Circuit/System Verification

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Verify the range selector lever cable adjustment is correct. Refer to Range Selector Lever Cable Adjustment .
- If the range selector lever cable adjustment is not OK
  Adjust, repair or replace as necessary.
- Go to next step: If the range selector lever cable adjustment is OK
Ignition On.
Verify the scan tool Engine Control Module Park/Neutral Position Switch parameter displays Park/Neutral when in Park or Neutral and In Gear when in Reverse or Drive range.
- If Park/Neutral or In Gear is not displayed correctly
  Refer to Circuit/System Testing.
- Go to next step: If Park/Neutral or In Gear is displayed correctly
Verify the scan tool the 9 V Reference 1 and 9 V Reference 2 Circuit Status does not display Malfunction.
- If Malfunction is displayed
  Refer to Circuit/System Testing.
- Go to next step: If Malfunction is not displayed
Verify the scan tool the internal mode switch A/B/C/P/S circuit voltages are correct for Park, Reverse, Neutral, Drive and Manual Mode position. Refer to Transmission Internal Mode Switch Voltage .
- If the circuit voltages are not OK
  Refer to Circuit/System Testing.
- Go to next step: If the circuit voltages are OK
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
  Refer to Circuit/System Testing.
- Go to next step: If the DTC does not set
All OK.