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2007 cheverolet tahoe code-0121 throttle position sensor1 performance

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Posted on Jan 02, 2017

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SOURCE: Throttle/Pedal Position Sensor/Switch B Circuit Range Performance

buy manual, use ohm meter,  adjust tps 

Posted on Sep 13, 2009

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SOURCE: Where is the pedal sensor for a gmc yukon 2007

P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
that is a drive by wire system the gas pedal has a sensor rigt above it make sure the plug is all the way in or the sensor could have a glicth in it and would have to be replaced

Posted on Mar 25, 2010

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SOURCE: I have a 2007 Chevy

If it is a code P0226 I would not consider it a safety issue.

Throttle position (TP) sensor C/accelerator pedal

position (APP) sensor ? - range/performance problem

Possible Causes: Accelerator cable adjustment, TP/APP sensor

Throttle position (TP) switch C/accelerator pedal position

(APP) switch ? - range/performance problem
Accelerator cable adjustment, TP/APP switch

This might only be an adjustment issue--make sure the throttle cable isn't so tight that the throttle cannot fully close.
If the cable is OK, it is probably the accelerator position sensor under the pedal.
There are procedures for testing the unit that I will paste below if you care to try them.

If you just want a shop to fix it, the part is about $50 and labor should only be 30 minutes.

Operation The sensor is made up of the two individual sensors within a single housing. Each sensor has a unique functionality to determine pedal position. The APP system along with the Powertrain Control Module (PCM) is used to calculate and control the amount of acceleration and deceleration through fuel injector control.

Removal & Installation

  1. Remove the driver-s side knee bolster.
  2. Push down on the small tab and disengage the electrical connector.
  3. Remove the pedal bolts and remove the pedal and sensor assembly.
  4. Installation is the reverse of removal.


Fig. APP sensor mounting

  1. Install a 3 amp fused jumper wire between the 5-volt reference terminal of the APP sensor and 5 volts. Install a jumper wire between the low reference terminal and a ground.
  2. Sweep the sensor through the entire range while monitoring the voltage between the signal terminal and the low reference terminal with a digital multimeter. The voltage should vary between 0.30-4.98 volts without any spikes or dropouts.
  3. If the voltage is not within the specified range or is erratic, replace the accelerator pedal assembly.

Posted on Oct 06, 2010

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that is a drive by wire system the gas pedal has a sensor rigt above it make sure the plug is all the way in or the sensor could have a glicth in it and would have to be replaced

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