Code Definition

P0858 — Traction Control Input Signal Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0858

P0858 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0858 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0858 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0858 fault code is set when the vehicle's control module detects a low voltage condition in the traction control input signal. This indicates that the signal received from the traction control system, essential for managing vehicle stability and traction control, is below the expected voltage range. A low voltage signal can result from an electrical issue such as a short to ground, leading to incorrect or inadequate functioning of the traction control system. This could potentially affect the vehicle's handling and safety, as the control module relies on accurate signals to adjust the tra...

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