P2135: Throttle/Pedal Position Sensor Voltage Correlation
12 vehicles · 7 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 9 other vehicles, with repair costs ranging from $30 to $900.
Common Causes
Typical Repair Cost
Based on 12 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
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (12)
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 12 vehicle models from 7 manufacturers: Buick, Chevrolet, Chrysler, Ford, Jaguar, Pontiac, Volvo.
Sources (8)
- owner-reportAvalanche Engine Power Reduced Issues
- 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
- TSBFord TSB 13-1-15: Electronic throttle body intermittent concerns/wrench light
- 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)
- videoYouTube - How to Clean Electronic Throttle Body on Chrysler 200 (Known Channel)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.