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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 992 (Power Steering System) >> Diagnostic Information and Procedures >> DTC C0550 >> Test Description

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 numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Checking to verify the DTC will not reset.
  2. 3:  Replace the EHPS powerpack.
DTC C0550

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 
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition and wait 45 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Select the EHPS module display DTCs function on the scan tool.
Does the scan tool display DTC C0550?		 Go to Step 3  Go to Diagnostic Aids
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?		 System OK -
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