How to fix code P240F - Slow EGR Response?

[Griffin3]

Hi everyone,

I have a CEL with the code P240F. Every thread on here with that code, the advice is "go to the dealer and fix it under warranty." I could not find any advice on how to fix it yourself. Any help is appreciated.

 

[oilhammer]

Well, as if it matters post-Dieselgate, but there was a software update for this issue, LOL.... TSB about it.

But usually this comes up along with a P2002 and P0401, which is indicative of a cracked DPF. Are your tailpipes sooty?

 

[Griffin3]

No, the tailpipes are very clean. I don’t have any other codes either.

 

[MrCypherr]

Ive heard of this and P2002 coming up together and only replacing the DPF but the EGR code comes back unless the cooler is replaced. Usually if the DPF is cracked, the cooler will start to soot up and well, needs replacing.

 

[Griffin3]

Thanks for the info. So just to be clear, I should remove the EGR cooler and see if it’s dirty? I really don’t know what I’m doing, I just look at forum posts and Youtube videos for whatever repair is happening that day

 

[oilhammer]

The EGR cooler on the CJAA engine is a MASSIVE undertaking to get at, I'd take the low pressure tube off first and see what you find there.

 

[MrCypherr]

Yeah take the low side tube off and you can see the port on the EGR cooler., If there is soot, usually means its gotta be replaced or that fault will most likely keep coming back.