Truck was running and driving normally slowed down for a red light ahead hit the gas and the truck fell on its face. Got a F on the dash for the Transmission display, Reduced engine perfromance, zero power and enough throttle repose to limp back to the shop at 18-25 mph

Truck is definitely running rough will not shift and needed low range to get up a hill.

It will start then stall, start then stall, then run as above. No miss fire codes oddly but you can tell its down cylinders

The pertinent codes as I see it looking through the trash and ghosts are

P0102-00 (AA) Mass or volume air flow circuit low input
P2105-00 (AA) Throttle Actuator control system - Forced Engine shut down Circuit short to ground or Open
P0121-00 (AA) Throttle pedal Position Sensor A Circuit Range/Performance

U0100-87 (EB) Lost communication with engine control module/powertrain control Module A bus signal message failure
U0203-86 (AF) Control Module network signal calibration data - Bus signal message failure - signal is invalid
U0401-68 (2B) Invalid Data received from engine control module/powertrain control module - algorithm base failure

I tried swapping in a different throttle body and MAF that made not noteable chance in codes or the anger level of the truck when running

What are you guys thinking have you run into it before etc? Thanks in advance

 

I had someone with a faulty TPS have similar symptoms with the P0121 error code, it was a TDV6 where the TPS is on the acc pedal nothe engine as per petrol models. It would go into limp with any hard throttle action , after a restart it would drive fine if he was gentle on the throttle. Replaced the pedal and back to normal, unplug the TPS and see how it goes.

 

This one faults merely by turning on the key. No need to even start it. Clear the codes and it comes back immediately

 

Looking at the codes again, P2105 throttle actuator open to ground is your culprit as its forcing the shutdown.

 

Was my thought as well that is why I swapped throttle bodies but no change, I guess the next option would be swapping the gas pedal sensor. After that as I understand or don’t understand it means the pcm is likely faulted

 

How's the battery, alternator and ground strap connection to the body looking?

Those always throw a random assortment of errors when they aren't happy.

 

I think Loanrangie's right, that "short to ground or open" would be the first thing I would track down.

Have you put a multimeter on the TPS harness connector yet? It may not be an internal TPS fault, it could be a short to ground or open in the wiring harness or connector. Connectors can go bad and individual connection points can corrode or become loose. Harnesses can also become pinched and expose wiring. I would pull the wiring diagram and test all of the connectors for continuity. If you find an issue on the connector, you should check that it's the connector and not somewhere farther up in the wiring harness.

I have had loose harness / connector issues outside of the engine bay with my LR3, and I have had bad splice points in the engine bay of my Jaguar (same AJ V8 motor, just not bored out). Good luck with it!

 

I did a quick google and the responses suggest that it is likely not in the TPA itself but elsewhere in the wiring or the ECU.

 

battery is good alternator is charging and the ground in the fender well is clean

 

I’ll do some checking on the harness and see what turns up. It looks like if it’s the ECU, unfortunately that is likely a death sentence for the LR3.