Code Definition

C1582 — Assist map number mismatch

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

About C1582

C1582 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.

C1582 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 C1582 is set when the Power Steering ECU detects a mismatch between the programmed assist map number and the assist map expected for the vehicle configuration. The assist map is a software defined curve that sets how much power steering assistance is applied for a given vehicle speed and steering torque, so the correct map must match the specific vehicle and steering hardware. C1582 sets when the wrong calibration has been loaded, when the stored configuration does not agree with the ECU programming, or when configuration data shared over the network cannot be confirmed. When this code is ...

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