P0128 Coolant Thermostat Malfunction - Bimmerfest - BMW Forums

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Old 09-09-2012, 01:34 PM
Lunchbox21984 Lunchbox21984 is offline
Location: Texas
Join Date: May 2012
Posts: 5
Mein Auto: 2005 X5 3.0i
P0128 Coolant Thermostat Malfunction

Hello everyone, im a newbie on here posting, but have been browsing the forum for sometime now.

Wifes truck just through up this P0128 Coolant Thermostat Malfunction code and was wanting too get some input on it.

2005 X5 3.0i with 96k on it. runs fine and doesnt run hot, runs in the middle of the temp gauge and never moves past the middle. has plenty of coolant and has been kept up.

let me know what you guys come up with as far as info i need or whatnots.

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Old 09-10-2012, 07:14 AM
Scott ZHP's Avatar
Scott ZHP Scott ZHP is offline
We want the Lion!
Location: PA, USA
Join Date: Jul 2003
Posts: 7,769
Mein Auto: 03 ZHP, 01 X5, 73 MGB
If this were mine, I'd replace the thermostat, the water pump and the expansion tank. Unless you know these have been replaced recently.

Originally Posted by Fast Bob View Post
JUST...LOOK...UNDER...THE...CAR....for Chrissakes....it`s like checking to see if a dog is male or female....
Originally Posted by smolck View Post
A bimmer with forced induction should have a proper manual gearbox. Anything less is like french kissing your sister.
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Old 09-10-2012, 01:40 PM
tmvE39/E53/Z32's Avatar
tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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Location: Seattle --> Atlanta
Join Date: Dec 2010
Posts: 2,033
Mein Auto: Dinan //M5, Dinan 4.8iS,
Does it take a little while for the temp needle to raise to operating temp? Did your temp needle move to the left (11 o'clock position) when you're on a hway? If so, you have a fail-opened thermostat.

2000 Dinan S1 //M5 (my DD), 06 DINAN E53 4.8iS (wife's DD), 90 Straman Z32TT (my pride & joy ride)
Gone, but not forgotten: 01 E53 3.0i, 01 525i Sport, 03 DINAN 540i MSport, 01 //M5 and 91 Z32TT
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