Code Definition

C1921 — VAPS Solenoid Actuator Output Circuit Failure

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

About C1921

C1921 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 C1921 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

C1921 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 Variable Assist Power Steering (VAPS) system adjusts steering effort according to vehicle speed by controlling hydraulic assist with an electrically operated solenoid actuator. The control module varies current to the VAPS solenoid, providing more assist at low speed for parking and less assist at higher speed for stability and road feel. DTC C1921 is set when the module detects a failure in the VAPS solenoid actuator output circuit, such as an open or short, so the commanded current does not flow correctly. This is commonly caused by a failed solenoid, wiring damage, or a connector fault....

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