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#1 Old 03-31-2008, 10:11 PM
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P0128 check engine light code

Hello,

I'm getting a P0128 code on my 2003 V4 Camry. Autozone diagnosis says it's either
a) coolant low level
b) sensor not working correctly
c) thermostat not working correctly.

As part of 90k mile check about 3500 miles ago, the mechanic replaced the coolant. I didn't check the coolant after he had replaced it but I just checked it today and it's about 1 inch below the full level. Is this normal coolant usage considering that it's been about 3500 miles and 3 months since it was last filled?

If the coolant level is okay, then how do I figure out if it's the sensor/thermostat?

Thanks,
Kunal
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#2 Old 04-01-2008, 10:06 AM
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Gen5

Quote:
Originally Posted by sufloyd View Post
Hello,

I'm getting a P0128 code on my 2003 V4 Camry. Autozone diagnosis says it's either
a) coolant low level
b) sensor not working correctly
c) thermostat not working correctly.

As part of 90k mile check about 3500 miles ago, the mechanic replaced the coolant. I didn't check the coolant after he had replaced it but I just checked it today and it's about 1 inch below the full level. Is this normal coolant usage considering that it's been about 3500 miles and 3 months since it was last filled?

If the coolant level is okay, then how do I figure out if it's the sensor/thermostat?

Thanks,
Kunal
Code P0128 means that the coolant temperature is below the thermostat regulating temperature.

I doubt that you actually used coolant. I'm guessing that there was an air pocket in the system. Fill the coolant to the proper level and check for leaks. What is your engine/coolant temperature?

If the temperature is ACTUALLY low, you will need a new thermostat. If the temperature is ACTUALLY normal but the sensor shows it's low, you need a new sensor.

I'd start with filling the coolant up and clearing the code.

By the way. Your car is an I4 (inline 4 cylinder), not a V4.

Welcome to TN.

Here's cooling system link for you: http://www.camrystuff.com/manuals/Gen5/16_Cooling.pdf

EDIT: Note that the problem could be something else also. It could be a faulty ECM (computer), wiring, etc.


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My Camry and my Formula are here: http://www.cardomain.com/id/1995RAMAIR

Last edited by TRD VVTi; 04-01-2008 at 10:12 AM.
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#3 Old 04-01-2008, 10:23 AM
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To add to TRD's explaination:

DTC P0128 COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

CIRCUIT DESCRIPTION

DTC Detecting Condition

HINT:
This is the procedure of thermostat.

If the engine coolant temperature becomes less than 75 °C (167 °F) , it is abnormal.

If not due to the thermostat malfunction, it is abnormal.

Step 1 - 2
INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was

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#4 Old 04-01-2008, 05:40 PM
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Replace your T-stat and properly "burp" the system and you should be all good.
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#5 Old 04-01-2008, 05:53 PM
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unless it is the sensor or some other thing then he wasted time AND money...


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#6 Old 04-02-2008, 02:21 PM
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Quote:
Originally Posted by TRD VVTi View Post
Code P0128 means that the coolant temperature is below the thermostat regulating temperature.

I doubt that you actually used coolant. I'm guessing that there was an air pocket in the system. Fill the coolant to the proper level and check for leaks. What is your engine/coolant temperature?

If the temperature is ACTUALLY low, you will need a new thermostat. If the temperature is ACTUALLY normal but the sensor shows it's low, you need a new sensor.

I'd start with filling the coolant up and clearing the code.

By the way. Your car is an I4 (inline 4 cylinder), not a V4.

Welcome to TN.

Here's cooling system link for you: http://www.camrystuff.com/manuals/Gen5/16_Cooling.pdf

EDIT: Note that the problem could be something else also. It could be a faulty ECM (computer), wiring, etc.
Thanks for the tips. Basic question - how do I check the coolant temperature? As in, should I insert a thermometer in the radiator when the car has warmed up after a few minutes ? (but not after a long run, to prevent burns)
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#7 Old 04-02-2008, 03:44 PM
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Quote:
Originally Posted by sufloyd View Post
Thanks for the tips. Basic question - how do I check the coolant temperature? As in, should I insert a thermometer in the radiator when the car has warmed up after a few minutes ? (but not after a long run, to prevent burns)
Checking the coolant temperature after a few minutes isn't going to do any good at all. After all, it takes quite a while for the cooling system to get hot.

What does your gauge read?

My Prizm (Corolla) had a coolant temp fault code and I noticed that the gauge was running lower than normal. I replaced the thermostat because of that and cured the problem.


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#8 Old 04-02-2008, 04:34 PM
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Quote:
Originally Posted by TRD VVTi View Post
Checking the coolant temperature after a few minutes isn't going to do any good at all. After all, it takes quite a while for the cooling system to get hot.

What does your gauge read?

My Prizm (Corolla) had a coolant temp fault code and I noticed that the gauge was running lower than normal. I replaced the thermostat because of that and cured the problem.
Even after an hour's driving, the temperature gauge rises 2 notches up (and no more than that) from the C level. Does this mean it's likely a thermostat issue?
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#9 Old 04-02-2008, 04:39 PM
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Quote:
Originally Posted by sufloyd View Post
Even after an hour's driving, the temperature gauge rises 2 notches up (and no more than that) from the C level. Does this mean it's likely a thermostat issue?
Yes, very likely as posted before.
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#10 Old 04-03-2008, 10:43 AM
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Quote:
Originally Posted by njerald View Post
Yes, very likely as posted before.
+1

Unless of course, your coolant is so low that the temperature sending unit isn't reading correctly, or the sending unit itself is faulty.

There are still many different things that it could be, but I'm reasonably certain that your thermostat is causing the problem. Don't buy a cheap one. Just get it from the dealer. They're cheap enough anyways.


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#11 Old 07-23-2013, 05:46 PM
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I had P0128 and P0128 (pd) code on 2001 camry with only 55k miles, check temperature gauge shows low up to long time and when i drive in traffic was showing normal, decided to change thermostat with OEM, Got from dealer for $28 + $6 for seal. just open it to see thermostat ,is leaking from side. The shaft looks bend. Will tell you after 100 mil driving. cleared code with ODBII.

Last edited by heat_z0ne; 07-23-2013 at 05:53 PM.
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