The Lemon IndexOne of the gas pedal position signals doesn't make sense.
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
Failing accelerator pedal sensor. Then: wiring fault.
Owners named P2121 in 7 complaints to the U.S. government, most often on the Ram pickup.
Cars owners report it on
Complaints that name P2121, by model. Raw counts, not a failure rate: popular models get more complaints.
The details
What P2121 means
One of the gas pedal position signals doesn't make sense.
Can I drive with P2121?
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
Common causes of P2121
- Failing accelerator pedal sensor
- Wiring fault
A shop should confirm the cause with a scan and tests before replacing parts.
Related codes
P2122 P2127 P2128 P2119 P2118 P2112 P2111 P2110
Quick answers
What does P2121 mean?
Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance. One of the gas pedal position signals doesn't make sense.
Can I drive with P2121?
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
What causes P2121?
Failing accelerator pedal sensor; Wiring fault.
Counts: NHTSA owner complaints whose text names P2121. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.