P2135: Throttle/Pedal Position Sensor Voltage Correlation
22 vehicles · 10 makes · $30-$900 repair
Most Reported On
P2135 is an OBD-II diagnostic trouble code meaning “Throttle/Pedal Position Sensor Voltage Correlation.” P2135 means the powertrain computer detected that the two throttle position (TP) or accelerator pedal position sensors disagree with each other. Drive-by-wire systems use redundant sensors so the PCM can cross-check the throttle or pedal reading for safety; if the two signals don't correlate within an expected range, this code sets. As a fail-safe, the vehicle often enters a reduced-power 'limp' mode, causing sluggish acceleration, a stuck or hesitant throttle, and a warning light. Because it affects throttle control, it should be addressed promptly. This code is most commonly reported on 2004-2009 Jaguar XJ, 2007-2015 Jaguar XK, and 2007-2013 Chevrolet Avalanche, plus 19 other vehicles, with repair costs ranging from $30 to $900.
Common Causes
Typical Repair Cost
Based on 23 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2135, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (22)
Reduced Engine Power Mode from Throttle Body and Pedal Sensor Faults
Reduced Engine Power / Throttle Body (TAC) Failure
Service StabiliTrak / Service Traction Control / 'Reduced Engine Power' Cascade
'Reduced Engine Power' Limp Mode - Electronic Throttle (TAC) System
Reduced Engine Power / Limp Mode from Throttle Body (P2135) Failure
Reduced Engine Power / Service StabiliTrak from Throttle Body Failure
3.7L Ti-VCT Throttle Body Failure / Electronic Throttle Control (ETC) Limp Mode
Electronic Throttle Body Failure — Sudden Limp Mode & Wrench Light
Throttle Body Failure on 4.6L V8 Causing Wrench Light, Limp Mode, and Sudden Loss of Power
Electronic Throttle Body Failure - Limp Mode and Wrench Light
Electronic Throttle Module (ETM) Failure
Electronic Throttle Module (ETM) Failure
Electronic Throttle Module (ETM) Failure
Electronic Throttle Module (ETM) Failure
FAQ
What does P2135 mean?
P2135 stands for "Throttle/Pedal Position Sensor Voltage Correlation." P2135 means the powertrain computer detected that the two throttle position (TP) or accelerator pedal position sensors disagree with each other. Drive-by-wire systems use redundant sensors so the PCM can cross-check the throttle or pedal reading for safety; if the two signals don't correlate within an expected range, this code sets. As a fail-safe, the vehicle often enters a reduced-power 'limp' mode, causing sluggish acceleration, a stuck or hesitant throttle, and a warning light. Because it affects throttle control, it should be addressed promptly.
What are the most common causes of P2135?
The most common causes of P2135 are: Faulty throttle position sensor / throttle body assembly, Faulty accelerator pedal position sensor, Damaged wiring or connectors at the throttle body or pedal, Corroded or loose connector terminals, Poor ground or reference voltage problem, Carbon buildup binding the electronic throttle plate, Failed PCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P2135?
Repair costs for P2135 range from $30 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P2135?
Au7o has documented P2135 across 22 vehicle models from 10 manufacturers: Buick, Chevrolet, Chrysler, Ford, GMC, Jaguar, Nissan, Pontiac, Toyota, Volvo.
Sources (12)
- owner-reportAvalanche Engine Power Reduced Issues
- videoYouTube - How to Clean Electronic Throttle Body on Chrysler 200 (Known Channel)
- articleReduced Engine Power Problem Fixed - FixMyOldRide
- Forum2007 Tahoe/Suburban 5.3 Reduced Engine Power - Chevrolet Forum
- articleFord Electronic Throttle Body Failure: Stalling & Limp Mode in Focus, Escape, Fiesta, Fusion & Transit Connect (2008-2019)
- ForumWrench light and limp mode randomly — Ford Fiesta Forum
- ForumP061B DTC, wrench light, limp mode, etc — Fiesta ST Forum
- ForumG6 'Engine Power Reduced' Message - Pontiac G6 Forum
- Forumfixed at last! P0121, P2135, reduced engine power - Pontiac Owners Group
- articleP2135 Pontiac: Meaning, Causes, Symptoms (engine-codes.com)
- articleA Guide to the Fuel Injection Throttle Body for the 2006-2011 Buick Lucerne - Go-Parts
- Forum2006 Buick Lucerne 3.8 reduced power codes P1516 U0107 - JustAnswer
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.