P2138 on SUBARU IMPREZA — Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

Q: "What does P2138 mean on a SUBARU IMPREZA?"

"P2138 indicates: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation. This is a powertrain code. 3 SUBARU IMPREZA owners have reported this to NHTSA."

Q: "What are the most common causes of P2138 on SUBARU IMPREZA?"

"Based on 3 NHTSA reports, the most commonly cited components are: Fuel System, Gasoline,Electrical System,Vehicle Speed Control, Vehicle Speed Control. These percentages are based on the component field in owner complaints."

Q: "Is P2138 serious on my SUBARU IMPREZA?"

"Of 3 NHTSA reports for this code on SUBARU IMPREZA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my SUBARU IMPREZA shows P2138?"

"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 P2138 Means on Your SUBARU IMPREZA

P2138 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 SUBARU IMPREZA owners have reported this issue to NHTSA across model years 2012-2013. Most reports come from the 2012, 2013 model years. The most commonly reported component is Fuel System, Gasoline,Electrical System,Vehicle Speed Control (66.7% of reports).

Real SUBARU IMPREZA Owner Reports

Source: NHTSA Complaints Database

"Driving about 30 - 35mph when all of a sudden the car lost power. the car did not stall, but engine went down to idle speed and my accelerator pedal had no throttle control. the "check engine " light came on as well as the "traction control" light."

— 2012 SUBARU IMPREZA owner · FUEL SYSTEM, GASOLINE,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL · Filed 08/02/2013

"While driving in normal circumstances, engine power was lost, and complete loss of throttle control occurred. car would accelerate extremely slowly, and not past 20-25 mph (presumably 'engine fail-safe mode'?). thankfully not on a high-speed road."

— 2012 SUBARU IMPREZA owner · FUEL SYSTEM, GASOLINE,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL · Filed 09/12/2012

"Car throws a p2138 code and car goes in limp mode with the accelerator pedal non-responsive. have to pull over and reset ecu to get back on road. have replaced accelerator pedal, throttle body, relay, and ecm at subaru dealership. happened dozens of times."

— 2013 SUBARU IMPREZA owner · VEHICLE SPEED CONTROL · Filed 12/07/2019

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

📊 Complaint Trend by Model Year

2

'12

1

'13

Common Causes on SUBARU IMPREZA

Based on NHTSA complaint component analysis for this vehicle.

FUEL SYSTEM, GASOLINE,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL 66.7%

VEHICLE SPEED CONTROL 33.3%

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 P2138 mean on a SUBARU IMPREZA? ▾

P2138 indicates: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation. This is a powertrain code. 3 SUBARU IMPREZA owners have reported this to NHTSA.

What are the most common causes of P2138 on SUBARU IMPREZA? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Fuel System, Gasoline,Electrical System,Vehicle Speed Control, Vehicle Speed Control. These percentages are based on the component field in owner complaints.

Is P2138 serious on my SUBARU IMPREZA? ▾

Of 3 NHTSA reports for this code on SUBARU IMPREZA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my SUBARU IMPREZA shows P2138? ▾

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.