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I just swapped to an aftermarket exhaust. The aftermarket also had its own AFM valves and I have them plugged in. Now I am getting a P26C8 code that keeps popping up. I read somewhere that the actuators are uniquely calibrated to the valves they get installed on and that doing an afm relearn procedure could fix my problem. Anyone else had issues like this before? Also Is it possible to do the afm cycle relearn on my own?
P26C8 is just the chassis control module requesting MIL illumination. You could have a non-AFM related problem. However, replacing the AFM valve does require a learn procedure. You will need to do this with a scan tool.
Those AFM valves are nothing but problems, especially if you track your car at all. They just fail/ actually melt and you get a code, I had the dealer replace one and after another track day I got that dreaded code again, problem is as I have learned here on CF that there are like 12 codes behind that P26C8 that sets it off. I did what FYRTEANT thread explains and bought the HP tuner and turned the AFM valves off. NO more codes thrown. Problem solved....
Just giving you an option if nothing else works for you, as I too cannot stand to have that CEL on.
Best of luck with yours
I been using my obd2 scanner it's been only showing me the P26C8 code. Is there a tool or software you use to see the other codes?
The reason I think it has to do with a problem with the afm valves. I can hear that its not closing and also I got the error after swapping my exhaust but maybe I did diconnect a hose or cable on accident.
You're best bet is to take it to a shop that does diagnostics or a mobile diagnostic service. Anyone with GDS2 (ideal) or a Launch, Snap-on, Autel, or Bosch diagnostic scanner should be able to do the AFM learn procedure.
I been using my obd2 scanner it's been only showing me the P26C8 code. Is there a tool or software you use to see the other codes?
The reason I think it has to do with a problem with the afm valves. I can hear that its not closing and also I got the error after swapping my exhaust but maybe I did diconnect a hose or cable on accident.
Yes there is HP tuner, with 3 credits required, when I plugged it in to read the CCM it showed a dozen codes that are all related to those AFM valves, The HP tuner let me disable them and I will never have to worry about them again, You are probably hearing like I to heard when mine failed is they don't close and flap around in the pipe. I too tried with my SCT scanner and it only showed the P26C8 code and no more, HP tuner is your friend for this fix, plus it has a barzillion other features to use as well.
Best of luck..........Nathan
I just swapped to an aftermarket exhaust. The aftermarket also had its own AFM valves and I have them plugged in. Now I am getting a P26C8 code that keeps popping up. I read somewhere that the actuators are uniquely calibrated to the valves they get installed on and that doing an afm relearn procedure could fix my problem. Anyone else had issues like this before? Also Is it possible to do the afm cycle relearn on my own?
Ok so I took my car in again because of an AFM actuator that won't program. I needed to replace them when I almost ran my car into a Ditch. So 1 took fine and the other did not. A while back I had a problem with them and Abel Chevrolet charged me $400 and replaced the wiring, didn't fix the problem, then said I needed new AFM valves and charged me another $300 to put them in, and still didn't fix the problem. I then took a torch and weekend the springs in the AFM valve and I fixed the problem. So now having to replace them again 1 took the other one didnt. I took it back to Abel Chevrolet and they charged me another $170 and didn't fix the problem. I have a code reader and it said the actuator that wouldn't program was on the right bank, so I switched it to the left bank, and now the right bank is good and the left is not. I took it to Winter Chevrolet to see if they would get it right, I told the guy what I found and why I think it is a bad actuator. He calls me today and says they put it in and it still won't program. So now I'll be out another $500 and still won't have the problem fixed. He made an excuse saying the exhaust is aftermarket,, which it is but I didn't have a problem before I had to replace them again. They are making an excuse to give up because the problem is way above their troubleshooting ability. Dealership mechanics are not longer mechanics, they have no troubleshooting skills, they are parts changers and all they do is replace the part the computer tells them to. I have an appointment at Abel Chevrolet again on the 13th but I know they won't get it right so I will have them do the oil change because that is about all they are really able to do. I hate laziness and people making excuses as to why they can't do their job. It's idiotic so I will yet again have to figure it out myself. Don't count on a dealership mechanic being able to troubleshoot and fix a complicated problem, they are not mechanics anymore. I've been working on cars since I was 8 when I would help my Dad, these guys can't wipe their a$$es without help anymore.
Here is the procedure for calibrating the CCM to recognize the flow control valve positions. There isn't a lot for a mechanic to do and if it doesn't work the only things that can fail are the CCM, the wiring between the CCM and the actuator or the actuator.
I would look for poor connections. Spray electrical contact cleaner on the connector pins and see if that helps.
Now I do know from personal experience that sometimes the calibration procedure doesn't always work on several subsystems. Sometimes the mechanic has to redo the procedure multiple times and sometimes a procedure may only take a few seconds to a few minutes to finish while other times the same procedure can take over an hour.
AFM duty cycle relearn help
