Fault code P0563 – system voltage high

Fault code P0563 is called “System Voltage High” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P0563

This diagnostic trouble code (DTC) is a generic code. Error P0563 is considered a generic code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.

Fault code P0563 – system voltage high

This fault code is defined as a “voltage system failure”. It is set when the Powertrain Control Module (PCM) detects low voltage from the battery.

When the ignition is turned to the “ON” position, the PCM performs a check on the charging, starting, and battery systems. When the engine is running, in a fully functional system, the on-board voltage should be between 13.8 and 14.4 volts.

The Powertrain Control Module (PCM) monitors the ignition circuit to determine if the charging system is operating. If the voltage is too high, a fault code will be set. This code will also appear if there is no voltage, but there should be.

This problem is an electrical problem. And readings above the programmed range, will cause the warning light on the dashboard to go off. Also, error code P0563 will be stored and stored in the memory as a fault.

Symptoms of vehicle malfunctions

The main signal that an error P0563 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. Check engine control lamp on the control panel will light up (the code will be recorded in the memory as a fault).
  2. The red battery charge indicator lights up.
  3. The engine stalls or fails to start.
  4. Frequent or unpredictable stopping of the engine.
  5. Increased fuel consumption.
  6. Abrupt, erratic or unpredictable shifting of automatic transmissions.
  7. Incorrect instrument readings.
  8. Constant discharge of the battery.

The P0563 error is quite serious, as it can cause problems with the battery, the starting system, or the charging system. It may also affect the functioning of other vehicle systems. Therefore, it is recommended that the error is corrected as soon as possible when the fault is detected.

Factors that can cause this error code

The error code P0563 can mean that one or more of the following problems have occurred:

  • Faulty battery pack.
  • Faulty alternator.
  • High battery discharge due to short circuit in wiring or electrical components.
  • High resistance in cable between alternator and battery.
  • Open circuit or short between alternator and control module.
  • Improperly installed accessories, e.g. alarm, car stereo, lights.
  • Sometimes faulty PCM module is the cause.

How to fix or reset OBD-2 code P0563

Some suggested steps for troubleshooting and fix the error code P0563:

  1. Make sure the battery is fully charged and in working order.
  2. Check the alternator.
  3. Inspect wires and connection connectors for damage.
  4. If the error persists, check the PCM module.

Diagnose and repair of problems

The first step in the troubleshooting process for any malfunction is to review the Technical Service Bulletins (TSB). For known problems with a particular vehicle.

The most common cause of trouble code P0563 is low battery voltage, and a charging system malfunction (faulty alternator). When checking the alternator, it is worth paying attention to its belt. It is the belt that is often the cause of the malfunction.

Checking the battery

Make sure that the battery is fully charged, check for signs of acid buildup on the terminals. Also, check that the terminal connections are secure and if necessary clean, repair, or replace the terminals.

Make sure all power consumers are turned off or disconnected and check the system to make sure the battery is not running low. If a leak is found, isolate all circuits one at a time to determine the culprit, and repair if necessary.

Check the battery under load and replace it if a defect is found. Clear all codes and retest the system to make sure the fault does not return. If the battery is operating according to the specifications in the manual. No fault is found in the wiring, proceed to the alternator test.

Testing the alternator

Make sure all wiring is connected, connect the OBD-2 scanner, and check the alternator output while the engine is running. If the alternator output reading is 14 volts or less, the alternator may be faulty, but you need to check the wiring.

Check all primary and secondary ground connections to make sure all connections are good. Poor grounding often leads to overheating at the connection points. Therefore, check all cable lugs for signs of burning, scorching or sparking. Repair if necessary.

Note that the alternator output should be within 14.2V when the engine is running at idle. And about 14.6 V when the engine speed increases.

If the code holds and there is no fault in the wiring, but the charge rate is not as specified, the alternator is faulty. However, this must be confirmed with a scan tool. If a scanner is not available, a multimeter should be used to confirm the alternator malfunction.

Intermittent malfunction or PCM failure

The actions described above apply to most vehicles and should eliminate code P0563. However, if the code returns, it is likely that an intermittent fault may be present. In this case, you will have to allow the problem to worsen before accurate diagnosis and final repair can be made.

There is also the possibility that abnormal system voltage could damage the PCM if the PCM is controlling the alternator output. If this is the case, the PCM should be replaced, reprogrammed, and the vehicle checked. To see if any codes come back.

On which vehicles does this problem occur most frequently

Fault code P0563 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Audi (A6)
  • Chevrolet
  • Chrysler (300C, Pacifica)
  • Citroen (C4)
  • Daewoo (Matiz)
  • Dodge (Neon)
  • Ford (Expedition, Focus, Transit)
  • Honda (Civic)
  • Hyundai
  • Jeep
  • Kia
  • Land Rover
  • Lifan (Solano)
  • Mazda (6)
  • Mercedes-Benz
  • Peugeot
  • GAZelle
  • LADA (Kalina, Niva, Priora)
  • UAZ (Patriot)
  • VAZ (2107, 2110, 2112, 2114, 2115)

Fault code P0563 can sometimes be found with other errors. The most common are the following: P0513, P0560, P0561, P0562, P0581.


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