GMH94Z28

Today i installed a harlan shift light and it works great, But after i installed it my service engine light came on. I ran free scan on it and the error is MALF 42: EST Ground. I connected the green shift light tach wire to the white wire on the pcm. When i disconnect it my service engine light doesnt come on.Does anyone know anything about this? Thanks

GetaZforgetGT

Did you use the one by the OBDII plug under the dash or did you route it out to the ECU?

If you used a good splice connector you should have been fine.

GMH94Z28

I used the the white wire from the pcm and spliced into it with a wire tap. Thanks

Formula_one

Why not use a wire off of the coil? I had an MSD shift light in my old car and that's what I used. I'm unsure if the Harlan is any different, though.
Mine was just a ground, power and signal wire...

GMH94Z28

Does anyone else know where i can tap into for the shift light tach wire?

Formula_one

I used the white wire the comes off the coil.