AEM v1 sync errors & looses sync tooth


New Member
Sep 3, 2015
I have been dealing with this issue for a couple of weeks now and at a loss and just out of ideas as to what to do/ look for.

I am incountering cam sync error with the AEM V1. While the car is idleing there are no errors and the AEM doesnt drop the sync tooth. I have narrowed it down to being the cam signal as when logging the crank signal is fine. I have replaced the shielded wire loom going to the cps and grounded the shield at the ecu side. This didn't change the situation.

What i see on the AEM is that at random rpms and load levels the ems encounters a sync error and the sync tooth drops to zero for a split second then it finds it again and returns to its original value. I don't think it is the cps as it works fine the majority of the time.

If anyone has any ideas, im open to them.


Grease Monkey
Jul 3, 2009
I am going to assume 7MGT.

Take the CPS apart and clean it out inside, make sure oil isn't getting into it and that the shaft isn't wobbly. (you might need to replace the seal and bearing).

Check the clearances on both pickups as per the TSRM. You want these on the tight end of the range.