P2135 on Chevrolet
Throttle/Pedal Position Sensor Voltage Correlation
P2135 on Chevrolet vehicles indicates throttle/pedal position sensor voltage correlation. Au7o has documented this code across 1 Chevrolet model — most commonly on Avalanche. 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. Typical repair costs on Chevrolet range from $100 to $500, depending on the specific model and root cause.
Common Causes of P2135
- •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)
P2135 on Chevrolet by Model
Chevrolet Avalanche(1 issue)
- Reduced Engine Power Mode from Throttle Body and Pedal Sensor Faults2007-2013
The 2007-2013 Avalanche frequently enters "Reduced Engine Power" mode, severely limiting acceleration. The most common causes are the electronic throttle body wearing out or the accelerator pedal position sensor (APP sensor) developing faults. The vehicle becomes barely drivable in this mode, struggling to accelerate to highway speeds. The issue can occur intermittently before becoming permanent.
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View P2135 across all makes →Frequently Asked Questions
What does P2135 mean on Chevrolet?▼
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. On Chevrolet specifically, this code is documented across 1 model.
What causes P2135 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2135 on a Chevrolet?▼
Repair costs on Chevrolet range from $100 to $500, depending on the specific model and root cause.
Which Chevrolet models have P2135 documented?▼
Au7o has documented P2135 on 1 Chevrolet model: Avalanche.