Throttle/pedal Position Sensor/Switch A Circuit low

Did you do all the above with the jumper cable on there?

Looking like its the APPS....

Have you tried resetting it?

Yes.
Not lately, but I will. Could the APPS cause other codes and symptoms like this?

It shouldnt - but resetting the APPS is free....while you are doing it, clean up your battery terminals to make sur eyou are getting good connections.

Clean all the paint off your ground wires you need a medal to medal connection

Heres the quick and dirty reset procedure:

1. Set parking brake
2. Disconnect negative battery cables on both batteries
3. Turn ignition key to run(to drain any remaining capacitors)
4. Let truck sit for 30 minutes( this is the recommended minimum)
5. Return ignition to OFF position
6. Reconnect both batteries and secure, not a timed event
7. Turn key to run position(not start) and depress accelerator pedal slowly all the way to the floor
8. Allow pedal to return to top position slowly
9. Turn ignition switch OFF
10.Release parking brake


Here the long way around:

Many have found that correcting the output voltage from the APPS sent to the PCM has increased the throttle response, and boost. This calibration also adjusts the APPS for wear.

Tools: Digital Volt Meter, T-20 Torx bit, #1 phillips, 10mm socket

With the key on, engine off you need to probe the APPS wire to see where the voltage is currently set at.
The best location to probe the wire is on the PCM (Power Control Module) which is located on the passenger firewall behind the air intake.
You want the C1 connector, this is the connector closest to the engine
You want the orange wire with a dark blue tracer which is pin #23 (Please use a suitable backprobing adapter for your meter lead, do not pierce the insulation as this can lead to water intrustion/corrosion.)
Voltage should be somewhere around 0.5 volts,
At this point the voltage reading does not matter, it just has to be accurately written down for later reference

TURN THE IGNITION OFF ON THE TRUCK

Remove the black plastic cover off of your APPS. There are two plastic screws. One on the top and one on the front facing the radiator. It takes a little prying to pull it off.

Undo the 6-10mm bolts that hold the bracketry in place but DO NOT REMOVE THE CABLES!!

You will notice the APPS is on the back of the bracketry that you just removed, it is held in place by 2-T20 torx bit screws. These screws have a little bit of locktite on them so make sure you have a good socket and gently give a little tap with a hammer before attempting to loosen. Be very careful because these screws strip VERY easily and you only get one shot at them (VERY VERY VERY IMPORTANT; They are VERY tight).

On the APPS you will find a white tag that gives you the information on what the APPS voltage should be.
After loosening the screws (do not remove) you can rotate the APPS clockwise or counter clockwise to get the adjustment (towards the front of the truck increases voltage and towards the rear of the truck decreases voltage)
The reading you took at the beginning of the process on pin #23 should match the white tag on your APPS. If it doesn't the adjust accordingly.

:nice:

Show off....

I did the quick and dirty reset. I have Optima red tops, and the connections are clean. All the grounds have clean solid metal to metal connections. Truck started and ran good. Checked the codes at the end of a 4 mile trip, and there were none. ?????

Take the cable off and see if it throws codes

If its running good - dont bother taking the cable off - drive it and check for codes later.