There is recall around this error. SHould be easy fix

 

Except it is not an easy fix. What good does the remote start do us if this engine light keeps coming on when its cold!

 

Took it to the dealer, Guess they had to check for moisture in the crankcase sensor hoses, There wasn't any so they replaced the Sensor under warranty. Lights been off since 🙏

 

I work at dealer😁. Remove and clean it with high pressure air

 

Moderator edit: Posts moved and merged into one thread. Sub.


what tools would I need to do this besides an air compressor? I'm having trouble finding exactly where the crankcase sensor and hoses are...

I have a 2021 in Canada and it does this every winter. There is a TSB out now you can read on it. Its very easy to remove the sensor and clean it off and blow the hose out.

I'm having trouble finding where the sensor is....my diagnostic tool threw me this code. Is there a youtube video that walks through how to clean it off?

 

Mine just did this today, how do u fix it

 

Welcome to CF!

For your answer, please read #3 and #4 posts above yours.

 

Replace sensor

 

Dealership refuses to change the sensor!

 

My dealer just replaced sensor. Had it in stock and got a free oil change

 

Have you had trouble since replacing the sensor? I keep taking mine to dealer and they refuse to change the sensor! Haven't had my remote start for two winters now! 2022 CT4 Cadillac.

 

I took it to the dealer instead of trying to DIY. Replaced the sensor and it is good to go.

 

I had this happen two weeks ago. Dealer replaced the sensor under warranty.

Now it has happened again two weeks later - exact same code. Sigh. 2023 CT4 Sport

 

I too have a 2023 Cadillac CT5 with this issue. It's been in the shop twice and is going in again next week for this issue (3rd time this month). It's is covered in the warranty. I just wish they knew how to fix the issue. They check everything, reset the engine light. I go home it stays off for a day or so and then back on. Last time they completed bulletin PIP584D which involved blowing air and cleaning out the PCV hose. Obviously didn't work. I'm so frustrated I am looking for a new Lexus!

 

There is? I have not found it. I read where this is cause by excess cold. It just dropped down to the teens in Arkansas (this occurs rarely). My car has 68,000 miles on in. Ugh, just out of warranty.

 

Same thing. Mechanic says crank case pressure sensor needs to be replaced. It is on national backorder. We purchased an extended warranty with endurance, and as you might suspect they will not cover it. They consider that a ’hose’.

 

I just got the same code,P04FB. Cleared once then came back maybe 12 hrs later during a remote start attempt. Does in fact prevent remote start it seems. Its under factory warranty i believe, so im gonna call the local dealer.

Looks like it may have triggered a few other codes, cause scanner shows failed then successful; U04220, U0447, U0131, U1616, U1611.

It has been rather code lately, 20F and below.

2023 CT4 2.0 RWD
32200 miles

 

I keep taking mine to dealer and they refuse to change the sensor! Haven't had my remote start for two winters now! 2022 CT4 Cadillac.

 

Bought my car back in November. P04B popped maybe a week or two later. The dealer cleaned out the hose and sent me off. Light came on again after another 2 weeks. Went in and it was the same code. They said they would order the part for me and call me once it came in. Waited a month and they still don't have it. There is a dealer in novi that said they have 180 sensors on backorder. I ended up picking one up from a dealer about an hour away. I brought it to my local dealer and they said if have to pay labor since I brought in the part. So, looks like I'm fixing my car on my own at 28.5k miles. Ridiculous. I might make a video if I actually figure out where it's supposed to go. Do any of you know what the process would be for reimbursement if I had the dealer do it?

20 CT4 2.0 Sport AWD

 

UPDATE: The moment the temp hit 45 degrees later that week. Check engine light went off...no problems since. I asked my dealer about it and yes, it was the abnormally cold temperature that caused the code to go off. Temps are back to normal here in Arkansas.

 

Pretty lame since this prevents us from using remote start when we actually need it.

 

My wife has a 22 CT4 AWD Prem Lux with the 2.0 LSY in it - first owner. We had this happen a couple weeks ago and when the weather warmed up it went an away. It just came back again on Thursday or Friday. Both times her car was running real rough. I thought code would go away again but no luck. I’m in Michigan and know of the Novi dealer well. Also found the TSB on this issue.

It was way too cold here to remove the pressure sensor this weekend. I got the bright idea to use a heat gun on it. Did some research and talked to father-in-law who is a GM Engine Engineer prior to doing. I set the heat gun to 250. It was 1 degree out last night!!! Ran it about 5m pointed at sensor from an inch away, then started car. Ran heat gun for another 10m. Then cleared code. Was able to remote start. Took the car to get gas and then ran it up i75 to sashabaw road. Parked. Pulled codes again. Still in perm register, but suspect a little more driving it will clear. Started back up and drove home. Car performed great. No more roughness.

Remote started again today. Will see what we’re looking at when wife gets home.

All I can think of is we’ve had some bizarre days here in Michigan with high humidity and huge temperature drops at night. Wife has a short 6 mile ride for work. Engine never really gets hot enough long enough to evaporate any moisture off???

I use the Blue Driver OBD tool. Bought off Amazon couple years ago and sync to phone.

Will let everyone know if it stays off. Otherwise I’ll pull it and run heat gun to see if any moisture comes out.

2025-02-19 update. Multiple remote starts. 75mi driven since heat gun used on sensor and codes cleared. Pulled codes again tonight and the permanent code is gone. Vehicle feels the problem is resolved. It’s still cold as all get here was 5deg this morning and only 10deg right now.

Added photo for anyone that wants to try.

 

Could you take another photo? This is washed out on my screen. Also, a zoomed out photo showing the engine bay location would be helpful.

 

I have a 2024 silverado with the same issue and they won't do anything to fix it or relove the issue. Just say sorry the parts on back order so you will just have to deal with it. Complete nonsense $50,000 truck in Michigan with no automatic start! So what are my options?

@hammerin16ds- profanity is not permitted and has been removed from your post.
Please refer to the terms you agreed to when joining Cadillac Forums.
-Long

 

Move to Las Vegas.

 

I'll join the club 2021 ct5 i have been to dealer 4 times now. This last time they said part was in. I picked it up and they told me check engine light wasn't on. Liars, it's been on for weeks. They told me manufacturer was working on a solution and will call me when they are ready. Just got home from dealer, I'm sure light will be on tomorrow. They don't realize I was a Mechanic for 33 years. And if they knew they weren't going to replace sensor then why did I drive out to them. Pretty upset.

 

Whelp, look what showed up in the mail today…

 

I got the same letter, took letter to dealership, said that letter has nothing to do with this issue. I keep taking mine to dealer and they refuse to change the sensor! Haven't had my remote start for two winters now! 2022 CT4 Cadillac.

 

Sorry flash went off and lighting not real good on that area of driveway. I’ll pop out there during daylight here shortly and get an overview of the bay and a better zoom in view for you today.

it should be warmer today. So I’ll also fiddle with sensor to see if it seems seated well. Didn’t want to break it when it was only 1deg out. I had an issue couple years back on XT4 where check engine light kept coming on. Mass airflow sensor was not seated well, so was sucking in debris. Doesn’t seem to be case in this situation as multiple people had dealer remove and reinstall. I am wondering if during cold the plastic is shrinking too much and the o-ring isn’t big enough to account for shrinkage??? Now that I may have a no removal fix, I want to figure out root cause.

 

Got home too late yesterday. Got some photos for you and mocked them up. So I heated the "intake pressure and temperature sensor" using Wagner Furno 750 set to 250deg. I DO NOT believe this to be the correct solution. I should have heated the "Crankcase Pressure Sensor".

I started the car after 5m, then heated for 10m more. It was 1deg out last Sunday. I then cleared the codes. Turned car off and successfully tested remote start. I then took the car on a 32mi round trip. So, I think the long drive thawed out anything frozen and got rid of moisture. Clearing codes got the engine running smooth and allowed remote start.

What really has me puzzled is the car was NOT running rough when I first started it, which would seem to indicate intake sensor heating helped. But it is NOT the sensor that dealers and bulletin call out.

Four weeks ago was the first time the car threw the code in three years. If it happens again, I intend to heat the "intake pressure and temperature sensor" for 5m and start the car and see if it runs rough. The whole time the check engine light was on the wife complained about how rough it was running.

This is my OBD scanner: BlueDriver Bluetooth Pro OBDII Scan Tool for iPhone & Android -
https://www.amazon.com/dp/B00652G4TS I used drive with it in my XT4 all the time, and keep it in my XT6.

Hope this helps. Would also like to hear of any success anyone has.

 

So is the whole big deal that the remote start doesn’t work properly in very cold weather? I agree that no one wants to sit in a cold car while it warms up, and if you have the feature it should work, but it’s not like you’re getting stranded either. What are the CT4 owners in North Dakota doing?

 

If it was just remote start it would be just an inconvenience. However, ours runs awful when the light is on. Idles rough. Acceleration terrible. Overall performance horrendous. And when it’s running like this you do wonder is it going to just not start and strand you at some point.

 

And that is a valid concern…

 

Same problem here, what good does the remote start do us if this engine light keeps coming on when its cold!

 

Exactly! I keep taking mine to dealer and they refuse to change the sensor! Haven't had my remote start for two winters now! 2022 CT4 Cadillac.

 

Exactly! I keep taking mine to dealer and they refuse to change the sensor! Haven't had my remote start for two winters now! 2022 CT4 Cadillac.