Question about Chevrolet S 10

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I am having the same problem with my 2002 525I. Its in the shop as we speak and the two codes are 500-speed sensor and the 128-Thermostat coolant temp. I was informed that the ABS Module has to be replaced and could range from 1,000. to 3,000. new or refurbished. i dont know what to do.

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Have them explain why these parts are defective and if they are replaced will they warranty the work will fix the problems. Also get the exact work that is to be performed and go to a site called and check the cost in the labor guide to see if they are giving you a good deal.

Posted on Feb 14, 2012


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Engine Code: 128-545-137

128-coolant thermostat,137 bank 1 sensor 2 after catalytic conv.exhaust gas temp.sensor 545 bank 1 sensor 1.

Feb 02, 2016 | Cars & Trucks

2 Answers

P0128 came back after replacing t-stat

code p 128 refers to coolant thermostat---coolant temp below thermostat regulating temperature ====causes --mechanical fault
you say that you have replaced the thermostat and it is just under 210 F which is 99 c or almost boiling point
you will have to investigate why it is running so hot.
check that you put the thermostat in correctly ( bulb section to block/head water
Next point --the codes are originated by the coolant temperature sensor ( puts the fans on and sets the ECM fuel/air ratio for the engine ) so to get it off you will need to reset with a scan tool

Dec 24, 2015 | 2005 Chevrolet TrailBlazer

1 Answer

I have 4 codes that came up on my 2005Chevy impala, PO 128,PO336,PO38,and PO 386can anyone tell what these are?

P0038 - HO2S Heater Control Circuit High Bank 1 Sensor 2
P0128 - Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
P0336 - Crankshaft Position Sensor Circuit A Range/Performance
P0386 - CKP Sensor B Circuit Performance.
your most likely need to replace the crankshaft sensor and probably will take care of the 0336 and 0338 codes.
you then need to check your coolant level, if low fill and look for leaks, if not low, most likely replacing the thermostat will correct other two codes

Oct 17, 2015 | Cars & Trucks

1 Answer

Whats code ecu 128

We are assuming that you are talking about P0128 code.

P0128 OBD-II - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

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.

Contact us if need additional details.

Oct 12, 2011 | Cars & Trucks

1 Answer

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.
Thank you for using Fixya!

Mar 24, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

My 2003 kia spectra comes up with P116 and P128 error messages. What do I need

p0116 is-- engine coolant tempurature ckt/range performance----- p0 128 is--coolant temp below thermostat regulating temperature. to fix these 2 codes are similar, change coolant tempurature sensor and thermotat all should be ok. make sure coolant in radiater is full. hope this helps you.

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

Feb 07, 2011 | 2003 Kia Spectra

1 Answer

I have a 2005 GMC ENVOY with a sensor reading of 0128 and they said it was my sensor bad. But now i am loosing power going up hill. Does this mean i have another problem? If so what could it be?

PO-128 Coolant Thermostat, Temp Below Regulating Temperature

Leaking or stuck open thermostat
Coolant temp sensor
Cylinder head temp sensor
Engine coolant level

You could have more than one issue

The only way to answer your questions,is to put a scanner on your vehicle,and see what codes you have.
The codes you get,do not indicate a failure,necessarily
You have to follow a diagnostic process,to find any problems.
If you have been going to auto parts stores,to have codes read,and have no knowledge or intension of doing your own work,you need to find a good repair shop, and just have it repaired,fairly soon

May 25, 2010 | 2005 GMC Envoy

1 Answer


P0128: 'Coolant Thermostat (Coolant Temperature below Thermostat Regulation Temperature)'
P0334: 'Crankshaft Position Sensor Circuit, Electrical fault'
P0002: ??
P0100: 'Mass Air Flow Circuit, Range/Performance'

The Mass air flow sensor creates all the other problems. This is a very common problem with S60 this old.

Dec 28, 2009 | 2002 Volvo S60

2 Answers

Error code p0128 on Dodge Magnum 2006 and P1004

It is very likely your thermostat is stuck open. Replace the thermostat and it should be fine.

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Oct 03, 2009 | 2006 Dodge Magnum

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