P2135 on Chevrolet Impala
Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Chevrolet Impala context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P2135.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P2135 Means on Your Chevrolet Impala
P2135 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Chevrolet Impala Owner Reports
Source: NHTSA Complaints Database
"Had purchased vehicle from dealer in ashland va back in september 2014. had no concerns about the vehicle until first trip not driving vehicle for a week and upon return vehicle would not start. had jumped started vehicle and got check engine light which was on for three days then cut off."
"Driving home one night after just having my vehicle repaired a few weeks earlier, without warning, my vehicle began to stall. just before the stall it was driving completely normal with no issues at all."
"Backing out of my garage when check engine, stabilitrak problem, reduced engine power light came on message portion of dash.drove under reduced power, max 30 mph, to dealer, approximately 15 miles. left car with dealer for approximately 2 days."
"I own a 2011 chevy impala and for the past couple months on 6 different occasions as i am driving down the freeway my engine power is reduced and "service stabilitrak" light appears. as i have researched and have found that this is a common and very unsafe problem among gm vehicles."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Chevrolet Impala
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.