PCM failure!!!
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3rd Gear
Joined: Oct 2023
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PCM failure!!!
2016 3.5L F150 EB had intermittent 'limp' mode at 105000 miles, which caused dangerous throttle loss situations. Diagnosed with a PCM failure after receiving CEL P0505=IDLE CONTROL MALFUNCTION, P1124-TPA OUT OF SELF TEST RANGE, P2112=THROTTLE ACTUATOR A STUCK CLOSED. Anyone out there heard/dealt with such a thing? Any advice on stopping this from happening? $2500 diagnose, install, reprogram...
Lead Driver
Joined: Sep 2006
Posts: 7,907
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All the codes point to a faulty Throttle Body.
The code 505 is telling you the engine is put into Limp mode.
That is so the fault can't run away with you while driving.
You would not want it any other way.
I would strongly consider replacing it.
Good luck.
The code 505 is telling you the engine is put into Limp mode.
That is so the fault can't run away with you while driving.
You would not want it any other way.
I would strongly consider replacing it.
Good luck.
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3rd Gear
Joined: Oct 2023
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Thanks for the heads up. Mechanic sourced it back to PCM. He actually did a really wild job according to his description of diagnosis and explanation of testing the 6pin. I had ordered a tb prior to having the shop test voltage, but the PCM also had a fault according to his testing and showed no issue with the tb. Will be replacing with the Hitachi, since I have read that wider aftermarket really doesnt give much performance or gains. Its sitting on my kitchen counter awaiting the new PCM to be programmed. My worry was that the old tb or another component would short the circuit again and damage the PCM, but was told everything should be good to go. I have not heard or read of many others with this problem yet. Makes me wonder if turbo heat could create excess and damage the circuit board? Not my specialty.
Logistics Pro
Joined: Jun 2017
Posts: 3,987
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From: Edmond, OK
Sounds like malarkey to me. I would have started by replacing that throttle body.
There are probably a dozen ECMs on our modern trucks. If you have one sitting on your kitchen table don't disassemble it. I used an ESD bracelet when I replaced the ECM in a 93 Buick LeSabre I owned. Nowadays all the computers in cars are 100% solid state which means they're that much more susceptible to ESD. I hope the shotgun parts replacement that technician does fixes your problem.🤞
There are probably a dozen ECMs on our modern trucks. If you have one sitting on your kitchen table don't disassemble it. I used an ESD bracelet when I replaced the ECM in a 93 Buick LeSabre I owned. Nowadays all the computers in cars are 100% solid state which means they're that much more susceptible to ESD. I hope the shotgun parts replacement that technician does fixes your problem.🤞
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3rd Gear
Joined: Oct 2023
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When I went in to replace the throttle body I found mouse damage on wiring harnesses. The tech indicated he had not seen the damage, but had diagnosed the PCM. Insurance took care of me. With a new PCM, it still pointed at the old throttle body as an issue. Replaced it. No problem for the last 15k. Needless to say the tech does not work at the shop anymore due to other apparent issues, he did write up a very good pin procedure for PCM diagnosis, whether that was fact and done is another story.
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