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P0120 Throttle Position Sensor

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Old 19 Oct 2017, 07:32 am
Fresh Cruiser
Join Date: May 2013
Location: Swindon, UK
Posts: 18
Default P0120 Throttle Position Sensor


After being serviced my 2003 2.2 diesel developed P0120

I've had the throttle position sensor replaced (crazy money...) but the code keeps coming back.

I've reset it and sometimes the EMS light stays off for 150miles, sometimes 5miles.

Other times the EMS light goes out by itself!

Any suggestions?

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Old 19 Oct 2017, 08:02 am
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Veteran Cruiser
Join Date: Jul 2016
Location: Darien, IL | Forest Park, IL
Posts: 3,567
Default Re: P0120 Throttle Position Sensor

I would suggest this is a wiring issue. There's only 3 wires. First to check would be the ground wire. Voltage high? Voltage low? The connector may require inspecting. The problem will be easier to find once the code is constant

Last edited by rob302; 19 Oct 2017 at 08:04 am.
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Old 19 Oct 2017, 11:25 am
Obsessed Cruiser
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,494
Default Re: P0120 Throttle Position Sensor

These are some of the common causes of P0120 on a 2.4L gas engine for a Pt Cruiser.

1. Sticking throttle return spring
2. MAP or TPS connector corrosion
3. Misrouted harness causing chafing
4. Bad TPS
If at First You Don't Succeed - Try, Try Again
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Old 22 Oct 2017, 08:30 am
Cool Cruiser
Join Date: Jun 2014
Location: southeastern PA
Posts: 370
Default Re: P0120 Throttle Position Sensor

I had the same repetitive code on a Neon. I ended up checking continuity of wiring between the TPS connector and the PCM (car's computer) connector. There was high resistance in the wire that feeds +5V to the TPS. I spliced in a new wire to bypass the bad wire, and that fixed it. Somewhere deep in the wiring loom is a broken wire.
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