Question about 2004 Dodge Ram 1500

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P0121 code poor milage headlight short - 2004 Dodge Ram 1500

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Maybe the "safety" relay is shorted or bad. My 04 Ram 1500 has a relay that will leave the lights on for about a minute after you turn off the truck ONLY if you shut the truck off with the light switch in the on position. you could have a short to that relay causing it to randomly turn on your lights. Try shutting the truck off with the headlights on and cycle the switch from off to on to off again, that will over-ride the relay. if they stay on, I'd bet thats the problem.

Posted on Nov 21, 2008

P0121 is throttle position sensor/switch A circuit range/performance problem...

you need a new throttle position sensor, like $50 at autozone. you unplug an electrical connector, unscrew 2 hex screws, put the new one on and redo the two screws and electrical connector... DONE

Posted on Aug 23, 2008

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I replaced the TPS. It seems to be running better, but too soon to tell. The code has cleared. In town mileage is up a little. And I have not smelled the odd exhaust, rich fuel smell again. My truck has 144,500 miles.

So, why my lights come on(high beam) for no reason when the truck is turned off and with the switch is turned off is still a mystery, unless the short in the TPS was causing it. When you start the truck and drive a few seconds the lights would go off??? Like I said too early to tell on that part. It had been raining the night this happened, so I don't know if I have another shorted wire somewhere??

Posted on Aug 03, 2008

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2003 sta fe hyundai give code 121


P0121 HYUNDAI - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

Possible causes - Faulty throttle position sensor - Throttle position sensor harness is open or shorted - Throttle position sensor circuit poor electrical connection - Faulty Engine Control Module (ECM) What does this mean? When is the code detected? Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) P0121 Hyundai Description The throttle position sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM. Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

Nov 20, 2016 | Hyundai Cars & Trucks

1 Answer

2003 spectra 0121 code


DTC P0121: Throttle/pedal position sensor A circuit range/performance. Probable cause:
1. Faulty sensor
2. Damaged or corroded connector terminal contact
3. Wire harness fault. Check for correct voltage, open, short to ground, short to voltage
4. Control unit software in need of updating
5. Faulty PCM or ECM

Sep 02, 2014 | 2003 Kia Spectra

2 Answers

P0222 and p0121 troubleshooting


FIRST AND FORMOST do not listen to any advice the totally unqualified parts guys hand out at Autozone or any other free code reader parts store, they want to sell you parts and that is all.

P0222 VOLKSWAGEN - Throttle Pedal Position Sensor/Switch 'B' Circuit Low
Possible causes- Throttle position sensor harness is open or shorted
- Throttle position sensor poor electrical connection
- Faulty Throttle position sensor
When is the code detected?An excessively low voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

P0121 VOLKSWAGEN - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance
Possible causes- Faulty throttle position sensor
- Throttle position sensor harness is open or shorted
- Throttle position sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM) When is the code detected?Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

Have the VW dealer complete the diagnosis on this.

Nov 05, 2012 | Cars & Trucks

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

2004 jeep grand Cherokee 4.7 ltr ho code p0121


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 ths helps; keep us updated.

Sep 20, 2011 | 2004 Jeep Grand Cherokee

1 Answer

P0121 and p0068 on a 2003 dodge ram 1500 replace the throttle position sensor and the idle air sensor at the same time then ran for a week with no problems then the truck started idling up at random then...


P0121 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 oscilloscope. 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 oscilloscope 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.
P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
- Dirty throttle body
When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings
P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

Jun 05, 2011 | Dodge Ram 1500 Cars & Trucks

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

My 2004 Grand Cherokee is displaying the P0121 engine code, TPS, would this cause it not to shift into O/D. When I was driving on the hwy, it won't shift into O/D.


Yes.
The TPS is thottle position sensor. This is a key data source for the Engine Control Unit adjusting the fuel injection and the ignition.
Failed sensors will put the system into a "limp home" mode. It runs, but all of the fine control used to make maximum power and maximum gas milage is turned off. You should get this fixed.

Sep 05, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Backfire, rough idle, poor fuel milage


likely it is the computer check your codes

Jan 02, 2010 | 1996 Plymouth Neon

1 Answer

Poor gas milage


Gas milage will vary, depending on the manner in which you drive, also poor gas milage could be due to poor maintenance. Replace the PCV valve, the oxygen sensors, the fuel filter, plugs and wires, and have the injectors cleaned, switch to synthetic oil should improve the milage. .

Jun 29, 2009 | 1991 Toyota Pickup

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