[Z06] p1482 trouble code
Thread Starter
Racer
Joined: Jun 2006
Posts: 482
Likes: 8
From: Jacksonville Fl
p1482 trouble code
I just had this code pop up and it won't go away. I clear it but it keeps coming back. The fans work fine but I don't know where else to look. Not too much info about this. Any help would be awesome. Thanks
Daniel
Daniel
Racer
Joined: Mar 2010
Posts: 411
Likes: 81
From: Hackettstown NJ
PCM detects an improper circuit condition on the cooling fan clutch control circuit.
Racer
Joined: Mar 2010
Posts: 411
Likes: 81
From: Hackettstown NJ
Racer
Joined: Mar 2010
Posts: 411
Likes: 81
From: Hackettstown NJ
My program has a full page on this DTC P1482. It will not allow me to cut & paste. There is a long list, but bottom line seems to be: coolant- old or low, replace engine control module (ECM), replace cooling fan speed control module, or faulty electrical connections. Good luck, hope this helps.
Thread Starter
Racer
Joined: Jun 2006
Posts: 482
Likes: 8
From: Jacksonville Fl
Well I started messing around with it today and realized I don't have the connector that connects the harness to the fan control relay connector. Its just hard wired. So I took a look at connector at the control module and it looks like someone has messed with it before.
Just for S&G's, I cleared the code and then drove the car, drove fine. Parked it for awhile, when I started it back up it had the CEL back on. Driving home everything seemed fine until I turned the AC on.. I came to a stop and then realized that the AC wasn't blowing cold at the light, looked at the temp gauge and the temp was steadily climbing. Fans are no longer working.
Any thoughts on what would cause this, I'm looking at the control module.
Just for S&G's, I cleared the code and then drove the car, drove fine. Parked it for awhile, when I started it back up it had the CEL back on. Driving home everything seemed fine until I turned the AC on.. I came to a stop and then realized that the AC wasn't blowing cold at the light, looked at the temp gauge and the temp was steadily climbing. Fans are no longer working.
Any thoughts on what would cause this, I'm looking at the control module.
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Thread Starter
Racer
Joined: Jun 2006
Posts: 482
Likes: 8
From: Jacksonville Fl
So I was probing around with my volt meter and with the ac on and "key on" I had 11.7 volts at the connector that plugs into the control module. With the car off, I installed jumpers to test to see if the fan worked and when I got both jumpers in the fan turned on. Is that plug supposed to have a constant 12 volt source?
And with what I've written above, that would leave me to believe that the control module is indeed the problem. Any thoughts? Thanks again guys
Daniel
And with what I've written above, that would leave me to believe that the control module is indeed the problem. Any thoughts? Thanks again guys
Daniel
Tech Contributor
Joined: Oct 1999
Posts: 41,063
Likes: 9,827
From: Charlotte, NC (formerly Endicott, NY)
The fan doesn't receive a constant 12V. The supply voltage is pulsed.
From the SM:
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal.
Cooling fan speed is effected by many different conditions and can be adjusted from 10-90 percent duty cycle , 90 percent is considered high speed fan. When multiple cooling fan speed requests are received, the ECM uses the highest cooling fan speed of all the requests.
Some people who had tunes done on their cars programmed the fan module to run at max pulse width to cool the car. This usually caused the connector for the fan to overheat and and burn up (a forum search will show many instances of this). It sounds like that is what happened with your car. The connector was burned and somebody hardwired the fan in and with the circuit hardwired and the module still programmed to run full tilt the next failure could be the module itself.
Bill
From the SM:
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal.
Cooling fan speed is effected by many different conditions and can be adjusted from 10-90 percent duty cycle , 90 percent is considered high speed fan. When multiple cooling fan speed requests are received, the ECM uses the highest cooling fan speed of all the requests.
Some people who had tunes done on their cars programmed the fan module to run at max pulse width to cool the car. This usually caused the connector for the fan to overheat and and burn up (a forum search will show many instances of this). It sounds like that is what happened with your car. The connector was burned and somebody hardwired the fan in and with the circuit hardwired and the module still programmed to run full tilt the next failure could be the module itself.
Bill
Le Mans Master
Joined: Jan 2009
Posts: 6,113
Likes: 8
From: Pottsboro; Sometimes Dallas Texas
St. Jude Donor '12
The fan doesn't receive a constant 12V. The supply voltage is pulsed.
From the SM:
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal.
Cooling fan speed is effected by many different conditions and can be adjusted from 10-90 percent duty cycle , 90 percent is considered high speed fan. When multiple cooling fan speed requests are received, the ECM uses the highest cooling fan speed of all the requests.
Some people who had tunes done on their cars programmed the fan module to run at max pulse width to cool the car. This usually caused the connector for the fan to overheat and and burn up (a forum search will show many instances of this). It sounds like that is what happened with your car. The connector was burned and somebody hardwired the fan in and with the circuit hardwired and the module still programmed to run full tilt the next failure could be the module itself.
Bill
From the SM:
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal.
Cooling fan speed is effected by many different conditions and can be adjusted from 10-90 percent duty cycle , 90 percent is considered high speed fan. When multiple cooling fan speed requests are received, the ECM uses the highest cooling fan speed of all the requests.
Some people who had tunes done on their cars programmed the fan module to run at max pulse width to cool the car. This usually caused the connector for the fan to overheat and and burn up (a forum search will show many instances of this). It sounds like that is what happened with your car. The connector was burned and somebody hardwired the fan in and with the circuit hardwired and the module still programmed to run full tilt the next failure could be the module itself.
Bill
Tech Contributor
Joined: Oct 1999
Posts: 41,063
Likes: 9,827
From: Charlotte, NC (formerly Endicott, NY)
Cruising
Joined: Jun 2016
Posts: 10
Likes: 1
Hi Folks. I have read this thread with interest and tried a few of the fixes posted here but still having issues. Im new to this forum so forgive me if I posted this in the wrong section.
I'm desperate to solve this error code issue P1482.
Here are the details :
2007 Z06 LS7 motor 7 liter
Fully tuned with a Procharger, Boralla headers / exhaust, MSD
30k km
Last year my fan died and I replaced the fan, module, thermostat, all coolant with dexcool. All parts were GM parts.
Worked fine all last summer and this summer my check engine light came on after I had the dealership its annual maintenance.
Throws off code P1482.
Sometimes the fan works fine and cools the motor down to 200/190
usually the fan would kick in before 220 but now its going way past at 240.
Can't seem to solve why its doing this
I replaced the coolant cap and also the Coolant Temp Sensor. No avail.
I do recall that when we changed the module last year that the connector was a bit melted.
I'm wondering if I should just hard wire it
Any help with this is greatly appreciated as I'm at my wits end with this
Thanks
I'm desperate to solve this error code issue P1482.
Here are the details :
2007 Z06 LS7 motor 7 liter
Fully tuned with a Procharger, Boralla headers / exhaust, MSD
30k km
Last year my fan died and I replaced the fan, module, thermostat, all coolant with dexcool. All parts were GM parts.
Worked fine all last summer and this summer my check engine light came on after I had the dealership its annual maintenance.
Throws off code P1482.
Sometimes the fan works fine and cools the motor down to 200/190
usually the fan would kick in before 220 but now its going way past at 240.
Can't seem to solve why its doing this
I replaced the coolant cap and also the Coolant Temp Sensor. No avail.
I do recall that when we changed the module last year that the connector was a bit melted.
I'm wondering if I should just hard wire it
Any help with this is greatly appreciated as I'm at my wits end with this
Thanks
Cruising
Joined: Jun 2016
Posts: 10
Likes: 1
Hi Folks. I have read this thread with interest and tried a few of the fixes posted here but still having issues. Im new to this forum so forgive me if I posted this in the wrong section.
I'm desperate to solve this error code issue P1482.
Here are the details :
2007 Z06 LS7 motor 7 liter
Fully tuned with a Procharger, Boralla headers / exhaust, MSD
30k km
Last year my fan died and I replaced the fan, module, thermostat, all coolant with dexcool. All parts were GM parts.
Worked fine all last summer and this summer my check engine light came on after I had the dealership its annual maintenance.
Throws off code P1482.
Sometimes the fan works fine and cools the motor down to 200/190
usually the fan would kick in before 220 but now its going way past at 240.
Can't seem to solve why its doing this
I replaced the coolant cap and also the Coolant Temp Sensor. No avail.
I do recall that when we changed the module last year that the connector was a bit melted.
I'm wondering if I should just hard wire it
Any help with this is greatly appreciated as I'm at my wits end with this
Thanks
I'm desperate to solve this error code issue P1482.
Here are the details :
2007 Z06 LS7 motor 7 liter
Fully tuned with a Procharger, Boralla headers / exhaust, MSD
30k km
Last year my fan died and I replaced the fan, module, thermostat, all coolant with dexcool. All parts were GM parts.
Worked fine all last summer and this summer my check engine light came on after I had the dealership its annual maintenance.
Throws off code P1482.
Sometimes the fan works fine and cools the motor down to 200/190
usually the fan would kick in before 220 but now its going way past at 240.
Can't seem to solve why its doing this
I replaced the coolant cap and also the Coolant Temp Sensor. No avail.
I do recall that when we changed the module last year that the connector was a bit melted.
I'm wondering if I should just hard wire it
Any help with this is greatly appreciated as I'm at my wits end with this
Thanks
So finally figured it out.
Changed out the module which seemed fine but was warrantied so changed it as a precaution.
Hard wired the connection.
Works fine now. The connector was burnt inside and I suspect this was the source of the short
Navigator
Joined: Oct 2019
Posts: 9
Likes: 2
My fan connector was burned up.
I replaced the connector that worked for a bit but I am now getting the p1482 code. Guess I will try the module and confirm lingenfelter did not tune the fans to 100%.
Last edited by Deco foam; Nov 23, 2020 at 10:18 PM.