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P0121 Diagnostic Trouble Code Discussion for May 2015

Throttle Position Sensor Does Not Agree With MAP

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Trouble Ticket Help Requests for DTC P0121
Help Request Posted
2004 Chevrolet Epica LS 2.5L Poor Idle Quality, Stall VIN: KL1VB52L44
P0121: Throttle position A circuit range/performance. ... looking into this Epica for high idle issues and occasional stalling. I drove the car and noticed that as soon as it was put in gear the idle would jump to about 1300-1400 RPM. It also bumps the Rpms on decel at the trans shift points. Put the car back in ...
May 13, 2015
2002 Jeep Grand Cherokee Laredo 4.0L MIL Lamp on VIN: 1J4GX48S42
P0121: Throttle Position Sensor Performance. Ok, This Jeep came into the shop with a complaint of hesitation, cruise not working and mil on. Pulled the codes and started testing tps. Looking on IATN, I found that there were numerous posts about the clock spring. I checked and sure enough, I had 5 volts o...
May 27, 2015