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P0563 is a diagnostic trouble code (DTC) for "System Voltage High". 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
This code is also known as System Voltage High, or in some makes of vehicles, Battery System High.
The ECM (engine control module) receives power from the battery even when the vehicle is turned off. This permits data storage and other essential functions.
A vehicle will store this fault code when the ECM detects a voltage reading which is out of range from what is expected. The ECM assumes a power supply circuit fault and automatically triggers P0563 and often the Service Engine Soon lamp. This voltage variation could originate from the battery itself, the alternator, or other components in the starting system or the charging system.
Problems that could cause the system voltage to be out of range include:
The battery light may come on, the engine could stall while idling, automatic transmission may not function properly, the Check Engine Light may illuminate, and if left un-repaired, fuel efficiency could be affected.
A qualified technician may follow these steps to identify the source of the code:
Use an OBD-II scanner to gather freeze frame and other data from the vehicle’s computer, followed by resetting the code to see if it returns
Visually inspect all wiring, cables, and connectors related to the battery, and the starting and charging systems
Perform a load test on the battery
Assess battery voltage readings using a starting/charging system tester
Test the starter current draw using an amp probe
Test the alternator circuits with an ohmmeter
Perform a continuity test on the system circuits
It’s common for people to replace the battery first without determining whether that’s actually the source of the problem. Frequently, the alternator is the issue, so it’s vital that all systems are tested and all wiring and cables checked thoroughly. Some drivers have been told to replace their entire transmission because the vehicle may enter limp mode when storing this code. This is an extremely expensive, usually unnecessary repair in this situation.
This code can impair your vehicle’s ability to be driven, possibly putting it into limp mode or even preventing it from starting at all. Any time there is something wrong with the charging or starting system, you should have the problem assessed and repaired by a qualified technician as soon as possible.
Possible repairs that may need to be performed to fix this fault code include:
Once the battery or other components have been replaced, it’s critical that all codes be cleared from the vehicle’s computer. If all codes are not erased, the vehicle may still perceive an issue, even with brand new components installed.
Some vehicle makes have a potential problem with transmission fluid leaking onto a terminal near the TCM (transmission control module) which can cause a short in the circuit board. This is a particularly prominent issue in some Mercedes models. Always get a second opinion from a qualified professional before going ahead with a transmission replacement. The problem could lie in the P0563 code rather than the actual transmission.
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.