1516 and 1516Pd codes

mjoekingz28 · January 18, 2015

Hey GM tech, my truck ran ran fine for 250 miles with a blown CIG fuse. After replacing the fuse, i got down the road and was hit with a CEL, reuced power message and a 15-20mph top speed and a non-functioning throttle. Since then i have started the truck and it will idle fine and rev up when pressing the accelerator pedal and i have tugged on the yellow wire coming off the TB and it seems firmly affixed.

Any ideas rhat could help me?

Duelin · January 18, 2015

Double check your electrical system. Alternator, Battery, Battery Cables at both ends. Engine grounds.

gmtech4 · January 18, 2015

Duplicate thread , no need to do this Joseph .

Mods will lock it as it was answered already

mjoekingz28 · January 19, 2015

Amends ok is there a way to ckeck the tb electonics? Do i need a FSM to do so? I would like to be sure of it. Thanks

gmtech4 · January 19, 2015

Amends ok is there a way to ckeck the tb electonics? Do i need a FSM to do so? I would like to be sure of it. Thanks

Yes, you need a scanner and service information to follow the code and some experience ,

You can't reprogram it so just have this common problem diagnosed at a shop that CAN diagnose it and program

Sorry

mjoekingz28 · January 30, 2015

Google revealed it to be the Throttle Actuator Control (TAC). I have checked some grounds and replaced the broken strap from the hood to the firewall with copper wire.

As far as the alternator, when i went to get the truck the alternator was howling and the seller replaced it with a 105A from, i think he said a 350 truck, and it had the same harness plug but required some squishing of the mounting tabs to fit. It had a load of dust on the wound copper, so i used a paint brush to clean it up a bit.

A new TB is about $150

A new TAC is about $150 as well.