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Ck engine lite on.p0128? - 2001 BMW 325

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Coolant thermostat (temperature below thermostat regulating temperatur)

Posted on Mar 25, 2011

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What does error code p0128 mean

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

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Feb 04, 2015 | Cars & Trucks

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2000 galant just turns over, no spark, getting gas, computors been replaced some time ago

the sensors will set dtc and turn on ck engine,if no spark ck ignition fuse if good ck ignition control then ecm

Aug 01, 2012 | Cars & Trucks

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Ck engine lt on. p0128?

p0128 is coolant tempurature below thermostat regulating tempurature, the most likely problem is to replace thermostat. also be sure coolant is at proper level. if still problems, replace coolant tempurature sensor.

Mar 25, 2011 | 2003 Chevrolet TrailBlazer

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Ck engine light come on had it ck show code 128

P0128 is a temperature error code indicating: ECT Sensor Below Thermostat Regulating Temperature

Possible causes are:

  1. Check the operation of the thermostat (it may be stuck open)
  2. Coolant level is too low, or the coolant mixture is incorrect
  3. ECT sensor signal circuit has a high resistance condition
  4. ECT sensor is damaged or it has failed
In most cases, assuming the coolant level is full, changing the thermostat will correct your problem.
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Mar 24, 2011 | 2005 Chevrolet TrailBlazer

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I have a 05 chevy trailblazer, the check engine lite is on and a hand held analyzer indicated problem codes: PO410 $ PO128 any ideas? Wayne C


Secondary Air Injection System fault
The air injection system is monitored for faults
Probable Causes
1) Circuit relay defective or fuse open
2) Check connector and wiring
3) AIR pump defective or hoses blocked

Fault Code Definition
  • Engine temperature has not increased and/or reached the correct level within a specified amount of time after engine startup
Common Problems That Trigger the P0128 Code
As for the po128 I would replace the thermostat first. That is the problem 99% of the time.

Good Luck

Jul 12, 2010 | Chevrolet Chevy Cars & Trucks

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