Conditions For Setting DTC P0503
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
DTC will set under the following conditions:
- Transmission is not in Park or Neutral.
- DTC P1810 (TFP position switch) is not present.
- DTC P1875 (4WD low switch) is not present.
- No TFP position switch changes for more than 10 seconds.
- No 4WD low switch change within 2 seconds.
- No OSS increase more than 250 RPM within 2 seconds.
- Output speed has dropped more than 1000 RPM for at least 4 seconds.
- Vehicle is not in 4WD low.