Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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.

2: This step checks to see if the problem has cleared after the EHPS control module has been reprogrammed.

DTC C0564

Step	Action	Yes	No
Schematic Reference: Power Steering System Schematics Connector End Views Reference: Power Steering System Connector End Views
1	Did you perform the electro-hydraulic power steering (EHPS) Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Power Steering System
2	Install a scan tool. Turn the ignition ON, with the engine OFF. Use the scan tool to clear the DTC. Reprogram the EHPS control module. Refer to Service Programming System (SPS) in Programming. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 3	System OK
3	IMPORTANT: Always perform the calibration procedure for the brake pedal position (BPP) sensor. Refer to Brake Pedal Position Sensor Calibration Description and Operation . Replace the EHPS powerpack. Refer to Power Steering Pump Replacement (4.3L) Power Steering Pump Replacement (4.8L, 5.3L and 6.0L) Power Steering Pump Replacement (8.1L) Power Steering Pump Replacement (6.6L Diesel) Power Steering Pump Replacement (Parallel Hybrid Truck) .Did you complete the replacement?	Go to Step 4	-
4	Use the scan tool to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK