P2135 on Ford Focus
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 Ford Focus 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 Ford Focus
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 Ford Focus Owner Reports
Source: NHTSA Complaints Database
"Car went into limp home mode (wrench light) while pulling into traffic, sudden loss of power almost led to accident. my two year old was in the vehicle, with her side exposed to oncoming traffic when the car lost connection between the accelerator and throttle. returned home immediately."
"My yellow wench check engine light came on,i was stopped at a 4 way city intersection and when i stepped on the gas pedal the car would not pick up any speed. i was stuck with traffic behind me."
"I turned on the engine in the morning and the car seem to start fine, but when i put the gear selector in reverse and pressed the gas pedal suddenly the check engine came on and the car started shaking violently, i instantly turned off the car after a few seconds i tried turning the car back on, t"
"Engine surged/faded a few times lately and twice the wrench symbol came on, but the dealership said no codes were reported and they could find no problems. today while driving on the interstate the speed suddenly decelerated to 0 so i pulled over to the shoulder to avoid being hit from behind."
"I drive approximately 1 hour each way to work and back. during this trip i am spend a lot of time on two lane major access roadways with speeds of 55 mph."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Ford Focus
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.