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Conditions for Running the DTC C0055 00 The ignition is ON. Ignition voltage is greater than 9.5 volts. C0055 5A The ignition is ON. Ignition voltage is greater than 9.5 volts. The brake pedal is not pressed. A DTC is not set for the other wheel speed circuit on the same axle. Conditions for Setting the DTC C0055 00 An open is detected on the rear wheel speed sensor signal circuit. A short to ground is detected on the rear wheel speed sensor signal circuit. A short to voltage is detected on the rear wheel speed sensor signal circuit. C0055 5A The EBCM detects an erratic rear wheel speed signal. Action Taken When the DTC Sets The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS) for The electronic brake distribution (EBD) does not function optimally. The ABS indicator turns ON. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 Diagnostic Aids
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually. An ECE 13 response may be required, after repairs are made, and DTCs are cleared, operate the C0055 5A, 00 If the customer comments that the ABS indicator is ON only during moist environmental 1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water). 2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds. 3. Rinse the area thoroughly when completed. Reference Information Schematic Reference Antilock Brake System Schematics Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Circuit/System Testing 1. Use a scan tool in order to clear the DTCs. Cycle the ignition to OFF and then start the engine. A current failure will set a DTC. If the DTC does not reset, go to Diagnostic Aids.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Turn OFF the ignition and disconnect the EBCM harness connector. At the EBCM harness connector terminal 31 W/JF3 or terminal 20 W/JH6, test for 10 volts on the vehicle speed If the voltage is below 10 volts, test for an open or short to ground on the vehicle 3. Ignition ON, verify that a test lamp does not illuminates between the vehicle speed signal circuit terminal 31 W/JF3 or terminal 20 W/JH6 and ground. If the test lamp illuminate, test the vehicle speed signal circuit for a short to B+. If the 4. If all circuits test normal, replace the PCM. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for EBCM/BPMV or PCM replacement, setup, and programming DTC C0110 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC C0110 00 Pump Motor Circuit DTC C0110 03 Pump Motor Circuit Voltage Below Threshold DTC C0110 04 Pump Motor Open Circuit DTC C0110 61
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Pump Motor Circuit Actuator Stuck Circuit/System Description The pump motor is an integral part of the brake pressure modulator valve (BPMV), while the Conditions for Running the DTC The ignition switch is in the ON position. Initialization is complete. Conditions for Setting the DTC The EBCM motor drive circuit detects a short to battery positive, or open ground circuit, The pump motor continues to rotate briefly after activation creating a feedback voltage. The Action Taken When the DTC Sets The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle. The ABS indicator turns ON. The Traction Control and VSES indicators turn ON. The Traction Control and StabiliTrak displayed on the DIC. Conditions for Clearing the DTC The condition for the DTC is no longer present. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 Reference Information Schematic Reference Antilock Brake System Schematics
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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