Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3)DTC P2504NOTES

2006 Mazda 6 i, 4D Sedan, Automatic

DTC P2504: Notes

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Notes

DTC P2504 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P2504

Battery overcharge

DETECTION CONDITION

PCM judges generator output voltage is above 18.5 V or battery voltage is above 16.0 V during engine running.

Diagnostic support note

This is a continuous monitor (Other).
MIL does not illuminate.
PENDING CODE is available if PCM detects the above malfunction condition.
FREEZE FRAME DATA is not available.
DTC is stored in the PCM memory.

POSSIBLE CAUSE

Short to power supply between generator connector terminal D and PCM connector terminal 2AI
Generator malfunction
PCM and/or generator are poorly connected.

Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.