What does P1271 mean on a Chevy?

P1271. Accelerator Pedal Position (APP) Sensor 1-2 Correlation. Applies to Silverado, Sierra, Tahoe, Suburban, Yukon.

What causes P1271 on a Chevy?

Worn accelerator pedal assembly with disagreeing sensors Stretched or binding throttle cable on cable-actuated pedals Corroded APP connector under the dash Floor mat or debris jamming pedal travel Low 5V reference affecting one APP sensor

How do I fix P1271 on a Chevy?

Graph APP Sensor 1 versus APP Sensor 2 on a Tech2 or GDS2 through full travel Inspect pedal travel for binding, mats, or debris Check the APP connector for corrosion and terminal tension Test both 5V references and grounds at the pedal connector Replace the pedal assembly only if correlation fails with good wiring, then clear and relearn

Code

P1271

Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Suburban, Yukon
Related: No single generic twin. See OBD Codes List

What it means

P1271. Accelerator Pedal Position (APP) Sensor 1-2 Correlation. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Suburban, Yukon.

Findings, check these first

Worn accelerator pedal assembly with disagreeing sensors
Stretched or binding throttle cable on cable-actuated pedals
Corroded APP connector under the dash
Floor mat or debris jamming pedal travel
Low 5V reference affecting one APP sensor

Standard procedure

Graph APP Sensor 1 versus APP Sensor 2 on a Tech2 or GDS2 through full travel
Inspect pedal travel for binding, mats, or debris
Check the APP connector for corrosion and terminal tension
Test both 5V references and grounds at the pedal connector
Replace the pedal assembly only if correlation fails with good wiring, then clear and relearn

Look up another code

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Sources and review

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Last updated 2026-09-13.

Report a correction for P1271. Include your vehicle, the issue and a source if you have one.