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Home >> Cadillac >> 2005 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Antilock Brake System And Traction Control System) >> Diagnostic Information and Procedures >> DTC C0055: Rear Wheel Speed Sensor Circuit >> Test Description
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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. 3:  This step tests for a voltage signal from the PCM.
  2. 4:  This step tests for a missing or erratic vehicle speed signal from the PCM. An assistant may be required to perform this test.
DTC C0055

Step Action Values Yes No
Schematic Reference:  ABS Schematics  
1 Did you perform the ABS Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - ABS 
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?		 13 km/h (8 mph) Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn OFF the ignition.
  2. Disconnect from the EBCM, the harness connector containing the vehicle speed signal circuit.
  3. Turn ON the ignition.
  4. Use a DMM in order to measure the DC voltage between the vehicle speed signal circuit and a good ground.
Does the voltage measure greater than the specified value?		 10 V Go to Step 4  Go to Step 7 
4 
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Place the transmission in neutral (N).
  3. Set up the DMM in order to measure the DC voltage between the vehicle speed signal circuit and a good ground.
  4. Slowly spin the rear wheels by hand for at least 30 seconds and while ensuring the driveshaft is rotating, observe the DMM.
Does the voltage measure within the specified range for the entire time that the driveshaft is rotating?		 5-7 V Go to Step 5  Go to Step 7 
5 Inspect for poor connections at the harness connector of the EBCM. 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 6 
6
IMPORTANT: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM. Refer to Electronic Brake Control Module Replacement .Did you complete the replacement?		 - Go to Step 10  -
7 Test the vehicle speed signal circuit for an open, a short to ground or a short to voltage. Refer to Circuit Testing and Wiring 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 harness connector of the PCM. 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 
9
IMPORTANT: Perform the setup procedure for the PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.3L, Powertrain Control Module (PCM) Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L, Engine Control Module (ECM) Replacement in Engine Controls - 6.6L or Powertrain Control Module (PCM) Replacement in Engine Controls - 8.1L.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 3  System OK
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