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Home >> Chevrolet >> 2011 >> Suburban C2500 >> Repair and Diagnosis >> External Pages >> Different car >> Section 1745 (Antilock Brake System - Hybrid (Hp2)) >> Diagnostic Information and Procedures >> DTC C1120 or C1121 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

C1120 00 

This diagnostic detects if the left front circuit is blocked by actively applying pressure and monitoring the accumulator pressure change. The pressure change of the accumulator indicates the value of fluid used which is then compared to expected fluid used during a brake apply. Too little fluid usage indicates a blocked circuit.

C1121 00 

This diagnostic detects if the left front circuit is leaking by actively applying pressure and monitoring the accumulator pressure change. The pressure change of the accumulator indicates the volume of fluid used which is then compared to expected fluid used during a brake apply. Too much fluid usage indicated a leaking circuit.

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