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P1232 Diagnostic Trouble Code Discussion for September 2011

Fuel Injector 4 Output Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1232
Help Request Posted
2004 GMC Sierra 2500 HD 6.6L Poor Idle Quality, Misfire VIN: 1GTHK23264
P1232: Fuel Injector 4 Output Circuit Malfunction. Truck makes loud knocking noise and puffs thick black smoke. Sounds like detonation knock. Used modis to manually shut down injectors found that when injector number 2 was disabled the knocking stopped and the smoking stopped. Checked wiring at FICM and a inje...
September 02, 2011