Code Definition

P00C6 — Fuel Rail Pressure Too Low – Engine Cranking

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

About P00C6

P00C6 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P00C6 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 P00C6 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 Powertrain Control Module (PCM) on Toyota vehicles monitors fuel rail pressure during engine cranking via the Fuel Rail Pressure (FRP) sensor mounted on the high pressure rail (on direct injection engines) or the low pressure rail (on port injected engines). DTC P00C6 is set when the rail pressure fails to reach the minimum threshold required for proper injector operation within the cranking period. On modern Toyota direct injection engines, the PCM commands the suction control valve on the high pressure pump to build pressure during cranking, and the monitor starts as soon as the engine b...

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