What does P1519 mean on a Chevy?

P1519. Throttle Actuator Control Module Internal Circuit. Applies to Silverado, Sierra, Tahoe, Yukon, Escalade.

What causes P1519 on a Chevy?

Internal TAC module circuit board failure from heat cycling Water intrusion into the TAC module mounted on the firewall Voltage spike damage from jump-starting or alternator overcharge Corroded module ground causing internal self-test failure

How do I fix P1519 on a Chevy?

Verify battery voltage, grounds, and TAC connectors before condemning the module Check for stored low-voltage or charging-system codes that could trigger a false internal fault Test TAC module powers and grounds pin by pin with a multimeter Replace the TAC module and perform the relearn procedure with a Tech2/GDS2 scan tool

Code

P1519

Throttle Actuator Control Module Internal 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

P1519. Throttle Actuator Control Module Internal Circuit. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Escalade.

Findings, check these first

Internal TAC module circuit board failure from heat cycling
Water intrusion into the TAC module mounted on the firewall
Voltage spike damage from jump-starting or alternator overcharge
Corroded module ground causing internal self-test failure

Standard procedure

Verify battery voltage, grounds, and TAC connectors before condemning the module
Check for stored low-voltage or charging-system codes that could trigger a false internal fault
Test TAC module powers and grounds pin by pin with a multimeter
Replace the TAC module and perform the relearn procedure with a Tech2/GDS2 scan tool

Look up another code

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Sources and review

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Last updated 2026-09-13.

Report a correction for P1519. Include your vehicle, the issue and a source if you have one.