P2122: Throttle/Pedal Position Sensor/Switch D Circuit Low
What Does P2122 Mean?
P2122 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch D Circuit Low. This code relates to the powertrain system. It has been reported in NHTSA complaints across 11 different vehicle models.
Symptoms of P2122
- ⚠️ Check engine light illuminated
- ⚠️ Engine misfires
- ⚠️ Loss of engine power
- ⚠️ Traction control system activated
- ⚠️ Vehicle enters limp/reduced power mode
- ⚠️ Steering issues
Common Causes
- 🔍 Faulty oxygen sensor
- 🔍 Clogged or leaking fuel injector
- 🔍 Throttle body or throttle position sensor issue
- 🔍 Wiring or connector problem
- 🔍 EVAP system component failure
- 🔍 Sensor or control module malfunction
P2122 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Driving along and Reduced Engine Power warning message came on said can not go above 20 mph but yet car still could be accelerated above 20mph. Pulled over when could. Stopped car and turned it off and on. message gone but engine warning light still on. OBD2 stated P2122 error. Upon reviewing i"
— Chevrolet Malibu owner, 02/10/2022
"SEVERAL TIMES A WEEK MY CAR WILL SUDDENLY GO INTO "ENGINE POWER REDUCED" MODE AND GO INTO LOW SPEED. IF I GET OUT OF THE CAR, LOCK IT, AND UNLOCK IT 30 SECONDS LATER IT WILL RESET AND THEN BE OKAY FOR A FEW MINUTES. THIS POWER REDUCTION IS EXCEEDINGLY DANGEROUS WHEN MOVING AT HIGHWAY SPEEDS AND SUDD"
— Chevrolet Malibu owner, 01/01/2021
"Check engine light came on. Display stated that the engine will run at reduced power which meant we had to Limp home at 15 MPH which put us in a dangerous situation. I read the code and it was P2122. Throttle/Pedal Position Sensor/Switch “D” Circuit Low Input. This indicates that there is a problem "
— Chevrolet Malibu owner, 10/22/2023
Source: NHTSA Complaints Database
Most Reported Vehicles for P2122
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | CHEVROLET IMPALA | |
| 2 | CHEVROLET MALIBU | |
| 3 | JEEP RENEGADE | |
| 4 | DODGE DART | |
| 5 | JEEP CHEROKEE | |
| 6 | CHEVROLET TRAVERSE | |
| 7 | CHEVROLET COLORADO | |
| 8 | HYUNDAI SONATA | |
| 9 | DODGE DURANGO | |
| 10 | GMC ACADIA | |
| 11 | GMC YUKON |
P2122 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
Can I drive with this code?
Will this code clear itself?
How do I find the exact cause?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Check and tighten the gas cap — replace if cracked or damaged ($5-15)
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Inspect wiring harness and connectors for damage, corrosion, or loose connections
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
-
1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
-
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
-
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.