What does P1220 mean on a Chevy?

P1220. Throttle Position (TP) Sensor 2 Circuit. Applies to Silverado, Sierra, Tahoe, Yukon, Escalade.

What causes P1220 on a Chevy?

Failed TP Sensor 2 element inside the throttle body Bent pins in the throttle body connector TP Sensor 2 signal wire open or shorted Moisture-corroded throttle actuator terminals Mismatched throttle body and PCM calibration after a swap

How do I fix P1220 on a Chevy?

Read TP Sensor 1 versus TP Sensor 2 correlation on a Tech2 or GDS2 Inspect throttle body connector pins for bends or push-out Test the TP Sensor 2 circuit for opens and shorts to ground Verify the throttle body part number matches the vehicle calibration Replace the throttle body and perform the idle learn only after circuit tests pass

Code

P1220

Throttle Position (TP) Sensor 2 Circuit

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

What it means

P1220. Throttle Position (TP) Sensor 2 Circuit. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Escalade.

Findings, check these first

Failed TP Sensor 2 element inside the throttle body
Bent pins in the throttle body connector
TP Sensor 2 signal wire open or shorted
Moisture-corroded throttle actuator terminals
Mismatched throttle body and PCM calibration after a swap

Standard procedure

Read TP Sensor 1 versus TP Sensor 2 correlation on a Tech2 or GDS2
Inspect throttle body connector pins for bends or push-out
Test the TP Sensor 2 circuit for opens and shorts to ground
Verify the throttle body part number matches the vehicle calibration
Replace the throttle body and perform the idle learn only after circuit tests pass

Look up another code

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Sources and review

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Last updated 2026-09-13.

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