P2504 Fault Code

Charging System Voltage High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2504 fault code indicates that there is an issue with the charging system where the voltage is higher than the expected range. This can lead to potential damage to electrical components and battery issues if not addressed promptly. Drivers may notice irregularities in electrical systems during operation.

What are the symptoms of the P2504 code?

Common symptoms that may occur when the P2504 fault code is triggered include:

• Battery warning light illuminated on the dashboard.
• Dimming or flickering lights, especially during engine start-up.
• Overheating alternator.
• Strange smells due to overheating wires or components.
• Electrical system failures, such as radio or power windows not functioning properly.

What causes the P2504 code?

There are several possible causes for elevated charging system voltage, including:

• Faulty voltage regulator that fails to control the output voltage from the alternator.
• A defective alternator that is overcharging.
• Poor connections at wiring harnesses or grounds, leading to incorrect voltage readings.
• Weak or failing battery that cannot handle higher voltages.
• Malfunctioning sensors or ECM (Engine Control Module) that inaccurately monitor and regulate system voltage.

How to fix P2504?

To resolve the P2504 fault code, follow these steps:

1. Conduct a thorough inspection of the charging system, starting with the alternator and voltage regulator.
2. Use a multimeter to measure the output voltage of the alternator to ensure it is within the manufacturer’s specifications.
3. Check all connections, wiring, and ground points for any signs of damage or corrosion.
4. If necessary, replace the faulty alternator or voltage regulator.
5. Clear the fault code and conduct a road test to ensure the system operates correctly.