2017 l5p: P0204, p0300

[DmaxMaverick]

I don't recall the L5P has an FICM. I think they went with the wind after the LLY. The injectors are micro-piezo fired, and don't require a driver, in the traditional sense. Regarding the harness, and note I am not certain, the opposite bank harness should be the same. If you can, try swapping them to find out if the problem follows the harness, or stays with the cylinder/injector. L5P diagnostics is difficult, so far. Although there are a bunch of them around, they just don't seem to be having many specific problems. Most issues I've seen apply to most late model Diesels. Almost all issues I've seen are cured by removing or resetting power adding modules, restoring the (modified) PCM calibration, or involve the after-treatment systems.

[chessy56]

Thanks 'Maverick for the tips. Pigtail replacement connector ordered. I noted a couple of YouTube vids on replacing this connector (#7 on one, #4 on another). Looks like the wires are not polarity dependent. ACD #PT3739; GM #19368140 Little over $60 through Amazon. Noted an article that documented 3 common problems with the L5P, one being the #4 injector- but not so much the injector itself, but the connector. Same article stated a connector pigtail for an LBZ would be better, but aren't those injectors Bosch? Wouldn't a connector intended for a Bosch be different from the (Denso), or do they use the same connect interface? Curious to know as the same article referenced both the LB7 pigtails and the gold plated ones.