Medium and Heavy Trucks
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Hi my name is***** you get this resolved or still need help?
System–MID128 PSID 28
DPF differential pressure sensor value too
• Aftertreatment DPF differential
Possible filter as you thought or a DPF differential
pressure sensor issue.
MID 128 PPID 330
responding or out of
valve can't be
Yellow Check lamp
Faulty bypass valve
Check you turbo and intake piping for leaks and your bypass valve solenoid for proper operation.
Hi. Yes it is mounted to the turbo. Click on this link for the bypass valve replacement procedure and information on the valve.
Okay great. How are you making out on this?
I help on here in between jobs as time allows so if you need further help I will always respond back on my next available logins
Check to see if it is sticking or has excessive carbon build up and if so it is usually replaced as it is rare to get it functioning properly by trying to clean it
Is the solenoid functioning that moves the piston? It should not be completely jammed but the solenoid is what moves it.
Are there any leaks if you were to pressure test? This would cause low boost pressure.
If you have trouble finding a set up you could always adapt low pressure regulated air to say 15 PSI or so and then spray with soapy water to detect leaks by air bubbles. Let me know