Code Definition

P1198 — Pump Rotor Control Underfuelling

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Generic

About P1198

P1198 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1198 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

This code applies to common rail diesel engines and relates to the high pressure fuel system monitoring performed by the engine ECU, commonly on the Siemens SID801 and similar systems used across PSA and Ford diesels. The ECU controls fuel delivery through the high pressure pump and its inlet metering valve, also called the flow regulator, and monitors actual rail pressure with the fuel rail pressure sensor. DTC P1198 is set when the ECU detects an underfuelling condition, meaning the pump and metering valve cannot deliver enough fuel to reach or hold the commanded rail pressure. This is typic...

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