LS Gen 3 ECM Engine Programming Control Module Reader Diagnostic PCM Bench Harness w/Power Supply Fits for GM Chevy All Blue/Red & Blue/Green 1999-2007, OBD2 Port, 18 Gauge, 12 Volt

Worked just fine for me on a P59 PCM

Pull the grey plastic cover off, has 6 plastic tabs you have to push in with a small screw driver. Now unwrap the electrical tape you will see 2 brass colored crimps holding the positive and negative wires together and there just wrapped touching each other aka a DIRECT SHORT!!! Rewrap them separately so they cannot touch and click the grey cover back on and your good, it will work. You can replace the 12v power adapter also if your worried because it is of very low quality and just barely enough Amperage to be safe for tuning. Personally 12v-2amp or 14v-2amp or I bought an adjustable 5-24v 3amp(75w) adapter and set it to 14v and when writing or reading it maybe brings the voltage down to 13.6v-13.8v which makes me feel very safe about not bricking a PCM but the OEM power supply did work after I fixed the short, it's your choice if you want to replace it for a better unit. Still shouldn't be this way but wasn't worth returning for the price because it was so cheap. Just buying the peices seperatly would cost more so your call. Happy Gen3, Gen4 Tuning guys!

Works as intended when using HP tuners to Bench flash P01/P59 411 PCM's.Recommend double checking power supply wires are going to correct polarity based on other reviews but mine was correct out of box. Would recommend, saved me time over making one, well worth the $36 it costs.

A wire was in the wrong pin location

It needs to be upgraded to write to an ecm, but it's a great base to work from. Exceptional value given the cost of the individual parts.

Finally tried to use this. The polarity was reversed on the power adapter. Obviously no quality control from the manufacturer.

Works great!! Took a bit to figure out my interface. Went with a obdlink sx.Had some firmware issues with the OBDLINK. It would only work with windows 10! 7 was a bust no driver support, for those that need to know. Otherwise I'm happy.

If you buy one of these. Please that the tape off. This is how I found mine right out of the box. It was all taped together and not separated. They was touching together. But I only took mine apart to splice in and use a 12 volt 5 amp and I had read the other reviews and seen this. Haven’t tested it yet. Will be doing it tomorrow. Hope this helps someone. I’ll leave more feedback after the test.———— Update this thing works great. After fixing it.