CODE P0122 COMES ON ONLY WHEN I SHIFT TRANS

  • Tiny
  • Anonymous
  • 2001 Dodge Caravan
  • 173,000 miles

Code P0122 comes on only when I shift trans. Into drive. Runs and shifts fine, but shifts in and out of lock-up with slightest throttle change.

Monday, November 26th, 2012 AT 2:52 AM

1 Answer

  • Tiny
  • caradiodoc
  • Expert
  • 24,980 posts

P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input

That suggests a break in the 5.0 volt feed wire to the throttle position sensor. Check the connector for stretched or corroded terminals or a break in the 5.0 volt wire. That would be a lot more common than a defective sensor.

The additional dandy clue about the lockup torque converter can be caused by dirt in the throttle position sensor, but that code should be "voltage high". I never like to replace parts until a proper diagnosis confirms they're bad, but in this case, if you don't see a wiring problem, you may want to try a new TPS. First wiggle the wiring harness with the transmission still in park while a helper watches to see if the Check Engine light comes on. If you have a scanner you can also watch the TPS volts to see what causes the voltage to change when you wiggle wire harnesses.

Was this
answer
helpful?
Yes
No
Monday, November 26th, 2012 AT 8:11 PM

Please login or register to post a reply.

Similar Questions