Question about 2001 Dodge Durango

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My check engine light is on. The code is P0121

My check engine light is on. The code is P0121 but I can't remember where to go to see what that code means.

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Where is the throttle position sensor switch located on a 2001 dodge durango?

Posted on Sep 07, 2009

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I believe all the Mopar OBDC codes are the same. A list of the 2001 codes were posted on a PT Cruiser site here: 2001 Chrysler codes

Your error says the throttle position sensor and MAP sensor disagree with each other

Posted on Jun 22, 2009

  • shane hill May 25, 2013

    how do u fix this?

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I had a code P0121. I bought the sensor and had it replaced, now the code still won't clear. I need an inspection ASAP but the check engine light is still on.


I should start by saying a trouble code does not mean a component must be replaced. It only means the signal from the sensor is out of range or the affected circuit needs to be checked out.
Code 121 means the signal from the TPS is either out of range or not where the computer thinks it should be. Such as the TPS tells the computer the throttle is closed when it is actually open.
You would need to use a scanner to see the data coming from the sensor to tell if it is working or not. The problem could be the throttle or the wiring back to the computer.

Feb 11, 2014 | Saturn Ion Cars & Trucks

1 Answer

My battery died, I replaced it and now I get only Error Codes P0121 and P0573. The vehicle does not act like anything is wrong in either case...Throttle works just fine...and I don't have cruise control....


P0121 is : throttle / pedal position sensor/switch A circuit range/performance problem
P0573 is : cruise control /brake switch A circuit high
first check : there is two switch on brake pedal linkage one for brake light and the second with rubber hose for cruise control
try to push switch toward brake pedal to ajust
tps code P0121 check for wires if they are cut
hope it helps

Oct 05, 2013 | Pontiac Cars & Trucks

1 Answer

How do I fix codes p0551 and p0121 within dodge durango 2000 slt


go buy auto zone and have them erase these codes they willd do this for free

Sep 06, 2012 | 2000 Dodge Durango

2 Answers

Keep getting OBD code P0121 on my 98 grand prix GTP


Hi there:

DTC P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem


The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.





Symptoms of a P0121 trouble code could include:
* Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
* Intermittent stumble on acceleration or deceleration
* Blows black smoke on acceleration
* No start




A code P0121 may mean that one or more of the following has happened:
* TPS has intermittent open or short internally
* Harness is rubbing and causing an open or short in the wiring
* Bad connection at the TPS
* Bad PCM (less likely)
* Water or corrosion in connector or sensor





Possible Solutions:
1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jun 20, 2012 | 1998 Pontiac Grand Prix

1 Answer

I have a 2004 Jeep grand cherokee straight six. I replaced the TPS sensor & IAC sensor. recently experienced high idle while in park, lack of power, and engine light came on with a code of P0121? ...


Depending on the system, P0121 is Throttle/pedal position sensor/switch A circuit range/ performance problem.

Did the TPS have slotted mounting holes? If so it may need to be adjusted.

Sep 04, 2011 | 1996 Jeep Grand Cherokee

3 Answers

P0121 generic throttle/pedal position sensor a circuit range/ performance


P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem

The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.

Potential Symptoms: Symptoms of a P0121 trouble code could include:
Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
Intermittent stumble on acceleration or deceleration
Blows black smoke on acceleration
No start

Causes: A code P0121 may mean that one or more of the following has happened:
TPS has intermittent open or short internally
Harness is rubbing and causing an open or short in the wiring
Bad connection at the TPS
Bad PCM (less likely)
Water or corrosion in connector or sensor

Possible Solutions:
1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.

Other TPS sensor and circuit related DTCs: P0120, P0122, P0123, P0124

May 01, 2011 | Volkswagen New Beetle Cars & Trucks

1 Answer

97 buick riviera check engine light


The code is for the TPS , several things can cause this tps not plugged in , or plugged in after the car was started. If the car runs good go to auto zone let them erase the code for free with their scanner and then see if it comes back on. most likely it was just a accident. but go check to make sure it is plugged in and that the wires to it are not pinched in any way.

May 28, 2009 | 1997 Buick Riviera

1 Answer

1998 Jeep Wrangler Sport codes P0121 and P0122


did you check voltage to sensors if you need help with proedure, contact me, or you may try patrs houses on line in how to section.

Oct 04, 2008 | 1992 Jeep Wrangler

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