P1508 – Land Rover DTC

Land Rover DTC P1508 – Idle Speed Control Open Circuit Fault

DTC P1508 meaning on Land Rover

DTC P1508 indicates an Idle Speed Control Open Circuit Fault on a Land Rover. This fault code is triggered when the Engine Control Module (ECM) detects an open circuit in the idle speed control system, preventing proper communication and control of the idle speed.

Land Rover DTC P1508 symptoms

• Fluctuating or unstable idle speed
• Engine stalling at idle
• Difficulty starting the engine
• Reduced engine performance
• Illumination of the Check Engine Light

Land Rover DTC P1508 causes

• Faulty idle speed control valve
• Wiring or connector issues in the idle speed control circuit
• ECM malfunction
• Vacuum leaks affecting idle speed control

Land Rover DTC P1508 seriousness

The DTC P1508 Idle Speed Control Open Circuit Fault should be addressed promptly to prevent potential engine stalling and drivability issues. Ignoring this fault can lead to further damage to engine components and may result in unsafe driving conditions.

How to diagnose DTC P1508 on Land Rover

1. Perform a visual inspection of the idle speed control valve and its wiring for any visible damage or corrosion.
2. Use a multimeter to test the continuity of the idle speed control circuit to identify any open circuits.
3. Check for vacuum leaks that could affect idle speed control.
4. Scan the ECM for any additional fault codes that may provide further insight into the issue.

How to fix DTC P1508 on Land Rover

1. Replace the faulty idle speed control valve if necessary.
2. Repair or replace any damaged wiring or connectors in the idle speed control circuit.
3. If the ECM is determined to be faulty, it may need to be reprogrammed or replaced.
4. Address any vacuum leaks affecting idle speed control.

How to erase DTC P1508 on Land Rover

1. After completing the necessary repairs, use an OBD-II scanner to clear the DTC P1508 code from the ECM’s memory.
2. Ensure that the vehicle is in proper working condition by performing a test drive to verify that the issue has been resolved.

Recommended tools for Land Rover 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.