What does P1515 mean on a Chevy?

P1515. Electronic Throttle System Throttle Position. Applies to Silverado, Sierra, Tahoe, Yukon, Escalade, Hummer H2.

What causes P1515 on a Chevy?

Worn throttle position sensors inside the throttle body disagreeing with each other Carbon buildup binding the throttle blade on high-mileage Vortec engines Corroded throttle body connector from moisture under the engine cover Low system voltage during cranking corrupting TAC position learn

How do I fix P1515 on a Chevy?

Read both TP sensor voltages with a Tech2/GDS2 scan tool; they must track together through the full sweep Clean the throttle bore and perform the TAC relearn procedure first Load-test the battery and charging system since low voltage sets false TAC codes Replace the throttle body assembly only if the sensors disagree after cleaning

Code

P1515

Electronic Throttle System Throttle Position

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Yukon, Escalade, Hummer H2
Related: No single generic twin. See OBD Codes List

What it means

P1515. Electronic Throttle System Throttle Position. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Escalade, Hummer H2.

Findings, check these first

Worn throttle position sensors inside the throttle body disagreeing with each other
Carbon buildup binding the throttle blade on high-mileage Vortec engines
Corroded throttle body connector from moisture under the engine cover
Low system voltage during cranking corrupting TAC position learn

Standard procedure

Read both TP sensor voltages with a Tech2/GDS2 scan tool; they must track together through the full sweep
Clean the throttle bore and perform the TAC relearn procedure first
Load-test the battery and charging system since low voltage sets false TAC codes
Replace the throttle body assembly only if the sensors disagree after cleaning

Look up another code

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Sources and review

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Last updated 2026-09-13.

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