Code Definition

C1898 — Steering VAPS II Circuit Loop Open

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

About C1898

C1898 is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1898 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.

C1898 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 controls steering effort by varying current to an electronic power steering control valve solenoid, the EVO actuator, on the steering gear or pump. The VAPS module drives the solenoid on one circuit and monitors the return current on a second circuit to confirm the loop is continuous. DTC C1898 sets specifically when the module detects an open circuit in this solenoid loop, meaning no current is flowing through the solenoid, drive wire, or return wire. With this code set the system loses variable assist and reverts to a default fixed assist leve...

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