2001 lb7 injectors or ficm - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 1 (permalink) Old 01-06-2020, 12:46 PM Thread Starter
Join Date: Jan 2020
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2001 lb7 injectors or ficm

Just recently started driving my 2001 lb7 again after rebuilding the front end completely. Ran and drove wonderfully, recently replaced the cp3 as well. anyway a few days after i had started driving it again i was driving down the highway running about 70 75, no problems until i turned off the highway. i Stepped off in in and it sounded like a 6.0 power stroke. never showed any codes until i had driven it with this problem for a few days. when it did show a code it was p0203 i believe which would be cylinder #3 injector wiring fault. i had been driving it with only one battery and i have read that if there is not enough voltage going to the ficm it can fry it or at least screw with it. ive ran the injector rates and all of them were -4 or -5 but #1 #3 and #7 and they were +1. theres no blowby what so ever so i dont believe it dropped a injector tip. if anyone can help me that'd be great. thanks!
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