P2135 on Buick
Throttle/Pedal Position Sensor Voltage Correlation
P2135 on Buick vehicles indicates throttle/pedal position sensor voltage correlation. Au7o has documented this code across 1 Buick model — most commonly on Lucerne. 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 Buick range from $250 to $600, 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 Buick by Model
Buick Lucerne(1 issue)
- Throttle Body / Throttle Position Sensor Causing Reduced Engine Power2006-2011
A failing electronic throttle body or throttle position sensor triggers a 'Reduced Engine Power' message and limp mode, with rough or surging idle and hesitant acceleration. The condition is common enough that GM issued a special coverage adjustment extending the throttle body warranty on some 2009-2011 cars.
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View P2135 across all makes →Frequently Asked Questions
What does P2135 mean on Buick?▼
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 Buick specifically, this code is documented across 1 model.
What causes P2135 on Buick vehicles?▼
Common causes on Buick: 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 Buick?▼
Repair costs on Buick range from $250 to $600, depending on the specific model and root cause.
Which Buick models have P2135 documented?▼
Au7o has documented P2135 on 1 Buick model: Lucerne.