Anybody here thrown a false 2EF4 (thermostat code)?

tc535i · 10-13-2014, 10:33 AM

From service records, the dealer replaced my "main electrical coolant pump" (water pump?) at 51k but I don't see any note about thermostat.

Yesterday my car threw a CEL but no code thru idrive. Pulled it via my JB4 and got 2EF4, failed thermostat. Does this mean it's time to pull the water pump off again? You think they really just threw a new pump on there with the old thermostat?

Times like this, I really wish I had a coolant gauge to keep an eye on... ugh

2jzn54 · 10-13-2014, 10:52 AM

Do you have a tune? You can log engine water temp. Funny you mention this I got a 2EF7 yesterday by itself a few times yesterday when WOT at around 120. related to the thermostat, but code doesn't deem it a failure.. have yet to search around, but I'd start with checking your coolant resevoir and see if its lower than normal.. and cehck for any leaks under your car. The pumps on these things are electrical and can go whenever they damn please its annoying and I think the coolant leaks generally seep into the electrical components causing them to short :/

GreaseJunkie · 10-13-2014, 11:02 AM

Yep. Been there since the day I bought it. Along with a code for a short circuit in the active grille shutters that I don't have.

I know my thermostat is working, and from my understanding, if they fail, they stick open. But just to play it safe I have a brand new Stat along with 3 extra coils in my emergency kit.

tc535i · 10-13-2014, 11:05 AM

Quote:

Originally Posted by Daily Three

Do you have a tune? You can log engine water temp. Funny you mention this I got a 2EF7 yesterday by itself a few times yesterday when WOT at around 120. related to the thermostat, but code doesn't deem it a failure.. have yet to search around, but I'd start with checking your coolant resevoir and see if its lower than normal.. and cehck for any leaks under your car. The pumps on these things are electrical and can go whenever they damn please its annoying and I think the coolant leaks generally seep into the electrical components causing them to short :/

Good idea, didn't even think about that. I'll try logging my ride into work tomorrow and see how long it takes to hit operating temp. Should tell me if it's working or not.

Any way to clear the codes and see if it shows back up, with only a JB4?

tc535i · 10-13-2014, 11:06 AM

Quote:

Originally Posted by GreaseJunkie

Yep. Been there since the day I bought it. Along with a code for a short circuit in the active grille shutters that I don't have.

I know my thermostat is working, and from my understanding, if they fail, they stick open. But just to play it safe I have a brand new Stat along with 3 extra coils in my emergency kit.

Hmm... odd. I have 2 codes, the other being an unplugged exhaust flap. This one's actually triggering the CEL tho, I thought it was my DPs finally showing up but I guess they still haven't triggered anything (5-6 months now)

2jzn54 · 10-13-2014, 11:17 AM

Quote:

Originally Posted by tc535i

Good idea, didn't even think about that. I'll try logging my ride into work tomorrow and see how long it takes to hit operating temp. Should tell me if it's working or not.

Any way to clear the codes and see if it shows back up, with only a JB4?

Of course. You can select menu 1 option 2 and it will delete the code. Thats what I did yesterday or I wouldn't have been able to replicate the issue at 120 lol.

GreaseJunkie · 10-13-2014, 12:13 PM

Yeah, I'm still not sure how much I trust our MILs. Mine didn't even come on after I miffed up my ESS changing the valve cover gasket. Drove it for over 40 miles, never once lit up, just had a hard time staying running on a cold start.

tc535i · 10-13-2014, 02:37 PM

Quote:

Originally Posted by Daily Three

Of course. You can select menu 1 option 2 and it will delete the code. Thats what I did yesterday or I wouldn't have been able to replicate the issue at 120 lol.

thanks, cleared the code before heading home for lunch, hasn't come back yet but to be fair I won't start the car from dead cold until tomorrow morning. Will update if it comes back, here's hoping we don't hear from me again

tc535i · 11-04-2014, 12:57 PM

3 weeks, still nothing

guess it was just a glitch?

tc535i · 11-24-2014, 03:19 PM

threw it again today, along with 2F64 :/

pogal · 11-25-2014, 05:17 PM

Here is what I am doing with my 2007 335i

works like a charm

10-13-2014, 10:33 AM	#1
tc535i Lieutenant Colonel 217 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	Anybody here thrown a false 2EF4 (thermostat code)? From service records, the dealer replaced my "main electrical coolant pump" (water pump?) at 51k but I don't see any note about thermostat. Yesterday my car threw a CEL but no code thru idrive. Pulled it via my JB4 and got 2EF4, failed thermostat. Does this mean it's time to pull the water pump off again? You think they really just threw a new pump on there with the old thermostat? Times like this, I really wish I had a coolant gauge to keep an eye on... ugh
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10-13-2014, 10:52 AM	#2
2jzn54 Captain 41 Rep 823 Posts Drives: 07 E90 335i 6MT Join Date: Jul 2011 Location: United States iTrader: (6)	Do you have a tune? You can log engine water temp. Funny you mention this I got a 2EF7 yesterday by itself a few times yesterday when WOT at around 120. related to the thermostat, but code doesn't deem it a failure.. have yet to search around, but I'd start with checking your coolant resevoir and see if its lower than normal.. and cehck for any leaks under your car. The pumps on these things are electrical and can go whenever they damn please its annoying and I think the coolant leaks generally seep into the electrical components causing them to short :/
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10-13-2014, 11:02 AM	#3
GreaseJunkie First Lieutenant 17 Rep 328 Posts Drives: 2006 E90 330i Black Sapphire Join Date: Apr 2014 Location: Virginia iTrader: (0)	Yep. Been there since the day I bought it. Along with a code for a short circuit in the active grille shutters that I don't have. I know my thermostat is working, and from my understanding, if they fail, they stick open. But just to play it safe I have a brand new Stat along with 3 extra coils in my emergency kit.
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10-13-2014, 12:13 PM	#7
GreaseJunkie First Lieutenant 17 Rep 328 Posts Drives: 2006 E90 330i Black Sapphire Join Date: Apr 2014 Location: Virginia iTrader: (0)	Yeah, I'm still not sure how much I trust our MILs. Mine didn't even come on after I miffed up my ESS changing the valve cover gasket. Drove it for over 40 miles, never once lit up, just had a hard time staying running on a cold start.
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11-04-2014, 12:57 PM	#9
tc535i Lieutenant Colonel 217 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	3 weeks, still nothing guess it was just a glitch?
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11-24-2014, 03:19 PM	#10
tc535i Lieutenant Colonel 217 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	threw it again today, along with 2F64 :/
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11-25-2014, 05:17 PM	#11
pogal New Member 2 Rep 9 Posts Drives: 2018 M5 Join Date: Nov 2014 Location: Ottawa iTrader: (0)	Monitor Coolant temp in our cars Here is what I am doing with my 2007 335i works like a charm
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