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Old 08-21-2010, 03:16 PM
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Limp Mode... Forced Regen???

I need some insight guys.

I was pulling into the parking lot of the local Target in my truck today and all of a sudden, the gas peddle doesn't work. I park the truck and it goes into high idle. At this point I am wondering if it is some type of forced regen process, so I let the truck run for a half hour. It never comes out of high idle and giving it gas does nothing to affect the RPM's. However, if I hit the brake, it will idle back down. So, I am forced to drive it back home and just let the high idle push me home at about 20 mph since the truck is ignoring the gas peddle. I did see the "cleaning particulate filter" flash once, but it had been at high idle for an hour and would not come out of limp mode.

So, I shut it down and pulled four codes:
P0652 Sensor Reference Voltage B Circuit Low
P2452 Diesel Particulate Filter Pressure Sensor A Circuit
P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low
P2002 Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

I have an S&B CAI, so I have received P2002 before. But it is the first time for the other codes. The truck is an '08 and bone stock other than the S&B.

Thoughts??? Is anybody familiar with these codes or had this happen before?
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Old 08-22-2010, 07:52 AM
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I have seen this before.

The concern was there when the truck arrived at my dealer. By the time I had gone to get the scan tool, and came back out to the truck, the concern was gone. Could not duplicate, ever. It had just had a PCM, pedal, and DPF pressure sensor changed at another dealer.

You have a short somewhere, dropping VREF voltage. It's going to be not very much fun to find, I'm thinking.

You could also have a faulty sensor on the VREF output from the PCM...

Either way, it's not fun to diagnose, even less fun to fix. I had almost 8 hours tied up in searching for this thing, engineering was no help.

Still never found it, and the concern has never come back, and it's been over a year.

Keep me posted with what you find.
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Old 08-22-2010, 11:50 AM
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I crawled under the truck to take a look at everything this morning. The EGR Valve Pressure Sensor has been melted into a giant, unusable piece of crap.

I have been thinking about a DPF delete and tuner. As a matter of fact, I have been looking at the H&S Mini Maxx which just happens to not require any sensors in the exhaust.

Does anybody know if this would let me avoid having to purchase another EGR sensor? I looked at the H&S site and it says:

Step 1:
Unplug all exhaust sensors. Do Not remove sensors from exhaust pipe, only unplug electrical connector.

Step 2:
Disconnect rubber pressure tubes where they attach to the pressure sensor.


This makes me think that I would still need the pressor sensor, just not the other sensors. I plan on calling H&S tomorrow, but thought one of you guys might know.
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  #4  
Old 08-22-2010, 12:56 PM
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I would start there for your loss of VREF.

Does the truck still have warranty?
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