Test Description

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

3: Because the TCM supplies the ECM with vehicle speed, the TCM will also have set a DTC.

DTC P0500 (4.6L)

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Install a scan tool. Turn ON the ignition, with the engine OFF. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the ECM Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and TCM. Using the Clear Info function erases stored DTCs in both the ECM and TCM. Record the Freeze Frame and Failure Records. Did you record Freeze Frame or Failure Records for a U code?	-	Go to DTC U0100-U0299 in Computer/Integrating Systems	Go to Step 3
3	Did you record Freeze Frame or Failure Records for DTC P0722 or P0723?	-	Go to DTC P0722 or DTC P0723	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information