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Code P0562. Causes, Symptoms, Diagnosis and Repair

The code P0562 is a generic code with several possible causes, ranging from a faulty relay to a damaged alternator. In this guide, you will learn what the P0562 code means, what causes it, and how to fix it.

This fault code is defined as a “voltage system fault”. Sets when the powertrain control module (PCM) detects low battery voltage.

Operation of the Electric Charging System

The charging system’s job is to maintain an ideal voltage level (usually around 14.1V to 14.4V DC) when the vehicle is idle and with the lights off.

The PCM (powertrain control module) monitors the ignition power circuit to determine if the charging system is operating properly.

If the voltage is too low (below 10V for more than 60 seconds) or lower than the car’s requested voltage, error code P0562 will be set.

Error code P0562 It is defined as low system voltage. It is a strictly electrical issue. This error code is generic, meaning it applies to all cars, regardless of make or model.

What is Code P0562?

Fault code P0562 means “Low system voltage“. If your vehicle has this problem, you may see the check engine light come on, or experience other symptoms caused by this low voltage.

The battery provides the primary power source for most vehicle systems, including the engine control module. If there is a problem with this power supply, it will also affect the performance of the engine and other major components.

The P0562 trouble code appears when the battery voltage input to the Engine Control Module (ECM) drops below normal.

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

If the voltage is too low, a fault code will be set. This code will also appear if there is no voltage, but there should be.

This can happen for a variety of different reasons, but usually occurs when the battery is running out of power or if there is a loose connection on the battery.

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Symptoms of a P0562 Code

In most cases, you are likely to notice several symptoms when your vehicle has been affected by a fault code P0562. The first thing you will notice is that your vehicle is not starting correctly.

This can be caused by a low battery charge or a faulty alternator.

Another symptom you’ll likely notice is the illumination of a check engine light on your dashboard. You may also notice that the headlights are dimmer than normal, especially at night.

This can cause a serious safety problem, so it is important that you inspect your vehicle as soon as possible if you encounter any of these problems.

Here is a list of the most common symptoms associated with a P0562 OBD code:

  • Check Engine light is activated.
  • The red battery charge indicator lights up.
  • Difficulty starting the car.
  • The vehicle does not start at all.
  • general lack of electrical power.
  • Engine stalling.
  • Dim headlights.
  • Frequent or unpredictable engine stoppage.
  • Sudden, erratic, or unpredictable shifts in the automatic transmission.

A P0562 trouble code refers to a voltage drop between the battery and the alternator, which means your car’s computer has detected a problem with the charging system.

Causes of a P0562 Code

There are several different causes for this fault code, but in most cases, it is triggered by a problem with your vehicle’s charging system.

When it comes to this problem, there are only two main components that can cause it: the alternator and the battery. Let’s see below a list of common causes of code P0562:

  • Loose battery connections.
  • Bad contact on the battery terminals due to corrosion.
  • Battery with low charge level.
  • Defective alternator.
  • Damaged alternator belt.
  • Damaged fuse in the charging system.
  • Broken, open, or shorted charging system wiring.
  • Damaged battery.
  • High battery discharge due to short circuits in wiring or electrical components.
  • Accessories installed incorrectly, e.g. alarm, car stereo, lights.
  • Sometimes faulty PCM module is the cause.

To determine the exact cause, you will need to perform some tests.

How to Diagnose Code P0562

The most common cause of the P0562 trouble code is low battery voltage and a malfunctioning charging system (faulty alternator).

When checking the alternator, it is worth paying attention to its belt.

Recommended tools for diagnosis

  • Diagnostic OBD Scan Tool.
  • Digital multimeter.
  • Basic hand tools.
  • Car repair manual.
  • Electrical contact cleaner.

Initial inspection

Start by checking the car’s charging system. Start the vehicle and turn on the headlights. It is also advisable to turn on the fan at its maximum speed.

Using your digital volt-ohm meter, you should read the battery voltage. A good reading would be between 14 and 14.7 volts. If you read less than 12 volts or just over 15 volts, the charging system is responsible.

Battery Check

  1. Make sure the battery is fully charged, and check for signs of acid buildup on the terminals.
  2. Also, check that the terminal connections are secure and, if necessary, clean, repair or replace the terminals.
  3. Make sure all power-consuming systems are turned off or disconnected and check the system to make sure the battery is not running low.
  4. If you find a leak, isolate all circuits one at a time to determine the culprit and repair it.
  5. Check the battery under load and replace it if you find any defects.
  6. Clear all codes and retest the system to ensure the fault does not return.
  7. If the battery is performing according to the manual’s specifications and no fault is found in the wiring, proceed to testing the alternator.

Test the battery terminals

P0562 It is usually caused by a loose connection at the battery terminals. To fix this, you will first need to identify which battery terminal is causing the problem.

You can use a multimeter to test the voltage drop between the positive and negative terminals to find out if the battery has lost power.

After you figure out which side of the battery is causing problems, remove that terminal and look for any signs of wear that may be causing the loose connection. The most common culprit here is the corrosion of this connection.

Checking the alternator

  1. Make sure all wiring is connected correctly.
  2. Connect the OBD-2 scanner and check the alternator output with the engine running.
  3. If the alternator output reading is 14 volts or less, the alternator may be faulty, but you should check the wiring.
  4. Check all primary and secondary grounds to make sure all connections are good. Poor grounding often leads to overheating at the connection points.
  5. Therefore, check all wire terminals for signs of burning, scorching, or sparks. Repair if necessary.

If the code holds and there are no wiring faults, but the charge rate is not as specified, the alternator is defective. However, this needs to be confirmed with a scan tool.

If the scan tool is not available, a multimeter should be used to confirm the alternator malfunction.

Intermittent PCM malfunction or failure

The actions described above apply to most vehicles and should clear the P0562 code. However, if the code returns, there is likely an intermittent failure.

In this case, you will need to allow the problem to worsen before an accurate diagnosis and final repair can be made.

There is also a possibility that abnormal system voltage could damage the PCM if the PCM is controlling the alternator output. If this is the case, the PCM must be replaced, reprogrammed and the vehicle serviced.

How to Fix Code P0562

It is important that you perform a complete system diagnosis before replacing any part. Otherwise, you could replace something that wasn’t damaged, and you wouldn’t solve the problem.

Some suggested steps to troubleshoot and fix error code P0562:

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

Common Errors When Diagnosing Code P0562

A hasty misdiagnosis of error code P0562 is the most common mistake made with this car system.

The problem is mainly assumed to be with the faulty battery or alternator motor. However, you should check the entire system before proceeding with a replacement or repair.

Above all, pay special attention to the alternator belt. Many times the entire system is checked without finding the fault, with the stretched alternator belt being the source of the problem.

Is Code P0562 Serious?

You may think that the code P0562 It is not a serious code, especially if you do not notice any major symptoms. However, it is important to solve the problem immediately because this type of failure can cause an accident.

If the vehicle were to stop suddenly in heavy traffic, it could cause problems. This situation could easily occur if the voltage was too low.

Additionally, it could prevent the vehicle from starting again, leaving you stranded on the road.


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The code P0562 shows that the system voltage is low and is an error set by the powertrain computer. When the system sees that the voltage is too low, the code is set.

For the vehicle and all electrical systems to function properly, there must be sufficient power. With the engine off, the battery can power some things that can light up.

However, once the engine is running, the alternator is responsible for supplying this power. It must maintain an appropriate amount of voltage, typically between 14 and 14.5 volts.

When trying to diagnose the P0562 code, take note of any other codes recorded. It also helps to analyze freeze-frame data.

Examine the voltage coming from the B+ terminal of the alternator and watch for voltage drops between the ground terminals and the battery power.

It is also useful to compare the voltage requested by the charging system with the actual voltage numbers. If you’re having trouble seeing something, examine the difference at various RPMs, throttle positions, and engine load.

If you want to know other articles similar to Code P0562. Causes, Symptoms, Diagnosis, and Repair you can visit the category Fault Codes.


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