X15 2450 low power

[migueljc]

hello everyone. I own a Peterbilt 22 x15 CPL5770 serial 80356908 I’m experiencing lost power and high fuel consume 5 mpg no codes no mechanical issues I suspect bad ECM any suggestions or mechanics interested on work in

[tree98]

Poor fuel mileage and loss of power is extremely broad. Can you give us more details? What is the max boost in a hard pull?

When is the last time you did an EGR tuneup?

Has it had any work done to it ? New injectors installed?

Is it stock or demandated? If it's demandated you need to copy the file out and send it to Rawze for review.

[migueljc]

max boost around 28 I tink it is low. no recently jobs or injectors i recently bought this truck.

[tree98]

Did you buy it in this condition or has it declined since you bought it?

Is it demandated?

[migueljc]

it have been getting worse. it’s stock. I bought from a big fleet I’m the second owner. I have noted when it lost power Iost power I have to pull out after re star the engine it improves performance a little bit unless to run at 65 mph

[tree98]

Do an EGR tuneup and see if it improves. The cans probably need baked too. How many miles are on it?

[migueljc]

Currently 450k miles on it.

The DPF filters have been cleaned by the dealer before I bought it. KW declares.

[Rawze]

(01-25-2026 )migueljc Wrote:  Currently 450k miles on it.

The DPF filters have been cleaned by the dealer before I bought it. KW declares.

that does not mean much of anything. They only do that so it does not fault out during a test drive.

DO an EGR tune-up... replace all related sensors, etc. .... The steakers$its are not about to do any of that.

info: https://rawze.com/forums/showthread.php?...30#pid7030

[migueljc]

I’m going to do the egr tune up.

I have replaced the map and exhaust gas pressure sensor already