P1508high severityPowertrain
Idle Air Control Valve Circuit Open
on 2018 Acura TLX 2.4L I4 · AWD
What this code means
Electrical open circuit in the IAC valve coil.
Symptoms
- CEL
- Very low idle
- Stalling at idle
- Surging 1500-1700 RPM
- Only runs with foot on gas
Common causes
- Faulty IAC valve open circuit
- Damaged wiring
- Corroded connector
- Faulty PCM driver
Diagnostic steps
- Test IAC resistance
- Inspect wiring
- Check connector
- Test PCM output
Repair notes
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