I've been chasing all kinds of electrical gremlins lately.
First was the wiring to the rail pressure sensor.
Then the wiring to the MPROP.
And now I have this problem...

Driving to work this morning, started up and drove great.
Slowed down as I pulled up to the gate and the engine started stumbling like it wanted to die.
It never did die, and I drove on through.
Same thing happened saturday afternoon and was very intermittent.

When I pulled into the parking lot this morning, I checked for codes. P0652 was the only code.

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U.S. Army Retired

Isn't that code for an injector? Sorry I can't be much help, I'm in a tractor and don't have access to the fsm.

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2005 Crd Silver Limited- arps, rockers, 7v etechno's, egr deleted, v6 airbox, metal cac's. Yeti's stage 2 tune. Euro TC, Ram tcm, pml transmission pan, facet lift pump

P0652 is sensor reference voltage low.
Does not specify which sensor.
According to the book it could be:
INTERMITTENT DTC
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
CRANKSHAFT POSITION SENSOR
BOOST PRESSURE SENSOR
FUEL PRESSURE SENSOR
ENGINE CONTROL MODULE

But given that it runs great when cold and doesn't start acting up until engine gets hot, I'm leaning toward the crankshaft sensor.

I have a spare MAP and spare rail pressure sensor. So I could try swapping those out to see what happens.

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U.S. Army Retired

As much trouble as you've had lately, I'd be on the lookout for a cheap ECM just in case. Maybe someone has one they'd sell you?

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete

When leaving work, it was spittin and sputterin pretty bad. And this was with a cold engine so I guess that rules out the crank sensor.

While it was doing this, my fuel rail pressure gauge was acting very erratic. So I stopped and unplugged the rail pressure sensor. That smoothed out the engine and made it drivable again, but in limp mode with limited power.
So I guess I will start by swapping the rail pressure sensor.

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U.S. Army Retired

Dang, this sucks... I wonder why you have all those electric gremlins, but I wonder, isn't it easier to just replace the cps? And also, I heard of some cases where bcm connectors are corroded, I think it won't be a big deal looking into that also. Sorry, I one have no better advice...

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

With all the random issue you've been having, I'm wondering if there is a bad ground for the ECM.

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2005 Liberty CRD Limited
DIY Garage Remanufactured Engine with GDE Full Torque Eco Tune from mile zero.
ARP Studs
Cummins Lift Pump
Transgo HD2 Reprogramming Kit
DIY Rebuilt Tranny Pump
Suncoast Torque Converter
2nd Generation Fuel Head
Sears P1 Battery
Hot Diesel Solutions Thermostat

This morning before driving to work I swapped out the fuel rail pressure sensor.
Drove to work and the engine ran great. Lets hope it stays that way.

There was just one issue though.
Right before pulling into the gate, the boost hose popped off the intake elbow.
I guess I need to stop going to work

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U.S. Army Retired

Come live in illinois. We promote not working and living off other taxpayers

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2005 Crd Silver Limited- arps, rockers, 7v etechno's, egr deleted, v6 airbox, metal cac's. Yeti's stage 2 tune. Euro TC, Ram tcm, pml transmission pan, facet lift pump

Obamanomics

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2020 Ram 1500 CC Ecodiesel Limited
1995 Dodge Ram 2500 4x4, 5.9 Cummins, 47RH, Reg Cab
2005 Liberty CRD,fixed the rockers and a couple more things,GDE Hot tune,Weeks Stage 1 and 2 EGR delete,Hot Diesel solutions Tstat assembly(wonderful heat!), ARP studs, OME 1.5" lift.....thanks Seth! (Sold)
2006 Liberty CRD....The Moose Hit