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P0125 Diagnostic Trouble Code Discussion for September 2004

Insufficient Coolant Temperature For Closed Loop

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Trouble Ticket Help Requests for DTC P0125
Help Request Posted
1999 GMC K3500 Sierra SLT 7.4L Excessive Emissions, No Start, Poor Idle Quality, MIL Lamp on VIN: 1GTHK34J7X
P0125: Engine Coolant Temperature Insufficient For Closed Loop Fuel Control. Replaced coolant temp sensor and thermastat- tested all O2 sensors - replaced bank 2 sensor 2- run injector flow test with tech 2 - found no. 6 bad- cleaned than replaced all injectors and had fuel rail cleaned by Linder- checked removed tank cleaned- replace ...
September 27, 2004