Question about 1996 Jeep Grand Cherokee

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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.

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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.

Posted on Sep 06, 2010

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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

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

2 Answers

P0121 code in a 2000 dodge durango, will he TPS make the ransmission shift spuratically.


Yes..... The TPS can cause this!!! Another sign of a failing TPS is for the rpm's to fluctuate up and down by 100-300 as you drive down the interstate at a steady speed on a level surface.

Jun 22, 2010 | 2000 Dodge Durango

1 Answer

Get P0121 tps sensor what is this


TPS stands for throttle position sensor, this part is located on the side of the throttle body

What does that mean? 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.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebookcopyscape.gif 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

Feb 08, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Replaced tps, idles fine but dies after i give it gas and let off


take it to auto zone have them run there free test and see what is going on.

Aug 26, 2009 | Jeep Grand Cherokee Cars & Trucks

2 Answers

Engine dies


Sounds like its time for a tune up, new plug, wires, cap, rotor, fuel/air filter. Also have the timing checked. Could also be a fuel pump starting to go as well.

Aug 07, 2009 | 1995 Jeep Grand Cherokee

4 Answers

2002 Elantra P0121 code


well i saw your other post. try changing the TPS and see if that corrects it because that will screw up alot of stuff for your tranny.

Aug 13, 2008 | Hyundai Motor 2002 Elantra

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