What Does P1517 Mean?
The powertrain control module (PCM) has detected a voltage signal that is higher than expected in the idle air control solenoid circuit number 4. This indicates either a short to voltage, an open circuit, or a faulty solenoid.
Common Causes
35%
Damaged or shorted wiring harness to IAC solenoid
30%
Faulty idle air control solenoid valve
20%
Corroded or damaged electrical connector
10%
PCM internal fault or short to power
5%
Aftermarket accessory causing electrical interference
Diagnostic Steps
1
Step 1: Visually inspect IAC solenoid #4 connector and wiring for damage, corrosion, or shorts to power
2
Step 2: Disconnect IAC solenoid #4 and measure voltage at harness connector with key on, engine off (should be 0V or minimal)
3
Step 3: Check resistance of IAC solenoid #4 and compare to manufacturer specifications
4
Step 4: Test for short to voltage in wiring harness between PCM and solenoid using multimeter
5
Step 5: If all wiring and solenoid test OK, suspect PCM driver circuit failure
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected a voltage signal that is higher than expected in the idle air control solenoid circuit number 4. This indicates either a short to voltage, an open circuit, or a faulty solenoid.
The most common cause of P1517 (Idle Air Control Solenoid Signal 4 Circuit High Input) is: Damaged or shorted wiring harness to IAC solenoid
Typical repair costs for P1517 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may have unstable idle, stalling issues, or rough running. Generally safe to drive short distances but should be repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1517 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air Intake/Idle Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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