Code Definition

C1554 — Power Steering Relay Fault

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

About C1554

C1554 is a manufacturer-specific chassis diagnostic trouble code recorded for Toyota vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

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.

C1554 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

DTC C1554 is set when the Power Steering ECU detects an abnormal condition in the power steering relay circuit. The ECU controls a built in or external relay that supplies high current to the electric power steering motor or assist circuit, and it monitors the relay so it can confirm the relay switches on and off in step with its commands. C1554 sets when the relay does not respond correctly, for example by being stuck open, stuck closed, or showing abnormal voltage or current feedback. When this code is set the power steering assist may be reduced or lost, steering effort may increase noticea...

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