• Hi Guest, welcome to TCG 2.0. Please refer to the FAQ in User Support before you do anything else. It will make the transition MUCH easier.

    IF YOU ARE SEEING AN "OOPS" ERROR PAGE, IT IS LIKELY BECAUSE YOUR BROWSER HAS NOT UPDATED YOUR CACHE. YOU CAN EITHER CLICK FORUMS AT THE TOP LEFT OR VISIT THECHICAGOGARAGE.COM AND BOOKMARK THAT. - Love, Mook

Threw a P0128

Eagle

Nemo me impune lacessit
Super Moderator
Joined
Mar 1, 2008
Messages
62,545
Reaction score
19
Location
Woodsticks, IL
Why suddenly would my car start doing this?

DTC P0128
Circuit Description
An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.

The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the regulating temperature of the thermostat, the diagnostics that use ECT as enabling criteria may not run when expected.

This DTC will only run once per ignition cycle within the enabling conditions. If the PCM detects the calibrated amount of air flow and engine run time have been met, and the ECT has not met the minimum thermostat regulating temperature, DTC P0128 sets.

Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0125, P0502, P0503 are not present.
The startup ECT is less than 75°C (167°F).
The intake air temperature (IAT) is more than -7°C (+19°F).
The engine run time is between 30-1,800 seconds.
The vehicle is driven more than 0.8 kilometers (0.5 miles) at more than 8 km/h (5 mph).
Conditions for Setting the DTC
The PCM detects that:

The calibrated amount of engine run time has been met.
The calibrated amount of engine air flow has been met.
The calibrated vehicle speed and distance have been met.
The calibrated ECT of 80°C (176°F) has not been met.




IN OTHER WORDS, BAD T-STAT OR ENGINE COOLANT TEMP SENSOR
 

Yaj Yak

Harbor Master
Donating Member
Joined
May 24, 2007
Messages
89,418
Reaction score
250
whats your temps doin
 

TommyGloves

Well-known member
Joined
Aug 23, 2007
Messages
5,649
Reaction score
13
Location
CHICAGO
What t-stat (deg) do you have installed? Like KJ said...what are your temps doing?
 

Stink Star Productions

You never had it so good!
Joined
Jan 20, 2008
Messages
12,120
Reaction score
17
Location
Big wood cock
if it were a ECT sensor it would throw a over/under voltage code 99% of the time.... i would suspect a stuck open thermostat, as that usually fixes this code.....
 

Eagle

Nemo me impune lacessit
Super Moderator
Joined
Mar 1, 2008
Messages
62,545
Reaction score
19
Location
Woodsticks, IL
Temps seem fine, car still makes fine and good heat... its a 180* AFAIK :dunno:
 

TommyGloves

Well-known member
Joined
Aug 23, 2007
Messages
5,649
Reaction score
13
Location
CHICAGO
Did you recently change the fan settings or are you running stock? Can you get a scan with ETC?

FWIW - I get this code on my SSEi once it gets cold out so I swap out my 180* for the 195*.

I've got an extra 195 t-stat (used) if you want it. (just come pick it up.) LMK
 

Eagle

Nemo me impune lacessit
Super Moderator
Joined
Mar 1, 2008
Messages
62,545
Reaction score
19
Location
Woodsticks, IL
I havent changed anything and it just started doing this over the past 2 days or so :dunno:
 

DanJoy

Well-known member
Super Moderator
Joined
May 25, 2007
Messages
28,262
Reaction score
74
Location
Aurora
I run a drilled 180 year round with no problem. Car hardly ever gets up to operating temps either. No codes.
 

firemandan1700

Bite my shiny metal ass
Joined
Apr 6, 2008
Messages
8,639
Reaction score
3
Location
LaSalle County
i never got this code until i put headers on my car. like it has anything to do with it anyways.

i just ignore it.
 

phat_ridegt

Well-known member
TCG Sponsor
Joined
Sep 16, 2007
Messages
3,351
Reaction score
1
Location
Ottawa
more than likely its been a co-incidence that you never got a 128 code before with a 180 stat....

it could be sticking open...but just clear it with your tuner...nothing to worry about if your temp gauge works
 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Top Bottom