Hello, my name is Chris, live in Westchester New York, I have a 2021 Blazer LT AWD, got 56,000, mainly trouble free till last week, check engine light P04FB engine crankcase pressure sensor, reduced engine power and fan stays on after shutting down, replaced sensor and light still on, still same issues got appointment next week. Scanned at auto zone these other codes are there as well P0016, P05CC, P0011. Love my truck just frustrating , any help would be appreciated

 

Welcome to the forum!

Autozone reading codes is an okay thing for them to do, but they are not technicians nor do they do any diagnostics based upon the codes they pull. If you are interested in doing your own maintenance and repairs on your vehicle, which I think you are, I would suggest getting yourself a decent bluetooth scantool and a subscription to AllDataDIY or Mitchell1. We have a few threads here with some scantool suggestions.

Now, as far as your problem...

I would doubt that the PCV valve itself was faulty at such a low mileage, rather that it is a water issue in the lines blocking flow and/or preventing proper operation of the valve (ice sticking the valve open or closed). The PCV system in those vehicles is known to have issues with water accumulation that can cause issues in colder climates. Short trips that do not allow the engine to come up to full operating temperature exacerbate this issue. This time of year, my suggestion would be to get it into a heated space overnight to thaw everything out properly, then remove the PCV sensor & associated hoses to blow the hoses out. PIP5841B is what GM released on the matter which is basically what I have stated already.

To make matters worse, if the PCV valve sticks open, it often will cause excessive oil consumption as well which, if left unchecked, can lead to low oil level and can cause issues with the cam phasers (your P0011, P0016, & P05CC codes). Whether those codes were pending, current, permanent, or history...who knows. Their status is important. What I would do with the information is check the oil and monitor the situation. How long do you go between oil changes? Do you check your oil between changes? If not, you may want to start until you get a handle on things to make sure that there isn't an oil consumption issue.

 

Glad I found this site and thank you for your help. The “reduced engine power” went away yesterday along with the fan running after shut down and the check engine light went out today when I started truck to drive home, put about 25 miles of driving on. The truck has had a slight oil leak passenger side under the oil fill tube, not from the tube but down on side of engine around the alternator, very slight but I check my oil level all the time use valvoline full synthetic dexos.

 

The problem with the PCV system could have pushed a seal out, causing an oil leak. Probably not what a shop will own up to ever in that the defective PCV system caused a potentially expensive to repair oil leak, but it is very likely the root cause of said leak anyway.

What motor is in your Blazer? 3.6 v6?

 

2.0 turbo

 

Ah ok. I was hoping it was the 3.6L V-6 (LGX) as I have service info for that. I'll have to see if I can access the 2.0L I-4 turbo (LSY) info under the same vehicle since it is an optional engine for my parent's car (XT6 which is a cousin to the Blazer platform).

 

Hello I'm Chris from British Columbia,canada.i have 94 blazer tbi and changed over to a carb having trouble wiring the fuel pump and distributor power I've tried a few wires you try and start but it cuts power or pause till you release key.
Any suggestions

 

Hi Chris. Welcome to the forum, but you've asked your question in the wrong area and one someone else's introduction thread. You should create your own thread in the appropriate engine tech section to ask for help.

That being said, it sounds like you've sourced power from the accessory circuit (typically orange in your truck), not from the ignition circuit (typically pink or pink/white in your truck). The accessory circuit cuts power when the key is in the start position.