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DTC C0121 Circuit Description The solenoid valve relay supplies power to the solenoid valve coils in the EBCM. The solenoid valve relay, Conditions for Running the DTC The ignition switch is in the ON position. Conditions for Setting the DTC z DTC C0121 will set anytime the solenoid valve relay is commanded on and the EBCM does not see z DTC C0121 will set anytime the EBCM commands the solenoid valve relay off and battery voltage is still Action Taken When the DTC Sets If equipped, the following actions occur: z The EBCM disables the ABS/TCS/DRP for the duration of the ignition cycle. z A malfunction DTC is set. z The ABS indicator turns ON. z The TRAC Off indicator turns ON. z The Red BRAKE Warning indicator could turn on. Conditions for Clearing the DTC z The condition for the DTC is no longer present and the DTC is cleared with a scan tool. z The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC Diagnostic Aids z It is very important that a thorough inspection of the wiring and connectors be performed. Failure to Did you complete the repair? Step 8 - 8 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
2004 Hummer H2 2004 BRAKES Anti-Lock Brake System - Hummer H2
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