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.
- 2: This step checks to see if ECU temperature is greater than 125°C (257°F).
- 3: This step checks for leaks in the hoses and fluid level.
- 4: This step checks for a blockage in the hoses.
DTC C0485
| Step | Action | Value(s) | 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 |
|
125°C (257°F) | Go to Step 3 | Go to Diagnostic Aids |
| 3 |
|
- | Go to Step 6 | Go to Step 4 |
| 4 | Check for a blockage in one of the steering pump hoses. Did you find and correct the condition? |
- | Go to Step 6 | Go to Step 5 |
| 5 |
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 6 | - |
| 6 |
|
- | Go to Step 2 | System OK |