Misfire, rough running, surge, chuggle, and possible MIL/SES light on. LLY
this is for the lly engines, whenever there is a Misfire, rough running, surge, chuggle, and possible MIL/SES light on.
Typically there is a wiring harness issue and injectors often don't have to be changed even when there is a high injector balance rate showing. If you were to follow the actual diagnostic steps for these codes P1223, P1226, P1229, P1232, P1235, P1238, P1241 or P1244 and get through all the steps you could very possibly end up replacing a FICM that is still good. so before you go adress those codes physically be sure to read this bulletin. Models: 2004-2005 Chevrolet Kodiak, Silverado 2004-2005 GMC Sierra, Topkick with 6.6 Engine (VIN 2 - RPO LLY) Condition/Concern: Misfire, rough running, surge, chuggle, and possible MIL/SES light on. Recommendation/Instructions: Do not replace fuel injectors for trouble codes P1223, P1226, P1229, P1232, P1235, P1238, P1241 or P1244. When these codes are set, there is either a wiring concern between the Engine Control Module (ECM) and the Fuel Injection Control module (FICM), or a concern with the control module itself, (ECM/FICM). If there is a concern on the injector driver circuits (open, short to ground or high resistance), it is possible to have a high injector balance rate. 1. Diagnose all injector driver codes using the current repair information diagnostics. 2. If all repair information diagnostics are inconclusive, inspect for wire chafes at the Fuel Injector Control Module (FICM) wiring harness brace. The wiring harness brace is located 4 to 6 inches away from the FICM connectors. The wiring harness is nylon tied to the wiring harness brace. It may be necessary to remove the nylon tie to inspect the harness. Repair any wire chafes following repair information wire repair procedures. Insulate the harness with wiring conduit or a suitable material so the wires will not chafe again. 3. Also inspect the C107 connector for wire chafes. The C107 connector is found Source: GM Preliminary Information Bulletin #PIP3394E – (02/01/2008)
above the left (driver side) rocker cover. The wiring harness may relax and lay on top of the C107 support brace. This support brace is located right below the C107 connector. Repair any wire chafes following repair information wire repair procedures. Insulate the harness with wiring conduit or a suitable material so the wires will not chafe again. |
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