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.

2006 Mazda 6 MazdaspeedFACTORY OEM SERVICE PROCEDURE

DTC P2502: Notes

DTC P2502 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P2502

Charging system voltage problem

DETECTION CONDITION

PCM determines that the generator output voltage is above 17 V or the battery voltage is below 11 V while the engine is running.

Diagnostic support note

This is a continuous monitor (Other).
The MIL does not illuminate.
FREEZE FRAME DATA is not available.
DTCs are stored in the PCM memory.

POSSIBLE CAUSE

Open circuit between generator terminal B and battery positive terminal
Battery malfunction
Generator malfunction
PCM is poorly connected
PCM, generator and/or battery are poorly connected

Courtesy of MAZDA MOTORS CORP.

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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.