Engine Vacuum Leak
2002-2009 GMC Envoy 4.2L I6 🇩🇪
Description
The PCM detected an engine vacuum leak based on fuel trim adaptation data. The system has determined that unmetered air is entering the engine.
Symptoms
- Check Engine Light
- Rough idle
- Lean running condition
- Poor fuel economy
- Hissing noise from engine
Common Causes
- Cracked or disconnected vacuum hose
- Intake manifold gasket leak
- Brake booster vacuum leak
- PCV valve or hose leak
- Throttle body gasket leak
Diagnostic Steps
- Perform smoke test on intake system
- Inspect all vacuum hoses and connections
- Check intake manifold gaskets
- Test brake booster vacuum hose
- Inspect PCV system
Repair Notes
Perform smoke test to locate leak. Repair or replace damaged hoses, gaskets, or fittings.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P1190 on Other Vehicles
Common Questions
What does code P1190 mean on a 2002-2009 GMC Envoy?
P1190 stands for "Engine Vacuum Leak". The PCM detected an engine vacuum leak based on fuel trim adaptation data. The system has determined that unmetered air is entering the engine.
What are the symptoms of P1190 on a GMC Envoy?
Common symptoms of P1190 include: Check Engine Light, Rough idle, Lean running condition, Poor fuel economy, Hissing noise from engine.
What causes P1190 on a 2002-2009 GMC Envoy?
Common causes of P1190 include: Cracked or disconnected vacuum hose, Intake manifold gasket leak, Brake booster vacuum leak, PCV valve or hose leak, Throttle body gasket leak.