frequent failuer of cooling system and AC after flashing

[odd boy]

Hi,

In many occasion when I tune E38 ecus, the engine coolant gauge fails and the AC goes off. In some events, code P0128 gets on. If I remove the battery or clear the code the car goes back to normal but the issue appears again later after sometime.

If I return the stock file back, the problem goes away for ever. Please advice what could be the reason.

Thanks in advance,

[GMPX]

What year / model vehicle?

[odd boy]

It happened with many cars, the following list is what I recall:

Yukon--------12614088---2008
Tahoe--------12639835---2011
G8 (Holden)---12612381---2007

Mainly happened with the Sierra, Tahoe, Yukon, and G8 Holden version for the middle east. Any model 2007+ but not all of them--

[GMPX]

Ok, all E38 vehicles, anyone else seen this problem?

[odd boy]

By the way in few cases, this issue goes off when I set P0128 to no mil and not reported in case a thermostat is installed and the fan batch is applied. However, MOST of the time it doesn't clear out and stays there until I return back the stock file especially with the stock car "without thermostat installed".

for Example,

Yukon--------12614088---2008 is a stock car with out thermostat installed. He came to me yesterday with the issue and it cleared out only with the stock file.

G8 (Holden)---12612381---2007 , I encountered two cars with the same issue, both had thermostat installed. One of them got resolved with switching off P0128 and the other one needed to go back to stock.

Another example, Tahoe 2007 but I don't have the file in hand now. with out thermostat installed and needed to go back stock.

Please lemme know if the above explanation is unclear.


Thanks,

[etmotorsports]

I have noticed on a 2010 camaro after a flash the ac isn't working but to be honest the cars a/c didn't work very well even before i retuned it. I need to check that out after the idle issue is fixed ill let you know if i see any a/c issues.

[odd boy]

I had the same issue again with two cars today, any help please...

[GMPX]

Odd Boy, the ones you have trouble with, are these only with the thermostat removed and the Fan rescale patch applied?

[odd boy]

yes sir, except one Yukon--------12614088---2008

I don't want to push you but I am losing these customer, they think I made problems to their cars!!!! :confused:

[GMPX]

Odd Boy, I think you need to do a process of elimination. If you can put the stock file back in and everything starts working again then it's got to be something being modified in the tune that is causing it.
Like the Yukon, have a look at the history of changes and think about something that has been disabled that may have upset the A/C system. I must admit I can't think of what could be causing it. I know David posted in this thread about a 2010 Camaro that has been a problem car for him that is having A/C issues, but apart from you two I have not heard of these sort of problems with E38's, unless files from different vehicles are flashed in.

[odd boy]

I had the same issue again with two cars today, any help please...

I don't play with abnormal stuff, I mean I alter fuel, timing,...etc. This problem started with me since using this build 156. Before I had no problem.

Thanks,

[odd boy]

Do you think running the new update "August candidate 2" will eliminate the issue???

[GMPX]

I would certainly give that a shot.
Are you updating the V2 firmware with each update as well?

[odd boy]

sure I do update the firmware

[GMPX]

I'm sorry I don't know what to do for you. That's not to say we've given up, we just don't know what to do.

[etmotorsports]

I got the 2010 camaro to work today with a flash and i noticed the ac was blowing colder out the passenger side and the driver side was hot almost like ambient air temp, i asked the customer and the car has always done that so it isn't tune related, i asked around and have heard of other gm models exhibiting the same issue there are a couple of air temp motors and air blend motors that can cause this not to mention if it has auto climate control those are notorious for going out.

[odd boy]

I called up one of those customers who have the issue, hopefully he passes by me soon to test the update on his car.....

[odd boy]

the issue is still there with the new update, please help I am losing customers

[joecar]

odd boy,

do you have V7/V8 build 178/168 and firmware 2.07.21 from here: Release-Candidate-2-Aug-19-2011 (http://forum.efilive.com/showthread.php?17096-Release-Candidate-2-Aug-19-2011)

[Tordne]

We've not had any similar things mentioned so we're thinking there there is a potential that the file your flashing may have been corrupted by an older V7 software release. Do you have an old calibration file for the vehicle that you'd be able to modify using the latest V7 software release and flash? Or perhaps even a stock file for the car?

[minytrker]

Ok, all E38 vehicles, anyone else seen this problem?

I usually tune several E38's every week and have never experienced this. I did however have a couple issues with some vehicles I tuned when that one update had a few glitches in it. I since then just re-tuned them starting with a new good stock tune and that cleared everything up. With the latest update and firmware my V2 is actually been working flawless with zero problems.

[odd boy]

I am using the latest update "Release-Candidate-2-Aug-19-2011". I will see another customer and re-read the stock file and starts from there.

[izaks]

Whenever you put a lower temp thermostat / lower the fan temps, P0116/P0128 will trip and the A/C will be disabled.
You have to set P0116/P0128 to not reported

[odd boy]

Thanks 4 the advice. When I used the new update the issue disappeared.

[izaks]

Condiitions for setting DTC P0128 (2007/2008)
The ECM detects that the minium ECT of 75'C has not been met, when the IAT is more than 10'C
OR
The ECM detects that the minium ECT of 55'C has not been met, when the IAT is less than 10'C

The ECM uses the start-up ECT and the start-up IAT to begin the diagnostic calculation. The air flow into the engine is accumulated and the vehicle speed, distance and egine run time are also factored to determine if the ETC does increase normally, and reach the calbrated target temperatures.

Condiitions for setting DTC P0116 (2007/2008)
The ECM detects a temperature difference at power up that indicates that the ECT sensor is 25'C more than the IAT
OR
The ECM detects a temparature difference at power-up that indicates that the ECT is 15'C more than the IAT and the time spent cranking the engine is more than 10 sec, when the fuel level is more than 5%
OR
With the power-up IAT more than -7'C, the ECM detects a temperature difference at power-up that indicates the ECT sensor is 15'C more than the IAT. Then the vechile must be driven for more than 6 min and 40 sec at more than 24km/h. If the IAT then does not decrease more than 8'C, DTC P0116 will set

Got to love those mad Holden/GM scientists !

[odd boy]

That is really a scientific answer. Where're u at the beginning. Love that answer