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Old 02-13-2022, 07:26 PM
Hog_runner Hog_runner is offline
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Join Date: Jan 2018
Posts: 20
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Hog_runner Hog_runner is offline
Junior Member
 
Join Date: Jan 2018
Posts: 20
Hog_runner is on a distinguished road
'05 V8 Throttle Position Sensor Codes - Won't Start?

A couple of weeks ago I was in a bind and had a shop replace my starter. They snapped the wires at the connector for one of my knock sensors so I went under and repaired that myself. So after that job I thought damn, I need to clean this engine bay up. Well, I did, and now I can't get to start. Been digging on the forums all day and can't find anything so I'd appreciate y'alls input.

Symptoms:
  • The truck turns over but gives up after the 3-4 second "auto" start.
  • P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
  • P0123 Throttle/Pedal Position Sensor/Switch A Circuit High
  • P2135 Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
My hunch is that I fried the throttle position sensor while cleaning my engine bay. According to DTC codes and referencing FSM (2006 ed.), looks like my options are replace the Throttle Body (to replace the throttle position sensor which is integrated to the TB), or replace the ECM if in actuality that is my problem. I think the ECM is fine though based on my ability to get readings thru my OBD scanner? I guess I'm confused why the car won't start even if the TB/Position Sensor is shorted/open/otherwise fried. I've been racking my brain all day. The FSM mentions a fail-safe mode if the throttle pos. sensor is out that would allow the truck to run in "limp mode" as I've seen it referenced here before. I guess maybe the intake could be out of sync and therefore not getting the correct air/fuel mixture?

Additional info/things I've tried:
  • charged battery
  • opened fuel cap, reinstalled
  • disconnected battery overnight
  • confirmed throttle body opens when accelorator is depressed
  • MAF picks up signal when air blown manually
  • ECM registers throttle opening position (thru OBD scanner)
  • I have gas
  • No blown fuses
I have not checked fuel delivery since I'm getting codes related to intake/throttle.

Last edited by Hog_runner; 02-14-2022 at 11:02 AM. Reason: To get more traction
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