P2128 on 2007-2013 Chevrolet Avalanche — Throttle/Pedal Position Sensor E Circuit High Input
1 vehicles · 1 makes · $100-$500 repair
Most Reported On
P2128 is an OBD-II diagnostic trouble code meaning “Throttle/Pedal Position Sensor E Circuit High Input.” This code means the throttle or accelerator pedal position sensor 'E' is sending a signal voltage higher than its normal expected range. Modern vehicles use electronic throttle control, where pedal and throttle sensors (often with redundant 'E/F' channels) tell the computer how far the driver is pressing and how far the throttle is open. A high-input reading indicates an electrical fault such as a short to voltage or a wiring problem in that sensor channel. The computer may limit throttle response or enter a reduced-power 'limp' mode for safety until the fault is resolved. This code is most commonly reported on 2007-2013 Chevrolet Avalanche, with repair costs ranging from $100 to $500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2128, 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)
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- 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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FAQ
What does P2128 mean?
P2128 stands for "Throttle/Pedal Position Sensor E Circuit High Input." This code means the throttle or accelerator pedal position sensor 'E' is sending a signal voltage higher than its normal expected range. Modern vehicles use electronic throttle control, where pedal and throttle sensors (often with redundant 'E/F' channels) tell the computer how far the driver is pressing and how far the throttle is open. A high-input reading indicates an electrical fault such as a short to voltage or a wiring problem in that sensor channel. The computer may limit throttle response or enter a reduced-power 'limp' mode for safety until the fault is resolved.
What are the most common causes of P2128?
The most common causes of P2128 are: Faulty pedal/throttle position sensor (channel E), Wiring shorted to voltage or power, Corroded or damaged sensor connector, Open or high-resistance ground/reference circuit, Chafed or pinched harness wiring, Faulty accelerator pedal assembly or throttle body, Faulty engine control module (PCM) — rare. The specific cause varies by vehicle.
How much does it cost to fix P2128?
Repair costs for P2128 range from $100 to $500, depending on the vehicle and root cause.
Which vehicles are affected by P2128?
Au7o has documented P2128 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.