Rear Intermittent Secondary efi Power vision code question

[jagonza1]

I have a 2003 Road glide fuel injected. I have a 103 long block  with se 257 cams thundermax 50mm throttle body S&S power-tune duels. I installed a power vision  with auto tune pro because my dealer couldn't get the motor to smooth out between 1800 and 2500 rpm and right at 3000 rpm's.

So I started tuning runs yesterday and have already seen improvements. I did two runs yesterday and three today.  The dealer left me with a gas mileage of 29 mpg and after running the power-vision it runs much smoother and I already have seen MPG move up to 37.

But today engine light came on. the power vision read the code Ecm:p1 intermittent rear efi.

Does anyone know what it means? I appreciative any input you may have.
Thank you
John A. Gonzales

[rigidthumper]

I believe that's referring to the Rear injector. Possible wiring issue, as they were known to be snug enough from the factory that the wire would break inside the insulation, ot at the pin, causing intermittent connection.