Question about 2003 Chevrolet Impala

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P0128 AND P0300 - 2003 Chevrolet Impala

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  • lee_eshelman Jun 24, 2009

    what would cause P0300 and how serious is it?

  • lee_eshelman Jun 24, 2009

    WHAT CAUSES A 2003 IMPALA CODE P0300? HOW SERIOUS IS IT?

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PO128 is better..

Posted on Jun 24, 2009

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Hi,

DESCRIPTION:
This bulletin provides the procedure to update the ECM software of some
ENTOURAGE (EP) 3.8L and SANTA FE (CM) 3.3L vehicles which exhibit malfunction
indicator lamp illuminated with DTC P0110, P0128, or P0300.
- P0110: Intake Air Temperature Circuit Malfunction
- P0128: Engine Coolant Thermostat Stuck Open
- P0300: Random/Multiple Cylinder Misfire Detecte

Thanks for contacting Fixya

Posted on Jun 24, 2009

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1 Answer

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

Read more at: http://www.obd-codes.com/p0128
Copyright © OBD-Codes.com

Feb 04, 2015 | Cars & Trucks

1 Answer

Error code P0128


Trouble Code: P0128

Thermostat Range/Performance

Trouble Code Conditions: DTC P0107, P0108, P0112, P0113, P0116-118, P0335, P0336, P0300-P0306, P0401, P0505, P1106-P1108, P1259 and P1519, engine running at road load for 10 minutes, and the PCM detected the ECT sensor input did not reach the correct closed loop value. Note: It is possible for this code to set if the engine is left running while the hood is open for an extended period in a warm climate.

Possible Causes:


Inspect for low coolant level or for an incorrect coolant mixtureCheck the operation of the thermostat (it may be stuck open)TSB 01-064 (9/11/01) contains a repair procedure for this code

Jan 27, 2013 | 2001 Honda Civic 1.7

1 Answer

Po128 po131 po300 po463


P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0463 Fuel Level Sensor Circuit High input

obd2 code scanner

Aug 16, 2012 | 2000 Buick LeSabre

1 Answer

I am getting codes PO 128, PO 300 and PO 506 on my chevy Impala, 2002, LS 3.8


code P0128 ECT ( electronic coolant temperature ) engine temperature to low ( replace thermostat ).

code P0300 engine miss fire detected ( replace spark plugs and spark plug wires )

code P0506 IAC ( idle air control ) system idle to low ( clean the IAC valve if problem persists replace the IAC valve )

Apr 15, 2011 | 2002 Chevrolet Impala

1 Answer

SES light coming on. P0128 code from auto parts place. what do i do to fix this myself?


Hi, you have a faulty thermostat, so you should just need a thermostat, associated gasket (or gasket maker), and some fresh antifreeze. Consult a vehicle-specific manual for specifics on your particular engine.

More P0128 info @ http://www.obd-codes.com/p0128

Feb 09, 2010 | 2004 Pontiac Grand Am

3 Answers

2006 pont grand prix when car gets warm it starts misfiring i will scan it code po300 comes up and code po 128


P0300 is a code for multiple misfire. Which could be created to the P0128
P0128 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.
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
Good luck and hope this helps. keep me posted, be glad to know your car is running 100% again soon.

Nov 04, 2009 | 2006 Pontiac Grand Prix

1 Answer

Po128,po155,po171,po300 These are the things that faile on my 2002 chevy blazer when I took it to the Maryland state emmissions test. Do you know what they are?


P0128 (Coolant thermostat-coolant temp below thermostat regulating temperature) Possible cause-Mechanical fault

P0155 (Heated oxygen sensor (H)2S)1, bank 2,-circuit malfunction) Possible cause Wiring, H02S, ECM

P0171 (System to lean, ban 1) possible cause intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), H02S

P0300 (Random/multiple cylinder(s)-misfire detected) Possible causes Spark plug(s), HT lead(s), injector(s), ignition coil(s), low compression, or wiring.

Sep 05, 2009 | 2002 Chevrolet Blazer

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