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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTILOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0221-C0227 (W/O JL4)TEST DESCRIPTION
2006 Chevrolet Suburban C2500, 6.0 U

Test Description

2006 Chevrolet Suburban C2500, 6.0 USECTION Test Description

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

  1. 3:  This step measures the resistance of the wheel speed sensor in order to determine if the sensor has a valid resistance value.
  2. 4:  This step ensures that the wheel speed sensor is generating a valid AC voltage output.
DTC C0221-C0227 (W/O JL4)

Step Action Values Yes No
Schematic Reference: ABS Schematics 
Connector End View Reference: ABS Connector End Views 
IMPORTANT: If DTC C0229 is set, diagnose DTC C0229 before diagnosing any other wheel speed sensor DTCs.
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Use a scan tool in order to clear the DTCs.
  2. Operate the vehicle at a speed greater than the specified value.
Does the DTC set?		 19 km/h (12 mph) Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn OFF the ignition.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Disconnect the wheel speed sensor connector.
  4. Use a DMM in order to measure the resistance across the wheel speed sensor.
Does the resistance measure within the specified range?		 700-10,000 Ω Go to Step 4  Go to Step 8 
4 
  1. Spin the wheel by hand as fast as possible.
  2. Use a DMM in order to measure the AC voltage across the wheel speed sensor as the wheel spins.
Does the AC voltage measure greater than the specified value?		 100 mV Go to Step 5  Go to Step 8 
5 Inspect for poor connections at the harness connector of the wheel speed sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6
  1. Disconnect the electronic brake control module (EBCM) harness connector.
  2. Test the wheel speed sensor circuits for the following:
    • An open
    • A short to ground
    • A short to voltage
    • Shorted together
Refer to Circuit Testing and to Wiring Repairs .Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
7 Inspect for poor connections at the harness connector for the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8 Replace the wheel speed sensor. Refer to Wheel Speed Sensor Replacement - Front (2 Wheel Drive)  or Wheel Speed Sensor Replacement - Front (4 Wheel Drive) .
Did you complete the replacement?		 - Go to Step 10  -
9 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
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, as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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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.