What Does P1507 Mean?
The PCM has detected a low voltage signal on the idle speed control valve opening solenoid control circuit. This indicates the control signal is stuck low or experiencing a short to ground, affecting idle speed control valve operation.
Common Causes
40%
Short to ground in opening solenoid control circuit wiring
25%
Failed ISC valve with internal short to ground in opening solenoid
20%
PCM driver circuit failed in grounded state
15%
Damaged connector pins causing short to ground at ISC valve or PCM
Diagnostic Steps
1
Step 1: Disconnect ISC valve connector and measure resistance to ground on PCM control wire (should be high resistance/open)
2
Step 2: Check for continuity to ground on control circuit with ISC disconnected and key off
3
Step 3: Inspect ISC valve connector and PCM connector for bent pins shorting to ground terminals
4
Step 4: Test opening solenoid coil resistance at ISC valve (compare to specifications)
5
Step 5: Monitor control circuit voltage at PCM connector while commanding valve operation with scan tool
Estimated Repair Cost
$120 - $550
Parts + labor, varies by vehicle and location
The PCM has detected a low voltage signal on the idle speed control valve opening solenoid control circuit. This indicates the control signal is stuck low or experiencing a short to ground, affecting idle speed control valve operation.
The most common cause of P1507 (Idle Speed Control Valve Open Solenoid Control Circuit Signal Low) is: Short to ground in opening solenoid control circuit wiring
Typical repair costs for P1507 range from $120 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Idle speed control will be compromised, potentially causing rough idle, stalling, or difficulty maintaining proper idle. Stalling in traffic presents safety concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1507 to identify the root cause.
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Quick Info
Category
Powertrain
System
Idle Speed Control
Difficulty
Type
Manufacturer
Recommended Tools
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