Code Definition

P1198 — Pump rotor control underfuelling

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

About P1198

P1198 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. 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 Ford diesel code relates to the electronic control of the fuel quantity within the rotary distributor injection pump, where a rotor and quantity control mechanism meter the fuel delivered to the injectors. DTC P1198 is set when the Engine Control Module (ECM) determines that the pump rotor control cannot achieve the commanded fuel quantity and the engine is being underfuelled, meaning actual delivery falls short of demand. This can result from a restricted fuel supply to the pump, air in the fuel system, low internal transfer pressure, wear inside the pump, or a fault in the electronic qu...

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