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Sooner or later, most + LLY/LBZ/LMM Duramax s will experience the dreaded injector harness problem GM routed the fuel injector wiring harnesses very tight on Failure of these connectors can cause the truck to have a hard engine knocking noise and/or multiple injector control circuit codes. Install Instructions. 5 GM 6.6L Duramax LLY. Restore your vehicle's fuel economy, and return your diesel engine to its original performance, with our Fuel Injection Harness. This kitThe high-pressure side of the fuel system is pressurized up to 23,200 PSI and the injector wiring high voltage is 50 volts. Make sure the engine is off, the Lly updated injector harness install #05-06-04-047C: Service Engine Soon (SES) Light On with Reduction in Engine Power, DTCs P0202 and P2149 or P0207 and Fuel return Banjo bolt to head: 12 lb-ft. Lower valve-cover bolts: 89 inch-lbs. (twice); Injector wiring harness bracket: 80 inch-lbs. Injector terminal