2007 c6 radiator fan issues
Melting Slicks
Joined: Aug 2004
Posts: 2,914
Likes: 229
From: Oakbank Manitoba
It would have the most recent file from GM installed. You might need to do a security relearn and perhaps a Crankshaft variation relearn with your scan tool once it is installed. Most higher end scan tools will be able to accomplish this.
This way you can have the car running with a stock "up to date" valid tune and a good known ECM before taking it to the tuner for dyno pulls and recalibration. Do a search on E Bay for 12597121. Look for one sold by FlashMaster (approximately $150 shipped). Have your VIN number written down. They have been around for a good few years.
This way you can have the car running with a stock "up to date" valid tune and a good known ECM before taking it to the tuner for dyno pulls and recalibration. Do a search on E Bay for 12597121. Look for one sold by FlashMaster (approximately $150 shipped). Have your VIN number written down. They have been around for a good few years.
Last edited by KENS80V; Feb 1, 2026 at 03:01 PM.
Thread Starter
Heel & Toe
Joined: Jan 2026
Posts: 22
Likes: 2
It would have the most recent file from GM installed. You might need to do a security relearn and perhaps a Crank relearn with your scan tool once it is installed. Most higher end scan tools will be able to accomplish this.
This way you can have the car running with a stock valid tune and a good known ECM before taking it to the tuner for dyne pulls and recalibration.
This way you can have the car running with a stock valid tune and a good known ECM before taking it to the tuner for dyne pulls and recalibration.
Thread Starter
Heel & Toe
Joined: Jan 2026
Posts: 22
Likes: 2
It would have the most recent file from GM installed. You might need to do a security relearn and perhaps a Crankshaft variation relearn with your scan tool once it is installed. Most higher end scan tools will be able to accomplish this.
This way you can have the car running with a stock "up to date" valid tune and a good known ECM before taking it to the tuner for dyno pulls and recalibration. Do a search on E Bay for 12597121. Look for one sold by FlashMaster (approximately $150 shipped). Have your VIN number written down. They have been around for a good few years.
This way you can have the car running with a stock "up to date" valid tune and a good known ECM before taking it to the tuner for dyno pulls and recalibration. Do a search on E Bay for 12597121. Look for one sold by FlashMaster (approximately $150 shipped). Have your VIN number written down. They have been around for a good few years.
Safety Car
Joined: May 2006
Posts: 3,696
Likes: 492
From: Potomac MD
Good news
So basically the G Speed fan will only work with stock fan tune as the previous owner tune had touched this section or was your e c m fan circuit bad.
Last edited by double06; Feb 7, 2026 at 02:35 PM.
Thread Starter
Heel & Toe
Joined: Jan 2026
Posts: 22
Likes: 2
