PO514 Code - Dodge Diesel

Tony T. · 12-28-2007, 04:22 PM

I check for codes periodically and usually do not find any. I just checked today since it's been awhile and found it showing PO514, which means (BAT Temperture Sensor Rationality). What actually does this mean, I'm curious because these are the original batteries and they are now 5 years old.Also will this code that's showing go away on it's own or does it have to be removed.

Tony

Spooler · 12-28-2007, 10:58 PM

I heard of that code from the guys in the north. They say it comes and goes every winter. Dosen't really cause a problem. I know for the newer trucks (06'-up) there is a flash that addresses this issue.

RonP · 12-29-2007, 01:56 AM

If it hasn't set the CEL light, don't worry about it. Heck even if it has, don't worry about it. I have been getting this a few times every winter since I owned mine. I just drive it and it goes away. Seems to happen more often when I use the block heater. Check it again in a few days or a week and it will probably be gone. You can have autozone or someone clear it if it bothers you and you don't have a means to clear it yourself.

Tony T. · 12-29-2007, 06:25 AM

Thanks guys for the replies.

Tony

CTD23 · 12-29-2007, 08:32 AM

usually means 1 of 2 things...comes on because of short trips taken with your truck...when it starts to get cold u take a short trip it warms up, then quickly cools..if you make multiple short trips, it sees up and down voltages setting the code or if it keeps coming on your sensor is junk

rjm022 · 12-29-2007, 08:44 AM

my truck has had that code from day one. it doesn't cause any problems.

Stew130 · 12-30-2007, 09:11 AM

same here. i still get it every now and then during winter but it hasn't effected anything yet

vzdude · 12-30-2007, 09:16 AM

The rationality code comes on in the winter when you have the block heater plugged in .That causes the coolant temp reading at start up to be higher than the intake air temp reading. The computer recognizes that as an issue with one of the sensors. There is a reflash to update the computer with new information that will eliminate that code, along with some other small issues too.

Tony T. · 12-30-2007, 10:09 AM

Quote:

Originally Posted by vzdude

The rationality code comes on in the winter when you have the block heater plugged in .That causes the coolant temp reading at start up to be higher than the intake air temp reading. The computer recognizes that as an issue with one of the sensors. There is a reflash to update the computer with new information that will eliminate that code, along with some other small issues too.

Are you meaning the word "rationality" as the word that's used in some other code definitions, because I've seen it (that word) used on some other "P" code definitons also and really didn't understand the meaning they wanted to convey, or is it just this specfic code P0514 that is related to plugging in the block heater, because I have not used my block heater at all so far this year. Anyway this is the first time I've ever noticed this code since I purchased the truck new.

Definition:
ra·tion·al·i·ty (rsh-nl-t)
n. pl. ra·tion·al·i·ties
1. The quality or condition of being rational.
2. A rational belief or practice.
3. rationality - the quality of being consistent with or based on logic.

Tony

MikeyB · 12-30-2007, 01:09 PM

I get that code every winter after driving for a period of time (like for several hours) when the temperature is 55 degrees or less. I just ignore it.

MikeyB

vzdude · 12-30-2007, 02:11 PM

The term "rationality", used in the description of codes, is there to describe the reasoning behind the code. Like in your case, the ECM compares the reading of the coolant temperature sensor to the reading of the air intake sensor and the ambient air temperature sensor to make sure that they are all close in readings. If they are not, the computer sets this code to tell the technician to look at all of the related sensors and wiring to find the cause. It isn't saying that one or the other is necesarily bad, pre say, but that they aren't matching for an undetermined reason. They are all within specs, just not matching, so it doesn't know which one to set a code for. The reflash basically tells the computer to either disregard the coolant temp reading in temperatures below a certain temp, or not to look at at all and just compare the other sensors instead. Can't say for sure, but they did change the programming to eliminate this code in cold weather when the block heater is used.

Tony T. · 12-30-2007, 05:46 PM

Quote:

Originally Posted by vzdude

The term "rationality", used in the description of codes, is there to describe the reasoning behind the code. Like in your case, the ECM compares the reading of the coolant temperature sensor to the reading of the air intake sensor and the ambient air temperature sensor to make sure that they are all close in readings. If they are not, the computer sets this code to tell the technician to look at all of the related sensors and wiring to find the cause. It isn't saying that one or the other is necesarily bad, pre say, but that they aren't matching for an undetermined reason. They are all within specs, just not matching, so it doesn't know which one to set a code for. The reflash basically tells the computer to either disregard the coolant temp reading in temperatures below a certain temp, or not to look at at all and just compare the other sensors instead. Can't say for sure, but they did change the programming to eliminate this code in cold weather when the block heater is used.

Thanks vzdude for the explanation, I'm really trying to avoid any sort of reflash that I can, truck runs great now as it is and I want to keep it that way. I can live with the code and as stated from above it will probably fade away.

Tony

Hvytrkmech · 12-30-2007, 06:23 PM

The ecm takes readings from the coolant, oil, air, and ambient temp sensors on ignition cycle to help decide how to map everything to start your truck, the P0514 usually initiates from a block heater being plugged (but not always) in and the ecm seeing vastly different temps between the associated sensors.

This is just an addition to Vzdude's expaination. The accumulative reflash for this may resolve some underlying issues, however if you are not having any driveability concerns with you truck, then you don't need to worry about it, keep on truckin.

Tim

12-28-2007, 10:58 PM	#2
Spooler Registered User Join Date: Jan 2006 Location: Claxton, GA Posts: 5,301 My Photo Gallery My Classified Ads	I heard of that code from the guys in the north. They say it comes and goes every winter. Dosen't really cause a problem. I know for the newer trucks (06'-up) there is a flash that addresses this issue. __________________ 2004.5 Dodge 3500 Dually 4x2 Quadcab, 325/600, 4.10 gears with LS, 48RE, Banks Monster Exhaust, Banks High Ram Intake, ISSPRO Gauges, Fuel Pressure, EGT, Boost, Trans Temp, 3 gauge Pillar mount, single steering colum mount, AFE Stage 1 with PGM7, Amsoil w bypass, Timbrens, Brakesmart,Bilsteins, kinda stock

12-29-2007, 01:56 AM	#3
RonP Registered User Join Date: Sep 2004 Location: Winston Salem, NC Posts: 706 My Photo Gallery My Classified Ads	If it hasn't set the CEL light, don't worry about it. Heck even if it has, don't worry about it. I have been getting this a few times every winter since I owned mine. I just drive it and it goes away. Seems to happen more often when I use the block heater. Check it again in a few days or a week and it will probably be gone. You can have autozone or someone clear it if it bothers you and you don't have a means to clear it yourself. __________________ CWO4 US Marine Corps 04 3500 SRW 4X4 305/555 Goerend 48RE w/Billet input, Billet Flex plate, Triple disk, 4.10 Offroad package, Rhino Spray-in liner, Access roll-up cover, Step Bars, Billet Grille, Monster exhaust w/Aero 4040, Ultra-lite gauges, Smarty, MP-8, Glacier fuel system, Bilstein 5100's, Firestone air bags, 2 micron filtering, S&B intake, GDP intake horn, HE351. SAC #260 73 Duster street driven 493 ci, 6.0's in the 1/8th 9.62 1/4 so far.

12-29-2007, 08:32 AM	#5
CTD23 Registered User Join Date: Feb 2006 Posts: 23 My Photo Gallery My Classified Ads	usually means 1 of 2 things...comes on because of short trips taken with your truck...when it starts to get cold u take a short trip it warms up, then quickly cools..if you make multiple short trips, it sees up and down voltages setting the code or if it keeps coming on your sensor is junk __________________ 04 2500 CTD QC SLT 6 Spd Black Cloud 6" Aussie's, AFE , Edge juice w/attitude stacked w.VA 3.1, FASS 150 91 Hero Chopped, Caged, Solid axle 60's front/Rear, Full Chromoly, Fox 2.0's, 302, atlas 4.3, hasnt moved in 3 years

12-29-2007, 08:44 AM	#6
rjm022 Registered User Join Date: Mar 2004 Location: wilson,ny Posts: 1,729 My Photo Gallery My Classified Ads	my truck has had that code from day one. it doesn't cause any problems. __________________ 2004.5 dodge ram 4x4.auto.315/70/17 destination a/t's. fender flares.line of fire.clear cab lights.s&b air intake. dt pro fab control arms.autometer ultra-lite fuel/oil pressure gauges.dual isspro tranny gauges.line-x.fass 95gph.bilstein shocks.donaldson muffler.edge juice/attitude.amsoil bmk-11 single bypass.custom made prerunner front bumper with 12,000lb winch. back up lights.cool down timer.mag-hytec dd tranny pan.dyna-trac lock out hubs.thuren track bar.dss steering stabilizer. h2 rims.

12-30-2007, 09:11 AM	#7
Stew130 Registered User Join Date: Feb 2004 Location: in a house... Posts: 95 My Photo Gallery My Classified Ads	same here. i still get it every now and then during winter but it hasn't effected anything yet __________________ 2004.5 2500 SLT QC 4X4, Auto Trans (yeah I know), 3.73 rear, Graphite Metallic, Trailer and Protection Groups, Anti-slip diff, Electronic Shift-on-the-Fly, Westin Platnum Series nerf bars, Rhino lining, Sirius Plug and Play, BFG All-Terrain T/A 305/65-17E, M/T classic lock 17X9, Taurus PT-111 9mm security system, Valentine 1 V1.8 detector software ver.3.872, Garmin Nuvi w/Trapster

12-29-2007, 06:25 AM	#4
Tony T. Registered User Join Date: Mar 2004 Location: North Texas Posts: 261 My Photo Gallery My Classified Ads	Thanks guys for the replies. Tony

12-30-2007, 09:16 AM	#8
vzdude DTR's 'Go to Guy' Join Date: Jan 2007 Location: Indiana Posts: 3,800 My Photo Gallery My Classified Ads	The rationality code comes on in the winter when you have the block heater plugged in .That causes the coolant temp reading at start up to be higher than the intake air temp reading. The computer recognizes that as an issue with one of the sensors. There is a reflash to update the computer with new information that will eliminate that code, along with some other small issues too. __________________ 2003 2500 4x4 48RE 3.73 Gear - Silencer laying on tool box!, K&N Drop In Air filter, XzillaraiderII Beta Race and Quad Commander, Autometer Phantom oil pressure guage. Nitto 285 Dura Grapplers , Bilstien 5100 shocks, Walbro Lift Pump, Custom 2 micron Fuel Filter VW is gone! Back to driving to Dodge full time! I'll try to be nice, as long as YOU try to be smart! Support DTR by shopping the online store! DTR members get the best pricing - - 304-952-6896 Link to DTR Store

12-30-2007, 01:09 PM	#10
MikeyB Registered User Join Date: Oct 2002 Location: Tomball, Texas Posts: 7,151 My Photo Gallery My Classified Ads	I get that code every winter after driving for a period of time (like for several hours) when the temperature is 55 degrees or less. I just ignore it. MikeyB __________________ 2003 2500 2wd SWB Quad Cab Laramie, 305/555, NV5600, 3.73LS, Line-X, Westach boost/EGT combo gauge, PML diff cover, Airbox mod, Hurst 6spd Shift ****, Adjustable boost elbow, Toyo OC AT 285/70/17 E, Daystar 1.5" lift, Monroe Reflex, Raptor RP100, Lazarsmith Intake Horn, HID SMARTY Sr./Van Aaken C3.2

12-30-2007, 02:11 PM	#11
vzdude DTR's 'Go to Guy' Join Date: Jan 2007 Location: Indiana Posts: 3,800 My Photo Gallery My Classified Ads	The term "rationality", used in the description of codes, is there to describe the reasoning behind the code. Like in your case, the ECM compares the reading of the coolant temperature sensor to the reading of the air intake sensor and the ambient air temperature sensor to make sure that they are all close in readings. If they are not, the computer sets this code to tell the technician to look at all of the related sensors and wiring to find the cause. It isn't saying that one or the other is necesarily bad, pre say, but that they aren't matching for an undetermined reason. They are all within specs, just not matching, so it doesn't know which one to set a code for. The reflash basically tells the computer to either disregard the coolant temp reading in temperatures below a certain temp, or not to look at at all and just compare the other sensors instead. Can't say for sure, but they did change the programming to eliminate this code in cold weather when the block heater is used.

12-30-2007, 06:23 PM	#13
Hvytrkmech Administrator ........ DTR's puttin fires out and workin on big trucks admin Join Date: May 2006 Posts: 1,847 My Photo Gallery My Classified Ads	The ecm takes readings from the coolant, oil, air, and ambient temp sensors on ignition cycle to help decide how to map everything to start your truck, the P0514 usually initiates from a block heater being plugged (but not always) in and the ecm seeing vastly different temps between the associated sensors. This is just an addition to Vzdude's expaination. The accumulative reflash for this may resolve some underlying issues, however if you are not having any driveability concerns with you truck, then you don't need to worry about it, keep on truckin. Tim __________________ 2006, 3500 QC/SRW/LB/48RE/4.10/Inferno red, Mag-Hytec trans and diff cover, Isspro gauges, Quad XZTII, GDP 2 micron kit, Air Dog 100 It's my job to save your butt, not kiss it.

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