What Does P1485 Mean?
The EGR vacuum solenoid valve circuit has an open circuit or short condition. The PCM cannot properly control EGR vacuum supply, affecting exhaust gas recirculation operation.
Common Causes
40%
Failed EGR vacuum solenoid valve
30%
Damaged wiring or connector at solenoid
15%
Short circuit in solenoid control wiring
10%
Poor ground connection for solenoid
5%
PCM driver circuit fault
Diagnostic Steps
1
Step 1: Locate and inspect EGR vacuum solenoid valve and connector for damage or corrosion
2
Step 2: Disconnect solenoid and measure coil resistance; compare to specification (typically 20-80 ohms)
3
Step 3: Check for power and ground at solenoid connector with key on
4
Step 4: Check for short to ground or power in control circuit wiring with solenoid disconnected
5
Step 5: Command solenoid on/off with scan tool and listen for audible click; verify vacuum switching
Estimated Repair Cost
$120 - $400
Parts + labor, varies by vehicle and location
The EGR vacuum solenoid valve circuit has an open circuit or short condition. The PCM cannot properly control EGR vacuum supply, affecting exhaust gas recirculation operation.
The most common cause of P1485 (EGR Solenoid Valve Vacuum Open or Short) is: Failed EGR vacuum solenoid valve
Typical repair costs for P1485 range from $120 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but will fail emissions testing. May experience reduced fuel economy and increased NOx emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1485 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
Recommended Tools
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