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Test Description

WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. 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. 5:  By disconnecting the transmission range switch, the ground path of all TR switch circuits would be removed and the PCM would recognize all circuits as open. The scan tool will display HI for all range signals.
  2. 6:  This step tests TR switch wiring for an open or the lack of the signal voltage from the PCM.
  3. 7:  This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal A should change to LOW.
  4. 8:  This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal B should change to LOW.
  5. 9:  This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal C should change to LOW.
DTC P0706

Step Action Value Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Failure Records from the PCM.
  3. Record the Failure Records.
  4. Clear the DTCs.
  5. Select TR Sw. on the scan tool.
  6. With the scan tool, observe the TR Sw. display while selecting each transmission range: P, R, N, D3, D2 and D1.
Does each selected transmission range match the scan tool TR Sw. display?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Inspect the PNP switch assembly for the following conditions:
  2. Inspect the shift cable for the following conditions:
Did you find and correct a condition?		 - Go to Step 16  Go to Step 4 
4 With the scan tool, observe the TR Sw. A/B/C/P display.
Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states?		 - Go to Step 13  Go to Step 5 
5
  1. Turn OFF the ignition.
  2. Disconnect the PNP switch connector.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states?		 - Go to Step 6  Go to Step 10 
6
  1. Using the DMM and the J 35616  GM terminal test kit, measure the voltage from the TR signal A circuit of the PNP switch connector to ground.
  2. Measure the voltage from the TR signal C circuit of the PNP switch connector to ground.
  3. Measure the voltage from the TR signal P circuit of the PNP switch connector to ground.
  4. Measure the voltage from the TR signal B circuit of the PNP switch connector to ground.
Does the voltage measure within the specified value at all four terminals?		 10-12 V Go to Step 7  Go to Step 11 
7 Connect a fused jumper wire from the TR signal A circuit of the PNP switch connector to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When the signal A circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 8 
8 Connect a fused jumper wire from the TR signal B circuit of the PNP switch connector to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When the signal B circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 9 
9 Connect a fused jumper wire from the TR signal C circuit of the PNP switch connector to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When the signal C circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 14 
10 Test the TR signal circuits that did not indicate HI for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
11 Test the TR signal circuits of the PNP switch that did not indicate proper voltage for an open. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
12 Test the affected TR signal circuits of the PNP switch for a shorted together condition. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
13 Test the ground circuit of the PNP switch for an open. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
14 Replace the TR switch. The TR switch is part of the PNP switch. Refer to Park/Neutral Position Switch Replacement .
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 16  -
16 Perform the following procedures in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle greater than 8 km/h (5 mph) for a short distance, then stop the vehicle.
  4. Select each transmission range: P, R, N, D3, D2 and D1.
  5. Place the transmission in PARK.
  6. Select Specific DTC.
  7. Enter DTC P0706.

Has the test run and passed?		 - Go to Step 17  Go to Step 2 
17 With the scan tool, observe the stored information, capture info and DTC info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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