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P1503: Idle Speed Control Valve Closing Solenoid Control Circuit Signal Low

BMW VOLKSWAGEN BUICK CADILLAC CHEVY CHRYSLER GM GMC
Severity
Medium
System
Manufacturer-Specific Powertrain
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P1503 Mean?

P1503 is a manufacturer-specific diagnostic trouble code: Idle Speed Control Valve Closing Solenoid Control Circuit Signal Low. This code applies to BMW, VOLKSWAGEN, BUICK, CADILLAC, CHEVY vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1503

Common Causes

Frequently Asked Questions

What does P1503 mean?
P1503 indicates: Idle Speed Control Valve Closing Solenoid Control Circuit Signal Low. The vehicle's computer has detected that the Idle Speed Control Valve Closing Solenoid is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P1503?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1503 for extended periods may cause additional problems.
How much does it cost to fix P1503?
Repair costs for P1503 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair Idle Speed Control Valve Closing Solenoid wiring and connectors
  • 🔧 Replace faulty Idle Speed Control Valve Closing Solenoid
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P1500 Fuel Pump Relay Electrical Circuit Malfunction P1501 Programmable Speedometer & Odometer Module Vehicle Speed Sensor Intermittent Circuit Failure P1502 Idle Speed Control Valve Closing Solenoid Control Circuit Signal High Or Low P1504 Idle Speed Control Valve Closing Solenoid Control Open Circuit P1505 Idle Speed Control Valve Closing Solenoid Control Circuit Electrical P1506 Idle Speed Control Valve Open Solenoid Control Circuit Signal High P1507 Idle Speed Control Valve Open Solenoid Control Circuit Signal Low P1508 Idle Speed Control Valve Opening Solenoid Control Open Circuit P1509 Idle Speed Control Valve Opening Solenoid Control Circuit Electrical P1510 Idle Air Control Solenoid Signal 1 Circuit Low Input