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

5 stars because it does what it's intended. However, check the wiring before using.Mine was wired in reverse polarity, therefore, would not work.Furthermore, the ground pin was in the wrong spot and needed to be moved to pin one. I referred to the sloppy mechanics wiki to get the proper pin connections.Additionally, the connector to the PCM is pretty cheap and doesn't fit great.Lastly, this works just fine and does exactly what you expect it to do. I was able to read and write without upgrading the power supply though I was fully prepared and okay with doing so.UPDATE 4-16-2024,I ended up upgrading to a larger power supply as the one supplied would not work on the P59 pcm. If your on a 512 P01 pcm it should work but be ready to upgrade the power supply potentially.

Power was connect to ground and ground to power. The ground pin is in the wrong location, you will have to pin it to #1. The supplied power supply is not strong enough to support writing to the PCM. Found an old firetv power supply and that was able to get the harness to both read/write.

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

I purchased this so I could do off-board programming on a GM PCM (2005 Silverado 5.3.) The power supply was too small, most of the wires did not make it into the crimps, and the Ground wire did not connect to any of the ground pins of the PCM. Moving the ground, soldering all of the connections and jumper wiring it to a battery it almost worked. After programming, if you completely remove the power, the software stays but the VIN doesn't lock in, so I had to add a switch to the ignition lead, now it works fine. So really, I used the PCM connector and the DLC only, but I did get my truck done.

The ground wire was pinned out to a sensor ground pin (pin 60) rather than one of the proper PCM grounds. They are likely connected together internally inside the PCM so it would probably power the controller anyway but it might not provide reliable power.The wiring on the wall plug is very thin and has no strain protection so it will be prone to damage unless you take special care of the product.The OBD2 port appears to be of good quality, no concerns there.The last comment is on the connector itself. The blue connector guards are quite loose on the white connector base, almost as if the connector is a poorly fitting replica. I've not looked at many GM PCM connectors so I'm not sure if this is common or not.Overall, I expect this product to work but it does not follow best practices and is far from professional grade.

It is cheap but it can work. I found that they wired mine right but the power supply is too weak. It would only read with my wireless OBDlink MX, it wouldn't write. I switched out to a better 12 volt power supply and my OBDlink still wouldn't write. I had to use an OBDX Pro wired or HP tuners wired to get it to write. LS droid says the computer should be at 13 volts and I see folks recommending the Belker 45w Universal power supply for clean power to write. I am going to order one and see if my OBDlink MX will work on wireless.It isn't a bad deal but know that the power supply (which looks the same as the another more expensive ones on Amazon) will need to be replaced. There also isn't a switch to turn the computer on and off for the key cycle. But it is cheap....

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.