01 with reduced engine power
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Heel & Toe
Joined: Apr 2021
Posts: 23
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From: Casa grande, AZ
01 with reduced engine power
I have codes p1120 p1220 p1516 no comm on tcs and abs and traction control lights I have replaced TPS sensor and still can't figure out what the hells going on it just started this after I was sitting at a light and go to take off on gr3n and then I just get ding ding ding reduced engine power pulled over and turn off turn on and erased codes then tried starting back up and it had reduced engine power before I could even start her up and I took her home and it's been about a month of frustration please somebody help !!!
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,643
Likes: 4,082
From: Cape Coral, Florida
First off do you have a decent scan tool to look at TPS voltages and some basic electrical knowledge ??...if the PCM sees the TPS voltages (1 and 2) less than 0.13 volts or more than 4.87 volts you will get the 1120 and 1220 DTC's...the 1516 is because of those 2 DTC's. I would check the power and ground on the TAC module...ignition power is pin 7 on the C2 connector and is a pink wire...pin 15 is a ground and is a black wire...the TAC module ground is G120 which is above the starter...you could have a bad TPS sensor because the 5 volt reference wire is not being pulled to ground through the sensor or maybe a bad ground on the TPS sensor which are the purple and white wires which are reference or computer grounds....hard to say....you can pull the 2 TAC module connectors and check for loose or corroded terminals...I'd be suspect of an aftermarket TPS sensor.
Last edited by C5 Diag; Apr 10, 2024 at 01:36 PM.
