2012 showing a P2609

[OggyOggy]

Anyone have experience dealing with the P2609? I searched the forum and saw a couple threads but none showed a resolved problem.
I have the Banks Monster intake which replaced the failure prone stock grid heater with a coil type. With that said, I've replaced the relay and coil heater. The error went away for 2 weeks and has returned.
Any ideas out there?
Thanks

 

[PRS]

According to Mitchell DIY, the PCM is looking for a specific voltage drop when the heat relay is activated. Any poor connection, such as ground or battery cables, could lower the current flow and make the voltage drop smaller.

 

[sag2]

Are you sure the heater supplied with the Banks kit is operating? If it doesn't see a voltage drop at key on preheat it will set the code.