Code Definition

P1254 — Maximum Fuel Pressure Limit

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

About P1254

P1254 is a manufacturer-specific powertrain diagnostic trouble code recorded for KGM 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.

P1254 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

DTC P1254 is set when the Engine Control Module (ECM) detects that fuel pressure in the high pressure fuel system has risen above its predetermined maximum limit. On a common rail system the ECM regulates rail pressure using the suction control or inlet metering valve on the high pressure pump and a pressure control valve on the rail, while the rail pressure sensor provides constant feedback. P1254 sets when the measured pressure exceeds the safe ceiling, which points to a regulation fault, a sticking valve, or an inaccurate pressure signal rather than normal operation. Excessive fuel pressure...

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