burrs.
To Install:
  1. Install the PNP switch on the manual shaft by aligning the flats in the switch with the flat surfaces on the manual shaft.
  2. Slide the switch on the manual shaft until the switch contacts the mounting bosses on the transmission. NOTE: New switches will come with a positive assurance bracket. The positive assurance bracket aligns the new switch in its proper position for installation and the use of the park neutral switch aligner will not be necessary.
  3. Install the PNP switch bolts finger tight. Transmission Position Sensor adjustment

  4. Install J 41364-A onto the PNP switch. Make sure the two slots on the switch where the manual shaft is inserted are lined up with the lower two tabs on the tool.
  5. Rotate the tool until the upper locator pin on the tool is lined up with the slot on the top of the switch. Tighten the bolts to 18 lb ft (25 Nm).
  6. or positive assurance bracket from the switch.
  7. Install the control lever on the manual shaft. Tighten the nut to 18 lb ft (25 Nm).
  8. Connect the electrical connector to the PNP switch.
  9. Install the front propeller shaft of equipped.
  10. Lower the vehicle.
  11. Check the switch for proper operation. The engine must start in the park or neutral positions only.
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Posted on Nov 09, 2010

  • Duane Wong
    Duane Wong Nov 29, 2010

    Click on the X's for diagrams.

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