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P2503 is a diagnostic trouble code (DTC) for "Charging System Voltage Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Charging System Voltage Low
This diagnostic trouble code (DTC) indicates that the powertrain control module (PCM) has detected that the charging system is no longer producing the correct voltage to sufficiently charge the battery.
Symptoms of this trouble code that the driver may experience would include:
A mechanic may begin diagnosing this trouble code by locating the vehicle’s battery.
Then, the mechanic would use a digital multimeter to measure the voltage the battery is receiving with the engine running. Anything below fourteen volts is considered a low charging voltage. This test will likely fail.
The mechanic would then check the battery using a high tech battery tester to determine if the battery is good enough to hold a charge. During this test, the mechanic would ensure that the battery and cables are corrosion free.
The powertrain control module would be tested if no issues were found in the previous tests.
After all diagnostic tests are complete, the mechanic would relay his/her findings over to the customer to make a repair decision.
A common mistake when diagnosing this trouble code would be to replace the battery since it is named in the trouble code definition. Although a bad battery is a possible cause, this trouble code is referring to the lack of charging to the battery, which sounds more like another part has gone bad that relates to the battery. It is important to consider all angles when diagnosing Check Engine Lights.
This code is very serious as it can prevent the vehicle from starting or even worse, cause it to die while driving down the road. This code could cause a severe inconvenience for the driver. Codes such as this will often end up causing tow bills when the car dies as a result of it.
Corrosion is the number one enemy for a battery. Always check your battery for corrosion every time the hood is opened to help prevent trouble codes such as this one. Some manufacturers make a product that can be sprayed out of a rattle can onto the battery terminal ends to help prevent battery corrosion. It would also help to spray this chemical on the connections of the alternator as well.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230