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Generic problem for all BMW 5 Series Cars

BMW 325ci - Car cuts off on very hot day...




By kenrickj on Aug 18, 2009

" "
I have a 2004 BMW 325CI and lately on very hot days above 90 degrees farenheit car hesitates then shuts off while driving at 60 miles per hr. or above. The car does not overheat. The thermostat was replaced once already and the mass flow unit cleaned. I keep getting an error code P00128. Can anyone help solve the problem?
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Solution #1

posted on Aug 18, 2009
Somewhat Helpful)

centralvalle
centralvalle

Rank: Guru 
Rating: 88%, 204 votes
Check the following :

BMW Code PO128
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125
In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant

temperature (ECT) sensor reading, and the speed of the vehicle.

You will likely not notice any drivability problems other than the MIL illumination.
A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
solutions
Past experience indicates that the most likely solution is to replace the thermostat. Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat

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This Problem Also Relates To: 1996 BMW 318 2001 BMW 5 Series 1994 BMW 3 Series 1997 BMW 318 1997 BMW 328 1999 BMW 328 Series 2001 BMW 330

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