Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0505: Idle Control System Malfunction: Procedure
- CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Trouble Codes.
- Read the DTCs.
Result
Result Proceed to DTC P0505 is output A DTC P0505 and other DTCs are output B HINT:
If any DTCs other than P0505 are output, troubleshoot those DTCs first.
B → See step 5
A: Go to next step
- CHECK PCV HOSE (HOSE CONNECTIONS)
- Inspect the PCV hose connections. Refer to ON-VEHICLE INSPECTION
.
OK
PCV hose is connected correctly and is not damaged.
NG → See step 6
OK: Go to next step
- Inspect the PCV hose connections. Refer to ON-VEHICLE INSPECTION
.
- CHECK INTAKE SYSTEM
- Check the intake system for vacuum leaks.
OK
No leaks from intake system.
NG → REPAIR OR REPLACE INTAKE SYSTEM
OK: Go to next step
- Check the intake system for vacuum leaks.
- CHECK THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)
- Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body assembly. And check that the throttle valve moves smoothly.
OK
Throttle valve is not contaminated with foreign objects and moves smoothly.
NG → See step 7
OK → See step 8
- Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body assembly. And check that the throttle valve moves smoothly.
- GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
- REPAIR OR REPLACE PCV HOSE. Refer to ON-VEHICLE INSPECTION
- REPLACE THROTTLE BODY ASSEMBLY. Refer to REMOVAL
- REPLACE ECM. Refer to REMOVAL
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.