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3.0 Duramax P1488 CEL code

Ogee1

By Ogee1
in Troubleshooting, Warranty & Recalls

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Ogee1 Enthusiast

Ogee1

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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. 

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Pinnacle
Pinnacle

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

1997SierraSLT
1997SierraSLT

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, Det

yousaveone
yousaveone

People need to quit relating the other Duramax to ours. Their not even ALMOST the same. the big diesels are designed by Isuzu and the babies by FEV. While the codes are the same in some instances this

Ogee1 Enthusiast

Ogee1

Posted
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Posted

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 New Member

Brent Judd

Posted
Posted

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 Senior Enthusiast

Colossus

Posted
Posted

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 Enthusiast

1997SierraSLT

Posted
Posted (edited)
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 by 1997SierraSLT
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Ogee1 Enthusiast

Ogee1

Posted
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Posted

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. 

  • 2 months later...
Ogee1 Enthusiast

Ogee1

Posted
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Posted

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

  • 1 month later...
Caroquintero_156 New Member

Caroquintero_156

Posted
Posted

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 Enthusiast

Ojustracing

Posted
Posted

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 Enthusiast

Pinnacle

Posted
Posted
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.

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  • 2 weeks later...
swervin36 Enthusiast

swervin36

Posted
Posted

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 Enthusiast

RockyBlue

Posted
Posted

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?

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