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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 846 (POWER STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0899TEST DESCRIPTION
1999 GMC Forward Control 5.7 R, Automatic

Test Description

1999 GMC Forward Control 5.7 R, AutomaticSECTION Test Description
WARNING: This page is about a different car, the 2003 Saturn Vue. 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:  Tests if the malfunction exists in the vehicles charging system.
  2. 3:  Tests if the malfunction is in the EPS system.
DTC C0899

Step Action Yes No
Connector End Views Reference: Power Steering System Connector End Views 
1 Did you perform the Power Steering Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Power Steering System 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn ON the scan tool
Does the scan tool power up and communicate with the Engine Control Module (ECM)?		 Go to Step 3  Go to Diagnostic System Check - Engine Electrical in Battery
3  With the scan tool observe the Battery Voltage parameter in the EPS Data List.
Does the scan tool display less than 8 Volts?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
4 Test the battery positive voltage circuit of the PSCM for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 5 
5 Test the ground circuit of the PSCM for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 6 
6 Inspect for poor connections at the harness connector of the PSCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 7 
7 Inspect for poor connections at the harness connector of the underhood fuse block stud terminal. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
8 Inspect for poor connections at the ground connector, G207. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
9 Replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 Go to Step 2  System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.