P1652moderate severityPowertrain
Idle Air Control Valve Circuit
on 2009 Toyota Highlander 3.5L V6 · AWD
What this code means
The ECM detected a malfunction in the IAC valve control circuit.
Symptoms
- CEL
- High/low idle
- Erratic idle
- Stalling at idle
- Surging
Common causes
- Faulty IAC valve
- Carbon in IAC passages
- Damaged wiring
- Poor ECM ground
Diagnostic steps
- Test IAC valve resistance
- Clean IAC passages
- Inspect wiring
- Check grounds
Repair notes
Clean or replace IAC valve.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1