Particulate Matter Sensor vs DPF sensor - are they the same - Emissions Recall Y43

[jacob302]

I typed in the VIN number for my 2022 RAM 5500 and see there is a grid heater relay recall. I requested my dealer order the part and had the recall completed today. The dealer told me there is another recall open for my truck - Emissions Recall Y43 – Particulate Matter Sensor. I was surprised for two reasons, 1) this recall does not show up for my VIN in the NHTSA database, 2) because I do see the DPF load change in my vehicle in the instrument cluster display, so I assumed I have "the sensor".

Now my question is this, is the Particulate Matter Sensor addressed in recall Y43 different from the DPF sensor ? If I do not have this sensor, should the DPF load in the dash show zero always ? I know RAM had a supply chain issue and shipped nearly 21000 trucks without a sensor and the recall is to inspect and address this. I pulled the recall notice and plan to inspect the truck when it is back from the field. In the mean time I was curious if any one else knew the difference.

 

[runamuck]

I got the letter for this one today. truck runs fine so do I want to take a chance on this one.

 

[seatrout46]

I also got this recall yesterday. Seems it is not mandatory unless you are in CA. Is this right, should it be done or not?

 

[jejb]

I got the letter for this one today. truck runs fine so do I want to take a chance on this one.

Good question. But the older trucks with this motor (19-21) do have that sensor and run fine. This recall also updates some software. And these sensors have already been getting installed in the 4500/5500 22's. So I think it's a safe update, but I don't want to be the first one in line for it either.

 

[jejb]

I typed in the VIN number for my 2022 RAM 5500 and see there is a grid heater relay recall. I requested my dealer order the part and had the recall completed today. The dealer told me there is another recall open for my truck - Emissions Recall Y43 – Particulate Matter Sensor. I was surprised for two reasons, 1) this recall does not show up for my VIN in the NHTSA database, 2) because I do see the DPF load change in my vehicle in the instrument cluster display, so I assumed I have "the sensor".

Now my question is this, is the Particulate Matter Sensor addressed in recall Y43 different from the DPF sensor ? If I do not have this sensor, should the DPF load in the dash show zero always ? I know RAM had a supply chain issue and shipped nearly 21000 trucks without a sensor and the recall is to inspect and address this. I pulled the recall notice and plan to inspect the truck when it is back from the field. In the mean time I was curious if any one else knew the difference.

Not the same sensors:

Real-time Sensing of Particulate Matter in a Vehicle Exhaust System

Onboard diagnostic regulations require performance monitoring of diesel particulate filters used in vehicle aftertreatment systems. Delphi has developed a particulate matter (PM) sensor to perform this function. The objective of this sensor is to monitor the soot (PM) concentration in the exhaust do

www.sae.org

Radio Frequency Diesel Particulate Filter Soot and Ash Level Sensors: Enabling Adaptive Controls for Heavy-Duty Diesel Applications

Diesel Particulate Filters (DPF) are a key component in many on- and off-road aftertreatment systems to meet increasingly stringent particle emissions limits. Efficient thermal management and regeneration control is critical for reliable and cost-effective operation of the combined engine and aftert

www.sae.org

 

[John Jensen]

Now my question is this, is the Particulate Matter Sensor addressed in recall Y43 different from the DPF sensor ?

I believe the recall is for the SCR (DEF) sensor. The associated software is to return the proper DEF dosing according to that sensor. Your truck came without the sensor and was programmed to inject DEF at a specific rate. You will probably see a reduction in DEF use with the sensor installed.

The Particulate Matter Sensor (EGT4 sensor) measures the NOx levels. When NOx reaches a certain level DEF is injected into the SCR to remove NO2/NOx. NOX levels trigger the DEF injection and also determines the quantity of DEF.

 

[runamuck]

in reading the whole thing, I see that if you have over 600 engine hrs., then disregard and place vehicle back in service. not sure what that means..I have around 900hrs. on the otherhand, they probably dont have this part either.

 

[runamuck]

while mine was getting the other 2 recalls done yesterday I asked about the DPF sensor pointing out that the repair sheet says for the dealer to mark "done" and return to service if the motor has over 600 hrs. mine has over 900. the service guy said it was still better to have the recall done than not so I stayed on the list for that one but he says they dont have the parts and no idea when the will get any.

 

[jejb]

I got a text today from my dealer saying I needed to schedule an appt to clear my last recall, the DPF sensor. Called the parts dept and they do not have any of the sensors in stock. Parts said they had 2 of the grid heater relays in stock, but they had a lot of the DPF sensors on order with none showing up.

 

[Jay P]

They are not likely to get the parts anytime soon. Earlier this week UAW shut down GM and Stellantis parts warehouses and distribution centers as part of the ongoing strike.

 

[jejb]

Good point. They did say the 2 grid relays had just come in today though.

 

[Jay P]

Those were probably already en route to the dealer before the strike affected parts. I don't know about Fed Ex but UPS will not cross picket lines so not likely anything will come unless already in the shippers hands.

 

[runamuck]

I got the other 2 recalls done tuesday and they said there are no parts available for the particulate matter sensor so they could not do that one. then thursday when I ran my vin thru the recall website, the sensor recall had gone away..curious. I guess the dealer cleared all 3 but only the relay and the dipstick show on the work order.