Code Definition

P0898 — Transmission Control System MIL Request Circuit Low

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

About P0898

P0898 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 P0898 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 P0898 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 P0898 fault code is set when the transmission control module (TCM) detects a low voltage condition in the circuit responsible for triggering the Malfunction Indicator Lamp (MIL) or 'check engine' light. This code indicates an electrical problem in the circuit that signals the vehicle's onboard diagnostic system to illuminate the MIL, specifically pointing to a low voltage issue. The MIL request circuit is a critical communication pathway used by the TCM to inform the driver of transmission-related problems via the dashboard warning light. A low voltage condition in this circuit can result ...

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