Low Charging System Voltage: Diagnosing and Repairing a P2503 DTC in a Mazda 2.0L DISI Engine | PDF | Electrical Connector | Equipment
P2503 Code: Charging System Voltage Low - In The Garage with CarParts.com
DTC P2503
P2503 Mazda 2009 x7 charging problem - YouTube
Mazda 6 Service Manual - Dtc p2504 - On-board diagnostic
Mazda 6 Service Manual - Dtc p2503 - On-board diagnostic
code U0155, P2503. Autozone showed PASS on "diodes and voltage regulation" but fail on charging current. guy said this meant alternator. Odds are a bad alternator or wiring issue? : r/MechanicAdvice