Diablosport Forums

I made it home today after a long trip this week. Prior to getting home I stopped to use the restroom. Left my truck running. Returned and the check engine light was on. Arrived home and checked it with my programmer to see what was wrong. I recieved a trouble code of P0403 Exhaust Gas Recirculation Circ Error. What does this mean and what do I need to do to correct it. Thanks for any help.

Sounds like maybe the EGR valve has an issue.
I know there were some EGR recalls or TSBs on some LLY/LBZ trucks, I would return to stock and let the dealer check itout.

Thanks

Will do. Thanks.

Put truck back to stock tune a couple weeks ago and the dealer could not find any codes. I did not delete the codes, but when you put back to stock it clears any codes that are there. I told the dealer I pulled the codes with a buddys reader when the check engine light came on and they said sometimes the cheap readers will erase the codes. To make a long story short I have ran in stock tune that comes on the trucks and have had no luck in the check engine light coming on. When I put the pred tune back whether its 65hp or 85hp tune the light comes on after a short while and will go back off as well. Dont know what to do, but was in hopes the dealer would change the EGR circuit, but they only want to charge $116.00 to hook it up to their computer to tell you they cant find anything wrong. Any suggestions if the programmer is causing the light to come on.

Diablo. Any sugestions?

If you could supply us with your vin# and ecm calid number we can check and see if you have the latest update from GM that addresses this issue.
It is possible that with the tune installed it speeds up the process for the error code to appear vs running it with the stock tune.

mine did that on the 65 hp tune....i uploaded the 85 hp tune and ran it for a couple weeks without issues, then back down to the 65 hp tune again....been running it for about a month now with no issues.... although mine is an lb7

The check engine light finally came on with the stock tune, but the light comes and goes. Will be back at the dealer with it Friday. They are supposed to replace the egr circuit. I will still get the info you requested to check the updates.
Thanks Johan.

You could just need the newer flash update to resolve the issue.
You can type your vin into this site, http://tis2web.service.gm.com/tis2web
This will list the most current calibrations for you vin(works on any gm vehicle) then you can use the pred to check your files in the truck by selecting "show calid" if yours are older then you only need the flash update and the dealer wont need to tear into your truck.

Will check it out.
Thanks Johan.

I asume the last # on the page I pulled up is the latest calid. When I hooked up my pred and checked it the # in the pred is different. So how do I install the flash update to get the most current.


12604099 - Engine diagnostic

12606146

12602656

12603675

12604132

12604756

12604914

12604144

12606229

12610872

12615984

12616715

Part Number CVN Description
12616715 C69C7EB0 P0116, P0181, P0606, U0101, U1301, U0106 robustness improvements.
12615984 97A99E6A Turns off DTC P0230, DTC Robustness Improvements for P0401, P0403, P003A, P2146, P2149, P2152, P2155.
12610872 4FE8C09D Improves detection of DTCs P0090, P0116, P0181, P0201-P0208, P2149-P2152, P0606.
12606229 EC8B80E6 New calibration to reduce potential for setting DTC P2610 when battery is connected.
12604144 8E31570B New calibration to improve generic scan tool operation.
12604914 65D6F1FA New calibration with diagnostic enhancements for DTCs U1152 and P2199.
12604756 2E3F29F5 New calibration to address turbo learn failures occuring on hot restart.
12604132 CF0F6A72 New calibration with improved thermostat diagnostics.
12603675 40C633F9 New calibration to correct problem occuring at the assembly plant. Does not address any service issues.
12602656 N/A Part superceded due to part number reductions
12606146 00A61CEF New calibration to reduce potential for setting DTC P2610 when battery is connected.
12604099 6DDD13F1 Engine diagnostic calibration


Selected Options:
VIN: 1GTHK23D97F188144
Controller: ECM Engine Control Module

Last #'s on web site My Pred calid "s

Boot Software-12616700 12606130

Main Operating System-12616698 12606128

Speedometer-12616767 12606159

System-12616738 12606155

Fuel System-12616727 12610877


Engine Diagnostics-12616715 12610872

Engine Operation-12616703 12610870

Engine-12616787 12610878

Slave Operating System-12616699 12606129

My last post kind of ran together after submitting. The first set of #'s is from the web site i was given and the second is what is on my pred. Not for sure if it looked confusing or not.

My last post kind of ran together after submitting. The first set of #'s is from the web site i was given and the second is what is on my pred. Not for sure if it looked confusing or not.

Took it to the dealer Friday. Paper work stated: Code PO403 updated PCM and performed EGR valve moter clean procedure. Questioned them about replacing the EGR control circuit and they stated on this truck it dosnt have anything to be replaced just cleaned and updated. Left the dealer, came home and installed my pred tune and in no time WHAMO check engine light. So I put back in stock tune and by Sat. morning check engine light came back on without pred tune installed. After paying $369.14 they will have to take care of this problem. Any sugestions from anyone what might be going on.