P1503 – OBD-II DTC

OBD-II DTC P1503 – SPCUT Solenoid Circuit Malfunction

DTC P1503 meaning

DTC P1503 refers to a malfunction in the SPCUT (Speed Control Cut) solenoid circuit. This code indicates that the Engine Control Module (ECM) has detected an issue with the solenoid responsible for controlling the speed of the vehicle, particularly in relation to the cruise control system. The SPCUT solenoid plays a crucial role in regulating engine speed and maintaining vehicle control during cruise operation.

DTC P1503 symptoms

Common symptoms associated with DTC P1503 may include:

• Inability to engage or use cruise control
• Erratic engine speed or fluctuations
• Check Engine Light illuminated on the dashboard
• Unresponsive throttle during cruise control operation
• Potential stalling or reduced engine performance

DTC P1503 causes

Several factors can lead to the triggering of DTC P1503, including:

• Faulty SPCUT solenoid
• Wiring issues, such as shorts or open circuits in the solenoid circuit
• Corroded or loose electrical connectors
• Malfunctioning ECM or software issues
• Vacuum leaks affecting the solenoid operation

DTC P1503 seriousness

DTC P1503 is considered a moderate to serious issue. While it may not immediately affect the vehicle’s ability to operate, it can lead to unsafe driving conditions due to the loss of cruise control functionality. Additionally, if left unaddressed, it may result in further engine performance issues or damage to other components.

How to diagnose DTC P1503

To diagnose DTC P1503, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1503 code.
2. Inspect the SPCUT solenoid and its wiring for visible damage or corrosion.
3. Check electrical connectors for tightness and cleanliness.
4. Test the SPCUT solenoid for proper operation using a multimeter.
5. Examine the ECM for any software updates or faults.
6. Look for vacuum leaks that may affect solenoid performance.

How to fix DTC P1503 step-by-step instructions

To fix DTC P1503, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the SPCUT solenoid.
2. If the SPCUT solenoid is faulty, replace it with a new one.
3. Ensure all electrical connections are secure and free of corrosion.
4. Check for and repair any vacuum leaks that may impact solenoid function.
5. Reprogram or update the ECM if necessary.
6. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.

How to erase DTC P1503

To erase DTC P1503, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the diagnostic menu on the scanner and locate the option to clear or erase codes.
4. Select the option to erase DTCs and confirm the action.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.