Code Definition

C1203 — ABS Outlet Valve Coil Rear Circuit Open

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1203

C1203 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1203 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1203 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The ABS hydraulic control unit (HCU) contains a series of solenoid valves that the ABS module pulses open and closed to modulate brake pressure at each wheel during an ABS event. The rear outlet (dump) valve releases pressure from the rear brake circuit back toward the accumulator when the module detects impending wheel lock. DTC C1203 is set when the ABS module detects an open circuit in the rear outlet valve coil or its control wiring, meaning the solenoid winding is not drawing the expected current when the driver stage energizes it. When this code is active the ABS, traction control, and s...

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