Service Engine Soon P0128

WRichieX · 10-09-2013, 04:39 PM

Hey guys, Just got a check engine light and pulled the code P0128. Coolant Temperature Below Thermostat Regulating Temperature. Can anyone tell me what that means or what needs to be fixed? Thanks.

BKV122 · 10-09-2013, 06:51 PM

Could mean your thermostat and/or water pump may be on its way out. Id change both if it continues and get it done soon since when it fails you'll be stuck

Three_thirty_I · 10-11-2013, 06:43 AM

Ah, very curious about this! What temperature range is she running at when warmed up? Thermostat is most likely jammed open...

My 330i is apparently running cooler than it should in most cases but as typically goes with my car, no error codes to suggest anything is wrong. When I activate the hidden menu on the cluster and then coolant temperature it shows it in the 79 to 84 degrees Celsius range which is apparently the high output mode for the N52 - under normal driving conditions it should be closer to 105 degrees Celsius which is Eco mode. Now the N54/55 probably has a different temperature range characteristic, but would be curious to know what temperatures you are seeing...

Efthreeoh · 10-11-2013, 07:24 PM

If you ran a BMW scan tool it probably would bring up the code that says the T-stat heater circut has failed. You need a new T-stat.

WRichieX · 10-15-2013, 03:24 PM

Ok I'm a little confused. Took the car to the dealer. They said they pulled a t-stat code. But also is saying that the car is drawing power from somewhere but don't know where. Also saying that the drawing of power may be the reason that it's causing that code as well. Now they need to check each module and test, etc to find out where it's drawing power from and will be another 4 hours @ $150/hr. Does this sound right? Can someone chime in here and let me know if this is legit? If it's a t-stat, don't they just need to change that out? Or maybe it's a battery issue then just change that out? I feel like they are trying to take me for a ride.

Three_thirty_I · 10-16-2013, 10:06 AM

Quote:

Originally Posted by WRichieX

Ok I'm a little confused. Took the car to the dealer. They said they pulled a t-stat code. But also is saying that the car is drawing power from somewhere but don't know where. Also saying that the drawing of power may be the reason that it's causing that code as well. Now they need to check each module and test, etc to find out where it's drawing power from and will be another 4 hours @ $150/hr. Does this sound right? Can someone chime in here and let me know if this is legit? If it's a t-stat, don't they just need to change that out? Or maybe it's a battery issue then just change that out? I feel like they are trying to take me for a ride.

Sorry, missed this when you posted - what did they find? I doubt it's a battery issue, mine was virtually dead a few weeks back and no errors or issues like this.

Keep us posted!

nate5ks · 10-16-2013, 05:52 PM

T-stat stuck open. I had this and changing the t-stat fixed the problem.

GoRomeo · 10-16-2013, 05:57 PM

Me too. Is your T-stuck open. I had this error code last year. NOthing major. I just cleared the error with a OBD tool.

Ill change Thermostat along with my WP as soon as I can save some cash..

10-09-2013, 04:39 PM	#1
WRichieX Major 79 Rep 1,076 Posts Drives: 07 335i e93 6MT Join Date: May 2013 Location: Chicago iTrader: (0) Garage List 2007 BMW 335i E93 [0.00]	Service Engine Soon P0128 Hey guys, Just got a check engine light and pulled the code P0128. Coolant Temperature Below Thermostat Regulating Temperature. Can anyone tell me what that means or what needs to be fixed? Thanks. __________________ 07 BMW 335i E93 6MT (Praying neighborhood doesn't get flooded...again) 04 Infiniti G35 Coupe 6MT (Flooded) 08 Audi TT 2.0T DSG (Flooded) 03 Subaru WRX 5MT (Flooded)
	Appreciate 0 Tweet Quote

10-09-2013, 06:51 PM	#2
BKV122 Major 47 Rep 1,160 Posts Drives: E90 Join Date: Feb 2009 Location: NY iTrader: (1) Garage List 2006 330xi [9.50]	Could mean your thermostat and/or water pump may be on its way out. Id change both if it continues and get it done soon since when it fails you'll be stuck __________________ Monaco Blue 330xi - Terra Interior/6-MT/Sport/Premium/Cold/CSL's/M3 Spoiler Lip/Black Kidney's
	Appreciate 0 Quote

10-11-2013, 06:43 AM	#3
Three_thirty_I Lieutenant Colonel 200 Rep 1,834 Posts Drives: '05 E90 330i Manual Join Date: Aug 2010 Location: Cape Town, South Africa iTrader: (0) Garage List 2005 BMW E90 330i [0.00]	Ah, very curious about this! What temperature range is she running at when warmed up? Thermostat is most likely jammed open... My 330i is apparently running cooler than it should in most cases but as typically goes with my car, no error codes to suggest anything is wrong. When I activate the hidden menu on the cluster and then coolant temperature it shows it in the 79 to 84 degrees Celsius range which is apparently the high output mode for the N52 - under normal driving conditions it should be closer to 105 degrees Celsius which is Eco mode. Now the N54/55 probably has a different temperature range characteristic, but would be curious to know what temperatures you are seeing... __________________ BMW E90 330i (M) '05 (His) \| (Hers) BMW E46 320i f/l (M) '03
	Appreciate 0 Quote

10-11-2013, 07:24 PM	#4
Efthreeoh General 17294 Rep 18,726 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	If you ran a BMW scan tool it probably would bring up the code that says the T-stat heater circut has failed. You need a new T-stat.
	Appreciate 0 Quote

10-15-2013, 03:24 PM	#5
WRichieX Major 79 Rep 1,076 Posts Drives: 07 335i e93 6MT Join Date: May 2013 Location: Chicago iTrader: (0) Garage List 2007 BMW 335i E93 [0.00]	Ok I'm a little confused. Took the car to the dealer. They said they pulled a t-stat code. But also is saying that the car is drawing power from somewhere but don't know where. Also saying that the drawing of power may be the reason that it's causing that code as well. Now they need to check each module and test, etc to find out where it's drawing power from and will be another 4 hours @ $150/hr. Does this sound right? Can someone chime in here and let me know if this is legit? If it's a t-stat, don't they just need to change that out? Or maybe it's a battery issue then just change that out? I feel like they are trying to take me for a ride. __________________ 07 BMW 335i E93 6MT (Praying neighborhood doesn't get flooded...again) 04 Infiniti G35 Coupe 6MT (Flooded) 08 Audi TT 2.0T DSG (Flooded) 03 Subaru WRX 5MT (Flooded)
	Appreciate 0 Quote

10-16-2013, 05:52 PM	#7
nate5ks Captain 33 Rep 648 Posts Drives: 2006 BMW 330xi Join Date: Nov 2011 Location: Jacksonville Beach, FL iTrader: (0)	T-stat stuck open. I had this and changing the t-stat fixed the problem.
	Appreciate 0 Quote

10-16-2013, 05:57 PM	#8
GoRomeo Brigadier General 962 Rep 3,848 Posts Drives: 330i, 135i Join Date: Feb 2006 Location: San Diego CA iTrader: (0) Garage List 2008 BMW 135i [9.50] 2006 330i [6.75]	Me too. Is your T-stuck open. I had this error code last year. NOthing major. I just cleared the error with a OBD tool. Ill change Thermostat along with my WP as soon as I can save some cash..
	Appreciate 0 Quote