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Code P3081

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Old 10-13-2009, 06:31 PM   #1
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Default Code P3081

Does anyone know what code p3081 really means? I got this on for a 3 weeks already. My OBD2 reader doesn't have the code in data base. I read on the forum it's related to coolant temp sensor. 3 day ago I did TB and changed the sensor. The problem still exists. Another link - erratic coolant temp gauge. 2003 2.7T 99k miles. Any help greatly appreciated. Tanks fellas!
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Old 10-13-2009, 07:09 PM   #2
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Your symptoms point to something wrong with the sensor, is the connector on good?
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Old 10-13-2009, 07:16 PM   #3
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yes, when replacing the sensor I inspected the connector and wires. no corrosion found.
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Old 10-13-2009, 07:27 PM   #4
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thermostat
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Old 10-13-2009, 07:30 PM   #5
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I replaced termostat together with TB 3 days ago. the problem existed way before and continue...
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Old 10-13-2009, 07:35 PM   #6
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hmm. i just had a jetta (i think! i see a lot of cars) with that same code along with another, which i cannot remember at this time, replaced cts and stat. haven't had a problem with it.

any actual drivability/other problems/symptoms?

i assume you were able to clear the code and it came back on correct?
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Old 10-13-2009, 07:42 PM   #7
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yes, cleared them multiple times and the code comes back without check engine light. the light comes on 10-15 min later. when i start the engine in the morning it should idle at higher rpm for a few min. (aprox. 1500), but when the code is active rpm stays low about 750. than I erase code with OBD2 reader and immidietly rpm goes high and engine gets louder tone.
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Old 10-13-2009, 07:46 PM   #8
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the car runs fine except the coolant gauge that almost always stays on "cold"
I performed test with OBD2 reader, check coolant temp reading graph during driving and it shows normal operating temperature.
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Old 10-14-2009, 02:47 PM   #9
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well, that is odd. i guess i would check the t-stat again, maybe get a factory part if you didn't before. Maybe also check to make sure you have the system bled completely.

good luck, let us know what you find
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Old 10-14-2009, 03:40 PM   #10
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I think the code is related to erratic temp gauge. There is nothing wrong with temperature of the engine (no overheating or being cold). To find out what is really wrong I need to find out what is code p3081 really mean and go from there. Can you guys direct me on how to find it? My reader doesn't recognize it! Thanks for all the answers.
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Old 10-18-2009, 11:41 AM   #11
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Maybe I should send my gauges for rebuild? Can a faulty water tem gauge trigger the code?
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Old 10-21-2009, 09:53 AM   #12
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This pesky code has come to me today in the form of an 04 audi A8. The car came in with the engine fan on High and the temp gauge full cold. heat from heater was good. cleared the code and everything went back to normal! fan turned down and guage read engine temp, which still read a bit low. I am in the middle of diag right now so I'll post back what I find.

The actual P3081 code means this according to VAGCOM.

"engine temp too low, implausible signal-MIL on

hope this helps
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Old 10-21-2009, 07:15 PM   #13
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I get the similar info in eBahn repair manual for 2003 A6 2.7 w/ BEL engine:

SAE VAG Description
----- ----- -----------
P3081 19537 Engine temperature too low

Note: Let engine warm up; coolant temperature must be at least 50 C (122 F), advance scan tool to Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.
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Old 10-23-2009, 06:27 PM   #14
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yeah, my temp gauge is cold all the time now. At least I know now it's related to the code. Thanks guys for the info. Now the question is: what's next....Do you have any info on troubleshooting the code? Dealer told me that this engine has 2 temperature sensors. I replaced one with TB job. Maybe I should change the other one? Thanks.
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Old 10-28-2009, 06:10 AM   #15
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the temp sensor on the rear of the engine is the problem one. is that what you replaced? its kind of a pain to get to.
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Old 11-03-2009, 05:47 PM   #16
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No, I replaced the bottom radiator sensor when doing timing belt(lots of posts were pointing to that one). Are you talking about "engine temperature sender for engine control module (G62)"? You may be right. If it is for ecm that explains the check engine light & code. I'll try to find some more info about this sender. I hate changing parts and not knowing why. Do you have more info or experience with this sender? Thanks again!
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Old 11-04-2009, 04:35 PM   #17
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Quote:
Originally Posted by janserce79 View Post
No, I replaced the bottom radiator sensor when doing timing belt(lots of posts were pointing to that one). Are you talking about "engine temperature sender for engine control module (G62)"? You may be right. If it is for ecm that explains the check engine light & code. I'll try to find some more info about this sender. I hate changing parts and not knowing why. Do you have more info or experience with this sender? Thanks again!
yes (G62) is the one. I can almost guarantee that this is your prob. I have replaced dozens of them on everything from jettas to A8's. It is the sensor that provides an input to the ecm and cluster module. it is a 4 wire connector and is usually green.It sits just below the throttle body on the back of the engine. It is kind of a pain to get at, but it will fix your prob.

HINT: When you pull out the horseshoe clip/retainer for the sensor it is a bit tricky, you'll have to shimmy it between the sensor and the block, a long screwdriver works well for this. When you re-install the clip, you can install it backwards, for much easier install.

HINT#2: When installing new sensor w/ new o-ring apply just a bit of vaseline on the o-ring so it will slide right in. make sure you get it pushed in all the way or you will have a leak.

Hope this helps!
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Old 11-04-2009, 04:38 PM   #18
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PS... I have never had a problem with the sensor on the radiator hose, never seen one fail.
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Old 11-09-2009, 05:05 PM   #19
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Thanks alot! This is the answer I was looking for. And yeah, I'm familiar with those "tricky" clips and O-rings. Tommorrow I'll tackle it and will come back with the results. Thanks alot for your help emjayem! I love this forum!!!!
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Old 11-09-2009, 05:10 PM   #20
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Aaaa one more thing I forgot! Do you know how much coolant will I loose after removing G62? I don't think it will be alot cause the sensor is pretty high...And yes I know to do it on the cold engine! :-)
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Old 11-09-2009, 05:10 PM
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04, 18, 18t, 2003, 2004, a4, a6, audi, code, fault, gti, obd, p3081, trouble, tt, vag, vw


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