Wrench light
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New User
Joined: Jul 2011
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From: Humble TX
Wrench light
My wrench light comes on after 20mins of highway driving. It doesnt come on when driving in the city. I have used my scanner and it shows no codes. The truck drives just fine when the light comes on. No loss of power or limp mode. Any suggestions on whats causing this? Thanks
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New User
Joined: Jul 2011
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From: Humble TX
Its a innova digital can obd2 scanner. I bought it from oreilly auto parts last year. Its a pretty generic scanner. I have heard that the auto zone scanners wont pick up the code but its worth a shot to try. Thanks
Senior User
Joined: Jul 2008
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From: Ohio
Same thing happened to me a few weeks ago, although once I shut it off and turned it back on, the wrench has not been back. I bought a Scangauge II to monitor my ECT vs. EOT and I think my oil cooler is the culprit. Keep us posted if you find out something else is causing the problem.
FTE Legend
Joined: Jul 2005
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From: Millersville, MD
If you have the innova CAN version, it should pull all the codes.....mine does! Mine is the Model 3130
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New User
Joined: Jul 2011
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From: Humble TX
I have the 3100. I read the codes with the key turned but not the engine running. Could that be the problem? I dont think mine reads the ECT or EOT. I have heard that it could be the acceleration pedal sensor/throttle control unit or the oil cooler. Im just at a loss of what it could be. Thanks for all the help guys!!!
Senior User
Joined: Oct 2004
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From: N. Carolina
My wrench light comes on after 20mins of highway driving. It doesnt come on when driving in the city. I have used my scanner and it shows no codes. The truck drives just fine when the light comes on. No loss of power or limp mode. Any suggestions on whats causing this? Thanks
Also ... AutoZone scanners will not pick up wrench light codes, you'll need to go to the dealer or get something like an Edge Insight CS.
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New User
Joined: Jul 2011
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From: Humble TX
Yeah i think its the oil cooler also. When the light comes on it doesnt lose power or go into limp mode so i think its not the turbo. I guess im gonna have to break down and take it in. Thanks for the help!
Tuned
Joined: Jul 2010
Posts: 360
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From: Greenville, SC
I 3rd the oil cooler diagnosis. Mine wrench light came on last year driving on the interstate. As I recall, a short drive wouldn't turn it on. But it was the oil cooler efficiency.
I replaced the oil cooler and it never came back on.
If you do it yourself, you may consider doing an EGR delete and having your intake manifold flushed, since it's all gonna be sitting out on your workbench anyway.
Replace the screen under the oil cooler while your in there.
I'd recommend flushing the cooling system with VC-9 thereafter. There's a good procedure detailed here at FTE by "beachbumcook".
After that, you should be G-to-G (good to go).
C-Rig
I replaced the oil cooler and it never came back on.
If you do it yourself, you may consider doing an EGR delete and having your intake manifold flushed, since it's all gonna be sitting out on your workbench anyway.
Replace the screen under the oil cooler while your in there.
I'd recommend flushing the cooling system with VC-9 thereafter. There's a good procedure detailed here at FTE by "beachbumcook".
After that, you should be G-to-G (good to go).
C-Rig
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