What does P1122 mean on a Chevy?

P1122. Throttle Position (TP) Sensor Circuit Intermittent Low Voltage. Applies to Silverado, Sierra, Tahoe, Yukon, Avalanche.

What causes P1122 on a Chevy?

Worn TP sensor dropping signal intermittently TP signal wire chafed to ground Spread terminals in the throttle body connector Carbon-tracked throttle body connector from moisture Failing 5V reference shared with the MAP sensor

How do I fix P1122 on a Chevy?

Sweep-test both TP sensors on a Tech2 or GDS2 for voltage dropouts Wiggle-test the throttle harness while holding a steady pedal position Check 5V reference at the throttle body connector under load Clean and reseat the throttle body connector with dielectric grease Replace the throttle body only after wiring proves good, then run the idle relearn

Code

P1122

Throttle Position (TP) Sensor Circuit Intermittent Low Voltage

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

What it means

P1122. Throttle Position (TP) Sensor Circuit Intermittent Low Voltage. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Avalanche.

Findings, check these first

Worn TP sensor dropping signal intermittently
TP signal wire chafed to ground
Spread terminals in the throttle body connector
Carbon-tracked throttle body connector from moisture
Failing 5V reference shared with the MAP sensor

Standard procedure

Sweep-test both TP sensors on a Tech2 or GDS2 for voltage dropouts
Wiggle-test the throttle harness while holding a steady pedal position
Check 5V reference at the throttle body connector under load
Clean and reseat the throttle body connector with dielectric grease
Replace the throttle body only after wiring proves good, then run the idle relearn

Look up another code

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Sources and review

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Last updated 2026-09-13.

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