Air Injection System Switching Valve Solenoid Circuit (Chrysler)
What does P1485 mean?
The P1485 code means the vehicle's onboard diagnostic system has detected: Air Injection System Switching Valve Solenoid Circuit (Chrysler). This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Slightly increased emissions at startup
- Failed emissions test
- No noticeable drivability symptoms
- Possible sulfur smell during cold start
Probable Causes (Ranked by Likelihood)
- Faulty air injection switching valve solenoid Very High
- Corroded solenoid connector High
- Open or shorted wiring to the solenoid Moderate
- Failed PCM output driver Low
- Stuck air switching valve Low
Step-by-Step Diagnostic Procedure
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Locate the air injection switching valve solenoid and check its electrical connector for corrosion.
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Test the solenoid coil resistance with a multimeter. It should typically read 20 to 40 ohms.
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Apply 12V and ground directly to the solenoid to verify it clicks and operates.
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Check wiring between the PCM and solenoid for continuity and shorts.
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Use a scan tool to command the solenoid and verify the PCM output signal is present.
Frequently Asked Questions
What does the air injection system do?
The secondary air injection system pumps fresh air into the exhaust during cold starts to help the catalytic converter heat up faster and reduce cold-start emissions.
Can I drive with P1485?
Yes. This system only operates during cold starts for a brief period. Driving is not affected, though you will fail an emissions test and emissions during cold starts will be higher.
Is this code common on HEMI engines?
Yes. The 5.7L HEMI uses a secondary air injection system, and the switching valve solenoid is a known failure point on these engines, especially in vehicles with higher mileage.