What Does P1510 Mean?
The powertrain control module (PCM) has detected an abnormally low voltage signal from the idle air control (IAC) solenoid circuit. This indicates either a wiring issue, poor connection, or a faulty IAC valve preventing proper idle speed control.
Common Causes
35%
Faulty idle air control valve with internal short or open circuit
30%
Damaged wiring harness or corroded connector pins between PCM and IAC valve
20%
Poor ground connection at IAC valve or circuit
15%
Failed powertrain control module (PCM) driver circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of IAC valve connector for corrosion, damage, or loose pins
2
Step 2: Measure voltage at IAC valve connector with key on, engine off (should see battery voltage on supply wire)
3
Step 3: Check resistance of IAC solenoid windings (typically 8-15 ohms, consult service manual)
4
Step 4: Test ground circuit continuity between IAC valve and PCM ground
5
Step 5: If all circuits test good, perform PCM driver circuit test or substitute known-good IAC valve
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected an abnormally low voltage signal from the idle air control (IAC) solenoid circuit. This indicates either a wiring issue, poor connection, or a faulty IAC valve preventing proper idle speed control.
The most common cause of P1510 (Idle Air Control Solenoid Signal 1 Circuit Low Input) is: Faulty idle air control valve with internal short or open circuit
Typical repair costs for P1510 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience rough idle, stalling at stops, or high/low idle speed. Generally safe to drive short distances but may stall unexpectedly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1510 to identify the root cause.
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Quick Info
Category
Powertrain
System
Idle Air Control System
Difficulty
Type
Manufacturer
Recommended Tools
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