Not really safe. The exhaust gases need to be guided away from the vehicle. If the exhaust comes out there it could melt something in the area or worse poison you with carbon monoxide.

Have you filled the oil back up? Low oil level can cause the P0014.

Have you ever replaced or at least cleaned the Camshaft Position Actuator Solenoid CPAS (sometimes called the Variable Valve Timing VVT solenoid)? It has metal screens that can plug up with little bits of metal or crud. This is one of the most common problems and it’s pretty easy to fix. Do a youtube search for “how to clean trailblazer VVT solenoid” or something similar.

If it’s not leaking the oil, then it’s burning it. Time to pull the spark plugs and check them.

Is it 4 wheel drive? I replaced my power steering lines and it was difficult. I’m fairly good with mechanic work and have replaced other things easily: control arms, struts, water pumps, alternators, etc. But if I ever have to do the power steering lines again on the Trailblazer I’ll take it somewhere and pay them. Is it leaking at the line above the driver side strut tower? I considered getting some swagelok couplers so I could cut out the rusty section.

I think I was supposed to drop the rack to reconnect the power steering lines but I left it in place. The hard part was keeping the cup seals aligned and in place while lining them up with the ports and then pushing in, while trying to start the 8 mm bolt. There is very little space to work unless you drop the rack. Then it was also a pain to run the line over to the power steering pump because I had to remove the air box and washer fluid reservoir so I could get a wrench on the line. The small bolt holding the power steering lines at the bottom of the engine was also awkward and required a knuckle with tape wrapped around it.