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P1237 Diagnostic Trouble Code Discussion for November 2021

Fuel Pump Secondary Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1237
Help Request Posted
2004 Ford E-250 4.6L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1FDNE24LX4
... fpdm- and fuel pump, and the pig tail to the fpdm.as the vehicle starts to warm up it sets a pending code for a p1237- after awhile it sets a code p1233, then it starts to run rich. The short trims are at -25/-30 and...
November 05, 2021