Diagnostic Aids
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
- EL-49742 harness is a good source for B+ and ground.
- The transfer case drain plug is a good source for ground.
- Typical Gear Position Sensor parameter values:
- 2WD = 33 - 43°
- 4WD/AWD Automatic = 87 - 204°
- 4WD High/Locked = 110 - 204°
- 4WD Low = -140° to -69°
- Neutral = -5° to +5°