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Code p0128 Chevy cavalier code - Cars & Trucks

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  • Cars & Trucks Master
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Posted on Dec 18, 2016

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SOURCE: 2005 chevy cavalier steroe is locked need code

The only way to unlock the radio is by using a scan tool. The scan tool sends the appropriate diagnostic message (relearn VIN) to reset the radio. Using a scan tool, select the radio VIN relearn procedure from the module replacement screen in Vehicle Control Systems

Posted on Nov 19, 2008

  • 43 Answers

SOURCE: P0128 code

Unless the car is overheating you probably just have a bad temperature sensor probably located on the intake manifold....

Posted on Apr 03, 2009

Testimonial: "i replaced the coolant temp. sensor and every thing is o.k. Thank's for the help. Your advise was right on."

c17hydro
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SOURCE: GMC Envoy w/ code P0128

Start at $89 right off the bat just for diagnostics and then depending on what they find that is causing that fault, at LEAST one hour labor, plus parts....I would say $250 is a good ballpark figure....looking up your fault code now.

Posted on Aug 28, 2009

  • 1986 Answers

SOURCE: I have a code P0128, what is my problem.

This code is for your Coolant Thermostat - It's detected that the Coolant Temperature is below the Thermostat Regulating Temperature

This code may mean one or more of the following has occurred:

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Cooling fan running too much
  • Faulty coolant temperature sensor (ECT)
  • Faulty intake air temperature sensor (IAT)
Check the following to see if it resolves your problem:
  • verify coolant strength and level
  • verify cooling fan operation and replace if necessary
  • verify ECT sensor operation and replace if necessary
  • verify IAT sensor operation and replace if necessary
  • if all above checks out, replace the thermostat

Posted on Oct 16, 2009

Testimonial: "Very helpful thanks a lot."

  • 24 Answers

SOURCE: diagnostic code P0128 on a 2002 chevy astro van

you could shotgun both parts and replace both...or just remove the thermostat. place it in a pot of water with a thermometer and warm it up. watch when it opens. if it opens before the temp stamped on the theormostat then it is bad and will not require replacement of the temp sensor. If it opens at the temp on the t-stat then replace the sensor. Rarely caused by sensor. Mostly caused by t-stat. no need to spend the money on both when you only need one.

Posted on Nov 28, 2009

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What does the code p0128 means on a 2003 chevy trailblazer


change the thermostat to a 190 degree . disconnect one of the battery terminals for a few seconds to clear the code that should work

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Code P0128 is for the cooling system you should replace the thermostat. Code P0130 H02S circuit closed loop (cl) performance (bank1 sansor1) you have to replace the #1 oxygen sensor.

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Code p0128 chevy 2500hd 6.0


Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature

Does the water temp gauge in the dash work? I'd be willing to bet it doesn't. Turn ignition on, check for voltage at water temp sensor harness. If voltage is present, replace water temp sensor. Check the air temp sensor also. If there's no voltage, find out why. Maybe both sensors are on the same harness on this truck and it has become disconnected somehow?
Wish i could offer more specifics but i don't have a wiring diagram handy. Good luck.

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My factory cd player in my 2001 chevy cavalier wont read cd's so i put a factory cd player from another chevy cavalier and now the screen says locked


Most radios and cd players in cars require a code to get them operating again after they have been disconnected from the battery for an extended time. Hopefully a dealer could help you locate the code for that model.

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2 Answers

2003 chevy cavalier with no heat and temperature doesn't rise past 40 degrees engine code P0128 comes up when checked and the thermostat and radiator have been replaced still isn't fixed what do i do?


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
Possible Solutions

Feb 27, 2011 | 2003 Chevrolet Cavalier

1 Answer

I have a 2004 Chevy Impala. As I was driving home yesterday I had the heater on full blast - temp outside appx. 60. The check engine light came on and I had a P0128 code. Could this be due to keeping...


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.


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

Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:

  • 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


REFERENCE: http://www.obd-codes.com/p0128


I hope this helps a bit!

Jan 11, 2011 | 2002 Chevrolet Venture Passanger

1 Answer

2007 Chevy Cobalt with p0128 and "---" temp reading


The P0218 Code is primarily intended to indicate a faulty thermostat.
Have the thermostat replaced

Other possible causes that could trigger this code would be:
Low engine coolant level
faulty cooling fan
faulty coolant temperature sensor
faulty intake air temperature sensor


Sep 08, 2009 | 2006 Chevrolet Malibu

1 Answer

P0128 code


Unless the car is overheating you probably just have a bad temperature sensor probably located on the intake manifold....

Apr 03, 2009 | 2002 Chevrolet Impala

1 Answer

Check light on Chevy Malibu 2002


P0128 - Coolant Thermostat Below Thermostat Regulating Temperature
REPLACE THE THERMOSTAT THE ENGINE IS NOT REACHING CORRECT OPERATING TEMPERATURE, 190-195 DEGREE'S FAHRENHEIT.

Feb 17, 2009 | 2002 Chevrolet Malibu

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