3.0 Duramax P1488 CEL code

Ogee1 · February 10, 2020

Hey everybody, I’m new to the forum and had a question. Has anybody had the P1488 engine on their new 3.0 Duramax? What was the dealerships fix? Thanks in advance for your responses.

ILSilverado · February 10, 2020

I would give the Dealer a call. I tried looking it up but came up short.

redwngr · February 10, 2020

Did you get a description when you got the code number?

Ogee1 · February 10, 2020

A little more info on this issue. I have been to the dealership for this issue about 2 weeks ago. They determined that the code was the result of a bad particulate filter pressure sensor. I had to wait for the part to come in. They replaced it on 2/7/20 and the CEL came on again on 2/9/20 for the same code, which was verified through On star. I’m waiting on a call back from dealer now.

Thanks

Brent Judd · February 18, 2020

I just had this code come up on mine today. 2000 miles on the truck. Any word of what is going on? I’m calling the dealer tomorrow.

Brent Judd · February 18, 2020

The codes tells me it is a 5 volt reading but could be anything from exhaust, starter electrical circuit, water in fuel, EGR, etc.. A long list of possible problems.

Colossus · February 18, 2020

Welcome to the life of "modern" diesel emissions. The nightmare all diesel manufacturers have to deal with. I don't think there is one manufacturer that has this issue figured out.
Ever wonder why Crapota doesn't want to bring diesel engines to their American vehicle line-up? The DPF/DEF nightmare would ruin their reliability ratings.

1997SierraSLT · February 18, 2020

8 hours ago, Colossus said:

Welcome to the life of "modern" diesel emissions. The nightmare all diesel manufacturers have to deal with. I don't think there is one manufacturer that has this issue figured out.
Ever wonder why Crapota doesn't want to bring diesel engines to their American vehicle line-up? The DPF/DEF nightmare would ruin their reliability ratings.

Toyota is intelligent enough to not release unproven and unreliable garbage to market and allow their customer base to be guinea pigs.

One would think companies such as Caterpillar, Detroit Diesel, Mercedes, and Isuzu have got it figured out since there are millions of these engines used in various vehicles on the road each day.

Edited February 18, 2020 by 1997SierraSLT

Ogee1 · February 18, 2020

I took my truck back to the dealership to look into the issue again. According to the service rep, they couldn’t figure out why it was displaying the code again. They contacted one of the engineers at GM, and he told them to do an ECM reset. Since doing the ECM reset, my truck hasn’t shown the code again. There has been about 300 miles put on my truck since. I’m keeping my fingers crossed. Hope you get your issue resolved and mine stays resolved. I’d be interested to hear what your dealership comes up with as far as resolving your P1488 CEL.

Ogee1 · May 14, 2020

Hey Brent, I was wondering if the dealership ever figured out what your P1488 code was. My dealership has yet to figure mine out. I would appreciate your response if they did fix your new trucks problem.Thanks

Caroquintero_156 · June 17, 2020

Having the same issue. Bought the truck new in February 2020. At 1600 miles CEL came on and Onstar diagnostics gave me error code P1488. Took it to dealer and they did a manual regen and code cleared. At 2000 miles CEL light again and same code. They did another manual regen and said it was a participant matter sensor safety tube. At 2700 miles CEL light again and same code. Dealer did manual regen and flashed the computer. At 3600 miles and CEL light and same code AGAIN! Took it back to dealer and now they are saying it is the participant matter sensor that is bad, but...they don’t have any in stock and they can’t find anyone at GM that does, and the part is back ordered and they don’t know when it will be available.

Ojustracing · June 21, 2020

Was reading over the GM OEM repair information(I don't work for GM). This particular code repair tree has what I call poor diagnostics. You don't check wiring at all. Basically if the code sets and there is no other codes. Replace the Exhaust Particulate Matter Sensor. Hopefully GM will get to the bottom of it.

Pinnacle · June 22, 2020

On 2/18/2020 at 12:08 AM, Colossus said:

Welcome to the life of "modern" diesel emissions. The nightmare all diesel manufacturers have to deal with. I don't think there is one manufacturer that has this issue figured out.
Ever wonder why Crapota doesn't want to bring diesel engines to their American vehicle line-up? The DPF/DEF nightmare would ruin their reliability ratings.

Shut up with your crapota bullshit already and dont come on here saying no maker has this figured out dont speak on behalf of other makers you know nothing. Toyota has the best diesel around the world period.

swervin36 · June 30, 2020

Just had my check engine light come on again. OnStar diag came back with the same code P1488. The truck has already been back to the dealer for this about 500 miles ago. They said that there was a firmware update that they installed and it should fix the issue. Well I guess it didn't. I have an appointment in the morning to get the truck looked at.

RockyBlue · July 1, 2020

I have been dealing with this issue as well. Been to the dealer 3 times since purchasing my 2020 Duramax I6. Parts are hard to come by so I will wait for my second sensor replacement. Had the software update as well. This issue is certainly temperamental. It comes and goes without any reason that I can tell. I see that there are mostly people on this forum from altitude. Maybe this has something to do with it?