I have a 2020 Ram 5500 6.7 Cummins with a build date of 8/20
It has the revised cp4 injection pump with the big dimple on the pump.
Ever since we got this truck it makes a loud buzzing noise that cuts in and out and it’s super annoying.
I read the tsb pointing out the 2 different pumps one is asymmetrical and the updated pump is symmetrical.
It says on the tsb make sure the truck is calibrated for the correct pump otherwise you will hear noise from the injection pump.
So I thought since this truck was built in august which is right around the time they started to install the updated pumps, what if this truck was calibrated for the old style asymmetrical pump and not the uodated symmetrical.
So I took it to my local dealer and asked them to check and see if it was calibrated for the symmetrical pump and the service writer tells me they have no way of checking that.
I find that very hard to believe, she said they plugged into the truck and gave it the latest updates and that they heard no more noises from the pump.
I pick up the truck and it’s still making the same
Exact buzzing noise that cuts in and out.
So how do I proceed forward and get them to understand that I’m simply just asking them to check and see which pump this truck is calibrated too?
And has anyone else had this buzzing sound coming from the updated cp4 pump?
It has the revised cp4 injection pump with the big dimple on the pump.
Ever since we got this truck it makes a loud buzzing noise that cuts in and out and it’s super annoying.
I read the tsb pointing out the 2 different pumps one is asymmetrical and the updated pump is symmetrical.
It says on the tsb make sure the truck is calibrated for the correct pump otherwise you will hear noise from the injection pump.
So I thought since this truck was built in august which is right around the time they started to install the updated pumps, what if this truck was calibrated for the old style asymmetrical pump and not the uodated symmetrical.
So I took it to my local dealer and asked them to check and see if it was calibrated for the symmetrical pump and the service writer tells me they have no way of checking that.
I find that very hard to believe, she said they plugged into the truck and gave it the latest updates and that they heard no more noises from the pump.
I pick up the truck and it’s still making the same
Exact buzzing noise that cuts in and out.
So how do I proceed forward and get them to understand that I’m simply just asking them to check and see which pump this truck is calibrated too?
And has anyone else had this buzzing sound coming from the updated cp4 pump?