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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-24-2009, 04:15 PM   #1
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Default P0121



Throttle Position (TP) sensor measures amount of throttle
opening. PCM uses TP sensor information for fuel delivery
calculations. TP sensor readings during acceleration are much higher
than those during deceleration or idle.

  • SES, Service Engine Soon light
  • Intermittent stumble on acceleration or deceleration
  • Blows black smoke on acceleration
  • No start
  • Defective TPS
  • Short in the TPS wiring.
  • Bad connection at the TPS
  • Water or corrosion in connector or sensor
Possible Solutions
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obd2, obdii, p0121, p121

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