p1518

[tomloans]

2003 Tahoe 5.3 with about 230k miles...All right folks. I have a p1518 code and after I erase it I just turned the key without starting and it'll hit me again it comes with the reduced engine mode. This is a new one for me after 22 years of owning this car. Any feedback would be great. Thank you

 

[Fless]

Tell us what you're working on -- year, make, model, engine, etc. Consider putting that in your signature so it's always there.

Sounds like a TAC module/wiring issue, but I'll let others chime in once we know the vehicle.

 

[tomloans]

Tell us what you're working on -- year, make, model, engine, etc. Consider putting that in your signature so it's always there.

Sounds like a TAC module/wiring issue, but I'll let others chime in once we know the vehicle.

2003 Tahoe 5.3 with about 230k miles... thank you. Bought new

 

[Fless]

See if @rockola1971 has any more to add than what is in this post:

Weird misfire in 2004 chevy tahoe

I have bought a 2004 chevy tahoe and it has missfire. I have changed all spark plugs, spark plug wires, O2 sensors, and knock sensors with their wire. I also cleaned the MAF sensor, throttle, intake manifold, and intake manifold sensor. All of my Injectors were tested and they work. What could...

www.tahoeyukonforum.com

 

[tomloans]

I have already changed out the harness many years ago. This is an odd code to get all by itself. And it seems severe. I literally just turn the key to the on position without starting the engine and the code and reduced engine power came back.