What does code P1190 mean?

Q: What does code P1190 mean?

Vacuum Leak. P1190 on GM vehicles indicates that the powertrain control module has detected a vacuum leak in the engine's intake system, typically by comparing short-term fuel trim corrections against expected values. The computer recognizes that unmetered air is entering the engine, causing the fuel mixture to lean out beyond a calibrated threshold.

DTC codes / GM codes / P1190

P1190 · GMVacuum Leak

P1190 on GM vehicles indicates that the powertrain control module has detected a vacuum leak in the engine's intake system, typically by comparing short-term fuel trim corrections against expected values. The computer recognizes that unmetered air is entering the engine, causing the fuel mixture to lean out beyond a calibrated threshold.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.