P2138 on Subaru vehicles
106 owner complaints filed with NHTSA about Subaru vehicles mention P2138 (Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation) - across 7 models. Below is where it shows up, by model and year.
Can you drive with it? Drive gently to a shop - reduced power mode is normal with this fault.
Symptoms, likely causes in order and realistic repair costs are on the main P2138 page - they do not differ much by brand. This page shows what is specific to Subaru: which models and years actually report it.
Subaru models reporting P2138
The number next to each year is how many NHTSA complaints for that car mention P2138. Owners rarely quote trouble codes when complaining, so real occurrence is many times higher - use these numbers to compare years, not as totals.
What Subaru owners report
“P2138 code. Gas pedal stops responding to inputs. Car goes into limp mode and managed to get car off the road. Shut off and waited 5 minutes, restarted and it works again. Associated P0500 code also present. First time this has happened on this car.”2005 Subaru Outback · Mar 2026
“I was on the freeway when the check engine light came on with an alert I couldn't read in time before it disappeared. Then the gas pedal stopped working. I got to a safe place and shut off the car. My brother-in-law then drove the car the 5 miles back home on local roads - he videod the throttle ramping up when he was either braking or the foot wasn't on the gas pedal, which happened 4-5 times. Subaru service pulled fault code P2138.”2014 Subaru Forester · Jul 2025
P2138 on other makes
Makes with enough NHTSA reports of P2138 for their own page.
Counts are NHTSA owner complaints whose text mentions P2138 - owner-reported and unverified. Always confirm with a diagnosis of your specific vehicle.