[Snipesy]

Dude. You aren't going to believe this... ok maybe you will

Shortly after my last post, I went ahead and pulled both EGT 1 & 2 sensors. I discovered they were installed reversed. And yes they are different... EGT 2 probe is about twice the length of EGT 1. Also, EGT 2 sensor has a female connector end where as EGT 1 has a male connector end. Of course they match up with corresponding male & female connectors on the harness. Can you guess where this is going?

Whatever idiot did last work on this car not only swapped the install location of EGT 1 & 2, they were also connected the only way you could so that meant this whole time the ECM was reading EGT 1 data from 2's location and vice versa.

That would explain the P144E code and hence the regen failure.

I am so friggin HAPPY right now. After wiping off excess soot and reinstalling them correctly, I had an oh so successful forced regen and now sit at 0g soot mass! Took 37 minutes run time but kept a close eye on things the whole process and I am just giddy with the results.

Also kicking myself for not paying closer attention from the start.

And yes there is a simple rubber vacuum line in place of the OEM vacuum actuator control so I'll get that ordered & replaced.

Thanks soooo much for your expert help!

Jesus... EGT 1 doesn't have the 90 so how did it not get shredded by the fan? My EGT2 came free of its clips and got nicked pretty bad. I can only imagine how bad it will be if they are swapped.


100% at least get the metal portion of the vacuum line. Rubber melts. It may still be there just shoved aside for whatever reason so check for that before you order.

2014-2015 Chevrolet Cruze F Hose 55591707 GM | GMPartsDirect.com

2014-2015 Chevrolet Cruze part # 55591707 - F Hose

www.gmpartsdirect.com

2014-2015 Chevrolet Cruze F Hose 55581648 GM | GMPartsDirect.com

2014-2015 Chevrolet Cruze part # 55581648 - F Hose

www.gmpartsdirect.com

 

[jalias]

Jesus... EGT 1 doesn't have the 90 so how did it not get shredded by the fan? My EGT2 came free of its clips and got nicked pretty bad. I can only imagine how bad it will be if they are swapped.

They bent it 90...

 

[Snipesy]

They bent it 90...

Im sure they were saying “Those stupid GM engineers! Why make a sensor that hits the cooling fan! Idiots!” as they were finagling the pliers too.

 

[WillL84]

They bent it 90...

🤦‍♂️

 

[Speedbuff]

It’s the exact same procedure.

If you have an OBDLINK Gretio - Automotive Scan Tool - Apps on Google Play Gretio will have a few extra service features such as Reset Cat 1 which can sometimes help. The pid “DPF Regen Inhibit Reason” may shine some light but that’s it. There’s nothing extra with the Dealer tool.

This sounds like over temp protection. Monitor EGT 1 and EGT 2 which is pre and post DOC. You will probably see EGT 2 shoot up well into 600, 700C range. The dpf unit is probably glowing at this point.

As for why...

• Leaky injector is an obvious contender and I would say most likely if it is in fact EGT 2 over temp.
• EGR valve not closing which is causing abnormally high temps. This should give a DTC if this is the case but still a worthy contender. The EGR shall remain shut for the whole procedure.
• Throttle valve control not working correctly. Again this is pretty much always a DTC.

The DPF diff pressure sensor could also be faulty but this does not sound like the case. And again it’s highly prone to show a DTC if something is wrong.

If it is overtemp then sadly the dpf is likely destroyed at this point.

Can a forced regen be commanded by a typical snap on scan tool-or is this strictly proprietory gm territory?

 

[Snipesy]

Can a forced regen be commanded by a typical snap on scan tool-or is this strictly proprietory gm territory?

The more expensive ones yes.