P2122 on CHEVROLET IMPALA — Throttle/Pedal Position Sensor/Switch D Circuit Low

Q: "What does P2122 mean on a CHEVROLET IMPALA?"

"P2122 indicates: Throttle/Pedal Position Sensor/Switch D Circuit Low. This is a powertrain code. 8 CHEVROLET IMPALA owners have reported this to NHTSA."

Q: "What are the most common causes of P2122 on CHEVROLET IMPALA?"

"Based on 8 NHTSA reports, the most commonly cited components are: Engine, Vehicle Speed Control,Electronic Stability Control (Esc),Engine, Engine And Engine Cooling,Electrical System,Vehicle Speed Control. These percentages are based on the component field in owner complaints."

Q: "Is P2122 serious on my CHEVROLET IMPALA?"

"Of 8 NHTSA reports for this code on CHEVROLET IMPALA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my CHEVROLET IMPALA shows P2122?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P2122 Means on Your CHEVROLET IMPALA

P2122 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch D Circuit Low. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

8 CHEVROLET IMPALA owners have reported this issue to NHTSA across model years 2009-2012. Most reports come from the 2009, 2010 model years.

Real CHEVROLET IMPALA Owner Reports

Source: NHTSA Complaints Database

"Vehicle serviced by firestone complete auto care, november, december 2016 vehicle was in motion, on a city street vehicle exhibited reduced engine power, ran rough, triggered engine error alarm."

— 2009 CHEVROLET IMPALA owner · ENGINE · Filed 11/29/2016

"My name is [xxx] and i purchased a 2009 chevy impala, with 123,000 miles on it, in august 2015 from mac churchill auto mall in bedford, texas. i have had no problems with this car since its purchase until november 29th."

— 2009 CHEVROLET IMPALA owner · VEHICLE SPEED CONTROL,ELECTRONIC STABILITY CONTROL (ESC),ENGINE · Filed 11/29/2015

"I-40 east bound; 60 mph; coming down a 4 to 7% grade through the smokey mountains, north carolina side; 1st error: "service traction control, reduced engine power, service engine. approximately 5 minutes later 2nd error: "starting disable,service throttle" lost all power to vehicle."

— 2009 CHEVROLET IMPALA owner · ENGINE AND ENGINE COOLING,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL · Filed 04/27/2012

"Service stabilitrak message displayed and reduced engine power to 0 mph while driving. Throttle body, Accelerator pedal position sensor (whole pedal assembly), and ecm replaced. Issue continues. P2138, P2122, P2127 codes present. Stonebriar chevrolet incompetent to resolve."

— 2010 CHEVROLET IMPALA owner · POWER TRAIN,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL · Filed 08/15/2021

"The diagnostic revealed that there are 11 codes in the vehicle system. these codes ranged from passkey system failures to evap codes to transmission. suspected failure of wiring harness altogether with possible bcm/cam failure as well."

— 2010 CHEVROLET IMPALA owner · ELECTRICAL SYSTEM,ELECTRONIC STABILITY CONTROL (ESC),ENGINE · Filed 07/22/2020

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

3

'09

2

'10

2

'11

1

'12

Common Causes on CHEVROLET IMPALA

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 25%

VEHICLE SPEED CONTROL,ELECTRONIC STABILITY CONTROL (ESC),ENGINE 12.5%

ENGINE and ENGINE COOLING,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL 12.5%

POWER TRAIN,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL 12.5%

ELECTRICAL SYSTEM,ELECTRONIC STABILITY CONTROL (ESC),ENGINE 12.5%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P2122 mean on a CHEVROLET IMPALA? ▾

P2122 indicates: Throttle/Pedal Position Sensor/Switch D Circuit Low. This is a powertrain code. 8 CHEVROLET IMPALA owners have reported this to NHTSA.

What are the most common causes of P2122 on CHEVROLET IMPALA? ▾

Based on 8 NHTSA reports, the most commonly cited components are: Engine, Vehicle Speed Control,Electronic Stability Control (Esc),Engine, Engine And Engine Cooling,Electrical System,Vehicle Speed Control. These percentages are based on the component field in owner complaints.

Is P2122 serious on my CHEVROLET IMPALA? ▾

Of 8 NHTSA reports for this code on CHEVROLET IMPALA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my CHEVROLET IMPALA shows P2122? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.