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Username Post: engine hot a/c turned off message???        (Topic#270791)
low budget 55 
Senior Member
Posts: 440

Loc: central ky
Reg: 11-24-05
10-18-11 06:14 PM - Post#2148722    

I get that message even when the engine is cold and the temp gauge doesnt work at all???
Its a newer body style 07 silverado with the 4.3 v6.
I replaced the temp sending unit but it still does the same thing until I pull the battery cable for about 10 minutes then the message clears and the temp gauge starts working fine???

I may drive 5 to 10 miles then it will bring up the message again and the temp gauge quits completely again kicking the radiator fans on when it happens.
Its not getting too hot according to the gauge when its working and I think it is showing correctly when does work as the engine doesnt seem to be overly hot at all.

Air in system?
Thermostat not opening correctly triggering this message to come up and stay on till I clear the computer by taking the cable off?
It may be slightly low on refrigerant on the a/c,would that cause it?

Help!


 
low budget 55 
Senior Member
Posts: 440

Loc: central ky
Reg: 11-24-05
10-19-11 05:29 AM - Post#2148863    
    In response to low budget 55

After further research I find this is a common problem that is all over the internet,I saw where one guy changed his thermostat and solved the problem according to his last post on another forum but most replies(mostly from dealer reps)say take it back to the dealer,if its still under warranty,
The dealer gets paid to fix it from GM,the owner gets it fixed.Win,Win I guess if you dont count the hassle the owner has to go threw
Like one guy said, GM has to know about this,
Im sure they figure its just cheaper for them to fix the ones that come back before the warranty runs out than to do a total recall

 
Chevrolet Customer Service 
Contributor
Posts: 207
Chevrolet Customer Service
Reg: 07-05-10
10-19-11 09:25 AM - Post#2148932    
    In response to low budget 55

I am glad to hear that you are planning to work with your local dealer regarding your concern. Please feel free to keep me posted regarding your progress. Thank you.

Tricia, GM Customer Service.
>>>>>> Please check out the new Chevrolet Owner Center at https://my.chevrolet.com/ for more vehicle information!


 
low budget 55 
Senior Member
Posts: 440

Loc: central ky
Reg: 11-24-05
10-19-11 01:03 PM - Post#2149018    
    In response to Chevrolet Customer Service

I replaced the thermostat after confirming it with a local dealer that the thermostat was probably the problem.
The new thermostat fixed it
The gauge quiting etc.etc. sure wasnt pointing to be just a bad thermostat to me but Im sure glad it fixed it


Edited by low budget 55 on 10-19-11 01:05 PM. Reason for edit: No reason given.

 
WR Dave 
Member
Posts: 30
WR Dave
Age: 52
Loc: Calgary Ab. Canada
Reg: 10-11-03
11-18-11 10:28 AM - Post#2159376    
    In response to low budget 55

Mine started doing this at the end of last winter, and then over the summer it never did it once. Now we have our first cold day and it does it again on the way to work. If it's just a t-stat, why wouldn't it do this all summer as well??? Does anyone have any other info, are there any internal recalls at GM that we should know about???

WR Dave
2007 Silverado 5.3l LTZ Silver, Leather. ,1969 Chevelle Malibu 396 T400 12 bolt Posi:


 
WR Dave 
Member
Posts: 30
WR Dave
Age: 52
Loc: Calgary Ab. Canada
Reg: 10-11-03
11-18-11 02:42 PM - Post#2159467    
    In response to WR Dave

I have no results yet as I just did a change and will report back. The change I made was suggested by a friend of mine who is a GM trainer at a tech school. He said that sometimes sticky fan relays can cause the problem, so I have changed the relays ( traded out of the new parts truck at work ) and will see what happens in the next few days. WR Dave
2007 Silverado 5.3l LTZ Silver, Leather. ,1969 Chevelle Malibu 396 T400 12 bolt Posi:


 
WR Dave 
Member
Posts: 30
WR Dave
Age: 52
Loc: Calgary Ab. Canada
Reg: 10-11-03
11-21-11 11:39 AM - Post#2160354    
    In response to WR Dave

No solution yet, it still did it again this morning. Has anyone been in contact with GM over this and recieved some sort of explanation? I am finding this same complaint in Corvette, Cadillac, Buick forums etc. I'm starting to think there is a programming issue that is common to all GM vehicles or a component issue common to all GM's. ANyone from GM on here that would like to help?? WR Dave
2007 Silverado 5.3l LTZ Silver, Leather. ,1969 Chevelle Malibu 396 T400 12 bolt Posi:


 
WR Dave 
Member
Posts: 30
WR Dave
Age: 52
Loc: Calgary Ab. Canada
Reg: 10-11-03
11-21-11 01:53 PM - Post#2160386    
    In response to WR Dave

OK, I got a new answer. Apparently "IF" you use the block heater AND you use the "REMOTE START" the ECM sees a huge difference in the engine temp versus the ambient air inlet temp and when the engine completes it's first heat cycle the code is displayed on the message center. So with this in mind I have copied the repair that is recommended.

_________________________ _______________
#10-06-04-008B: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures when Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate ECT Sensor and Engine Coolant Heater Cord) - (Jun 22, 2011)
Subject:
Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures when Using Engine Coolant Heater, DTC P0116 and/or P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord)

Models: 2006-2007 Buick Rainier
2009 Buick LaCrosse Super, Allure Super (Canada Only)
2006-2012 Cadillac Escalade
2006-2007 Chevrolet Monte Carlo
2006-2009 Chevrolet Impala SS, TrailBlazer
2006-2012 Chevrolet Avalanche, Express, Silverado, Tahoe
2006-2009 GMC Envoy
2006-2012 GMC Savana, Sierra, Yukon
2006-2008 Pontiac Grand Prix
2006-2009 Saab 9-7X
Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6
Please Refer to GMVIS

_________________________ _______________
To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord. This bulletin is being revised to update the model years to 2012. Please discard Corporate Bulletin Number 10-06-04-008A (Section 06 – Engine/Propulsion System).
_________________________ _______________
Condition



Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant heater in very cold ambient temperatures. This usually occurs in a range of −23 to −40°C (−10 to −40°F) or colder.
The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History.
Cause



This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being outside of a calibrated range.
Correction



Important: DO NOT replace the ECM for this condition.
Relocating the ECT Sensor
1. Turn ON the ignition with the engine OFF.
2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI.
⇒ If DTC P0116 and/or P1400 are set and the customer
WAS using the engine coolant heater, proceed to Step 3.
⇒ If DTC P0116 and/or P1400 are set and the customer
WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC) List - Vehicle in SI.
3. Turn OFF the ignition.
Warning To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if the radiator cap or the surge tank cap is removed while the engine and radiator are still hot.
4. Remove the surge tank fill cap from the surge tank or the coolant pressure cap from the radiator.
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
6. Place a clean drain pan under the radiator drain cock or under the lower radiator hose depending on the vehicle. Refer to Cooling System Draining and Filling in SI.
7. Loosen the radiator drain cock if equipped or use J 38185 clamp pliers and reposition the clamp on the lower radiator hose at the radiator.
8. Remove the end of the lower radiator hose from the radiator.
9. Drain the engine coolant sufficiently below the level of the ECT sensor.
10. Close the radiator drain cock or connect the lower radiator hose at the radiator.
11. Use the J 38185 clamp pliers to place the clamp into the original position on the hose.
12. Lower the vehicle.



13. Disconnect the wiring harness connector from the ECT sensor (2).



14. Remove the ECT sensor (1) from the front of the cylinder head.
15. Remove the corresponding size plug at the rear of the
OTHER cylinder head.
16. Coat the threads of the ECT sensor with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent.
17. Install the ECT sensor in the hole of the cylinder head where the plug was removed.
Tighten
Tighten to 20 N•m (15 lb ft).
18. Coat the threads of the plug with sealer. Use GM P/N 12346004 (Canadian P/N 10953480) or an equivalent.
19. Install the plug in the hole of the cylinder head where the ECT sensor was removed
Tighten
Tighten to 20 N•m (15 lb ft).
Important: Leave enough wire attached to the ECT sensor harness connector in order to create manageable splices that are at least 40 mm (1.5 in) away from the other splice.
20. Extract a portion of the ECT sensor harness wiring and connector from the protective conduit. Cut off the ECT sensor harness connector and wiring.
21. Determine a routing path for the ECT sensor jumper harness wires so that they can be secured
TO or
WITHIN an existing protective conduit.
Note: This step is to set up and verify the length of wiring that is required before cutting.
22. Route the ECT sensor jumper wires and then enclose them in their own protective conduit in order to
VERIFY the length that is required.
23. Cut the ECT sensor jumper wires to the appropriate length.
Note: Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector.
24. Splice the ECT sensor jumper wires to the
ORIGINAL ECT HARNESS LOCATION using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI.
Note: Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splice or connector.
25. Splice the ECT sensor jumper wires to the
ECT SENSOR HARNESS CONNECTOR using DuraSeal weatherproof splices. Refer to Splicing Copper Wire Using Splice Sleeves in SI.
26. Connect the ECT sensor harness connector to the ECT sensor.
27. Secure the ECT sensor jumper wires that are in their own protective conduit
TO or
WITHIN the existing harness conduit using tie straps.
Important: You
MUST run the engine at the specified RPM and until it reaches normal operating temperature and then allow it to idle as indicated in SI. The engine
MUST then be allowed to cool down in order to top off the coolant level as needed.
28. Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling in SI.
29. Pressure test the cooling system. Refer to Cooling System Leak Testing in SI.
30. Use a scan tool to clear any DTCs.
2007 Silverado 5.3l LTZ Silver, Leather. ,1969 Chevelle Malibu 396 T400 12 bolt Posi:


 
WR Dave 
Member
Posts: 30
WR Dave
Age: 52
Loc: Calgary Ab. Canada
Reg: 10-11-03
11-29-11 10:20 PM - Post#2163391    
    In response to WR Dave

Although it seems that I am talking to my self, I will add the correction info to this thread. I have to start by saying that I have a Wester's tune in my PCM and after talking to Lyndon Wester, he said that he can turn the feature off in my PCM, that causes the code and fault message to appear. So I will no longer have the problem.
It seems that GM has programmed our PCMs to look at the difference in temp between the engine coolant and the air inlet, and if the engne has been off for 8 hours it will set the code after the engines first warm up cycle, when the temps don't match closely enough. Also if you believe that your block heater isn't working it is likely due to the stock block heater cord having a thermatic switch molded into it,that opens the circuit anytime the end of the cord sees any temp warmer than -18 C or 0 F. I don't know about you guys but I plug my engine in long before it gets that cold. Is GM trying to sell more parts by prematurely causing engine wear on start up due to a very cold engine???
I call dirty pool on GM's par on this one and I have always been a huge supporter, but crap like this gets me a little riled up. All they have to do is program out the timer and change the cord so we can actually start a warm engine during some very cold days ahead.

WR Dave
2007 Silverado 5.3l LTZ Silver, Leather. ,1969 Chevelle Malibu 396 T400 12 bolt Posi:


Edited by WR Dave on 11-29-11 10:22 PM. Reason for edit: No reason given.

 
4reelmoto 
Forum Newbie
Posts: 1

Reg: 04-30-12
04-30-12 04:25 PM - Post#2220802    
    In response to low budget 55

@ Low Budget 55, thank you so much for your post comment in regards to this... For the last 4 months I have had an on/off problem with this till a couple of weeks ago (2007 4.3 Silverado W/T), then it was here to stay. Since it first showed up even the best Snap-On diagnostic still would show no solution, only that it actually was running cooler than normal (which meant it was also running rich). The closest I got was that it was somewhere between the PCM and the Body Module, the Body Module showed that all the gauges were working properly.
I seen this post topic and I replaced the thermostat... problem solved...
Thanks again.

 
naedoba 
Forum Newbie
Posts: 1

Reg: 09-21-12
09-21-12 09:01 AM - Post#2271872    
    In response to 4reelmoto

This happened to me three times in my 2008 Silverado (4.3 V6). I took it to the dealer and they replaced the thermostat free of charge under the powertrain warranty. Aggravating, but at least it was a free fix. Thanks to all in this thread for the heads-up on this.

 
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