Start-Stop Brake Vacuum Pump Performance
2011-2011 Acura TSX 3.5L V6
The 2011 Acura TSX is equipped with a 3.5L V6 engine. Below you'll find detailed p3604 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The electric brake vacuum pump that maintains brake boost during engine-off periods in start-stop systems is not providing adequate vacuum.
Symptoms
- Start-stop disabled
- Firm brake pedal during engine stop
- Brake assist warning
- Start-stop inhibited due to brake system
- Hard pedal after one or two stops
Common Causes
- Electric vacuum pump motor weak
- Check valve in vacuum line leaking
- Vacuum line crack or disconnect
- Pump control module fault
- Brake booster diaphragm leak
Diagnostic Steps
- Monitor brake vacuum level during engine-off events
- Test electric vacuum pump operation
- Check vacuum lines and check valves
- Measure vacuum decay rate with engine off
- Test brake booster for leaks
Repair Notes
Replace electric vacuum pump or check valve. Repair vacuum line leaks. Ensure brake boost is adequate during engine-off periods.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3604 on Other Vehicles
Common Questions
What does code P3604 mean on a 2011-2011 Acura TSX?
P3604 stands for "Start-Stop Brake Vacuum Pump Performance". The electric brake vacuum pump that maintains brake boost during engine-off periods in start-stop systems is not providing adequate vacuum.
What are the symptoms of P3604 on a Acura TSX?
Common symptoms of P3604 include: Start-stop disabled, Firm brake pedal during engine stop, Brake assist warning, Start-stop inhibited due to brake system, Hard pedal after one or two stops.
What causes P3604 on a 2011-2011 Acura TSX?
Common causes of P3604 include: Electric vacuum pump motor weak, Check valve in vacuum line leaking, Vacuum line crack or disconnect, Pump control module fault, Brake booster diaphragm leak.
Last updated: March 2026