Q: p1120 out of service code

asked by on

I have been having issues with my car engine somtimes racing by it self and then settling down to normal.I had the throttle body replaced on the recommendation of a yourmechanic now the car is not shifting properly it somtimes will not shift out of first or second gear and the check engine light came on.the car ran fine for one day after he installed the new throttle body which actually is a used throttle body because they do not make throttle bodys for my car any more.It did it today on the way home it woul not shift out of second but after I drove the car for a while it was running normallyI took it to advance auto and got a scan.P1120 out of service.Can you help me.I can give more details if need be.
My car has 188000 miles.
My car has an automatic transmission.

Hi. The code P1120 is a problem with the throttle position sensor. The input from the throttle position was not what the computer expected and would cause the computer to go into a failure limp mode. When the computer is in this mode, you will have low power and transmission shifting will be harsh and erratic. This is normal for the computer, as it limits some operations during a major throttle position failure. You will have to replace the throttle sensor with a new one to ensure this problem is resolved. Used parts cannot be guaranteed to work, but if the part is no longer available through the dealer or aftermarket, then a used one is the only way to go. It is hit or miss on used parts. If you need further assistance, I recommend you have a certified technician, like one from YourMechanic, replace the throttle position sensor and inspect for other possible failing components on your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. p1120 out of service code

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: The car starts but the speedometer and brake lights and most electrical stuff won't turn on but the car runs

Hi there. It is highly likely that you have an accessory switch, relay or fuse that is damaged and causing these components to not work correctly. If you'd like, you can have one of our mobile mechanics come to your...

Q: My windshield wipers stopped working the motor seems to be working since when i turn them on you can hear a sound but they wont wi

Hi there. When the motor is working, but the windshield wipers do not move, the issue is typically caused by a broken wiper arm or perhaps one of the internal links inside the motor is broken. The best way to...

Q: Crank no start - 1997 Volkswagen Golf

Hello there. Many faults will cause your 1997 Volkswagen Golf to crank but not start. The most common fault is the battery. Once the battery has been load tested and ruled out, there are a few other likely faults, such...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...