P2135: Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
What Does P2135 Mean?
P2135 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation. This code relates to the powertrain system. It has been reported in NHTSA complaints across 24 different vehicle models.
Symptoms of P2135
- ⚠️ Check engine light illuminated
- ⚠️ Rough or unstable idle
- ⚠️ Engine misfires
- ⚠️ Loss of engine power
- ⚠️ Vehicle won't start
- ⚠️ Jerking or surging while driving
Common Causes
- 🔍 Throttle body or throttle position sensor issue
- 🔍 Dirty or failed MAF sensor
- 🔍 Wiring or connector problem
- 🔍 Sensor or control module malfunction
P2135 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"TL* THE CONTACT OWNS A 2013 HONDA ACCORD. THE CONTACT STATED THAT WHILE DRIVING 25 MPH, ALL OF THE WARNING LIGHTS ILLUMINATED AS THE VEHICLE BEGAN TO SHAKE VIOLENTLY. THE VEHICLE WAS DRIVEN TO AN INDEPENDENT MECHANIC FOR DIAGNOSIS BUT NO CAUSE FOR THE FAILURE WAS DETERMINED. THE VEHICLE WAS TAKEN TO"
— Honda Accord owner, 07/27/2013
"5 times we have experienced P2135 code. 4 times this year, causing the dash warning lights to flash numerous warnings and the vehicle goes into immediate limp mode. Unable to accelerate normally and unable to drive faster than 30-35 mph on the freeway causing us to drive on the shoulder until we ar"
— Honda Pilot owner, 08/10/2022
"WHILE DRIVING THE 2009 FORD ESCAPE DOWN HIGHWAY, EXPERIENCED A BRIEF LURCH THEN COMPLETE AND IMMEDIATE LOSS OF THROTTLE CONTROL. ENGINE SPEED DECREASED TO APPROX. 1000 RPM MAKING IT IMPOSSIBLE TO CONTINUE DRIVING AND FORCING AN EMERGENCY STOP ON SHOULDER. WHILE STOPPED ON SHOULDER, ENGINE WAS COMP"
— Ford Escape owner, 08/24/2013
Source: NHTSA Complaints Database
Most Reported Vehicles for P2135
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | CHEVROLET MALIBU | |
| 2 | FORD FOCUS | |
| 3 | CHEVROLET EQUINOX | |
| 4 | CHEVROLET CRUZE | |
| 5 | CHEVROLET TAHOE | |
| 6 | CHEVROLET IMPALA | |
| 7 | HYUNDAI SONATA | |
| 8 | FORD ESCAPE | |
| 9 | NISSAN ALTIMA | |
| 10 | KIA SORENTO | |
| 11 | JEEP PATRIOT | |
| 12 | GMC YUKON | |
| 13 | HONDA ACCORD | |
| 14 | HONDA PILOT | |
| 15 | FORD EXPLORER |
P2135 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Diagnostic Tips
- Scan all modules, save freeze-frame data, and clear unrelated history codes before focusing on P2135.
- Confirm whether companion codes are present first; they often identify the root cause sooner than the headline DTC.
- Prioritize inspection around vehicle speed control and the most common failure path for this code family.
- Check APP/TPS correlation PIDs through slow pedal sweeps; look for dropouts, lag, or disagreement between paired sensors.
- After each repair step, complete one drive cycle and verify readiness monitors instead of judging success after a quick idle test.
- If the code keeps returning on high-incidence platforms (for example CHEVROLET MALIBU), check TSB patterns and wiring/connector fitment before major part replacement.
Common Mistakes to Avoid
- ❌ Skipping freeze-frame review and losing the exact RPM/load conditions when the fault set.
- ❌ Replacing the throttle body without checking APP sensor correlation and connector pin tension.
- ❌ Clearing P2135 and returning the car before monitors complete — this often creates repeat visits.
- ❌ Treating intermittent wiring or connector faults as permanent component failure without wiggle testing.
Frequently Asked Questions
Can I drive with this code?
Will this code clear itself?
How do I find the exact cause?
Reported Repair Costs for P2135
Based on 4 owner-reported repair costs from NHTSA complaints.
⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Inspect wiring harness and connectors for damage, corrosion, or loose connections
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.