GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon - 2WD 🢒 Suspension 🢒 Real Time Damping (RTD) 🢒 DTC C0575, C0580, C0585, or C0590

Circuit Description

The shock solenoid valve is driven ON and OFF by the suspension control module. To activate the solenoid it is initially subjected to full battery voltage for a short period of time. Once the solenoid is pulled-in the supply voltage is pulse width modulated (PWM). The amount the shock solenoid valve is activated is based on inputs from the driver (Tow/Haul Switch), road inputs, and the powertrain control module.

Conditions for Running the DTC

The suspension control module performs a test on each shock solenoid valve during both the ON and OFF states.

Conditions for Setting the DTC
    • A short to ground in the control circuit of the shock solenoid valve.
    • A short to voltage in the control circuit of the shock solenoid valve.
    • An open in the control circuit of the shock solenoid valve.
    • An open in the solenoid low reference circuit of the shock solenoid valve.
    • A short to voltage in the solenoid low reference circuit of the shock solenoid valve.

Action Taken When the DTC Sets
    • The shock solenoid valve will be disabled.
    • All shock solenoid valves will be disabled.
    • The SERVICE RIDE CONTROL message will be displayed.
    • Stores a DTC C0575, C0580, C0585 or C0590 in the suspension control module memory.

Conditions for Clearing the DTC
    • The suspension control module no longer detects a problem in the solenoid low reference circuit or the control circuit of the shock solenoid valve.
    • Using the scan tool.
    • A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids

If DTC C0870 or C0690 is present, repair the malfunction for these DTC's before diagnosing DTC C0575, C0580, C0585 or C0590.

It may be necessary to check Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

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

  1. Tests for low reference circuit of the suspension damper solenoid. The ESC module supplies ground of the suspension damper solenoid.

    2.

  2. Verifies that the resistance of the suspension damper solenoid.

    3.

  3. Tests the control circuit to the suspension damper solenoid for an open and short to voltage.

    4.

  4. Tests the control circuit for a short to ground.

  5. Replace and program the electronic suspension control module.

Step

Action

Value(s)

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Important: If DTC C0870 or DTC C0690 is present, perform the diagnosis for these DTCs first.

Did you perform the RTD Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Real Time Damping

2

  1. Turn ON the ignition, with the engine OFF.
  2. Probe the low reference circuit of the suspension damper solenoid with a test lamp that is connected to a positive battery voltage circuit. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 8

3

  1. Turn OFF ignition.
  2. Disconnect the suspension damper solenoid connector at the shock absorber.
  3. Measure the resistance from the control circuit of the suspension damper solenoid to the low reference circuit of the suspension damper solenoid on the shock absorber.

Does the resistance of the shock absorber measure within the specified value?

1.5-3.3 ohms

Go to Step 4

Go to Step 6

4

Test the control circuit of the suspension damper solenoid for a short to voltage and an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 5

5

Test the control circuit of the suspension damper solenoid for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the suspension damper solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 9

7

Inspect for poor connections at the harness connector of the suspension control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

8

Test the low reference circuit of the suspension damper solenoid for an open and short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

9

Replace the shock absorber. Refer to Shock Absorber Replacement in Front Suspension or Shock Absorber Replacement in Rear Suspension.

Did you complete the replacement?

--

Go to Step 11

--

10

Important: After suspension control module replacement, use scan tool to perform the set up procedure located under Special Functions (F8: Recalibration) for the suspension control module.

Replace the suspension control module. Refer to Electronic Suspension Control Module Replacement .

Did you complete the replacement?

--

Go to Step 11

--

11
  1. Use the scan tool in order to clear the DTCs .
  2. 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