Code P0562 is a general error code, i.e. it applies to all car models from around the year 2000 onwards. It is a common error code, and we have used our automotive technicians to answer your questions on how you can rectify it in the fastest and most cost-effective way.
What does the P0562 code mean?
The code P0562 is often stored in the engine control unit or transmission because the first letter begins with “P”, which means “Powertrain”. P0562 is stored when the engine control unit detects a low voltage in the electrical system.
Normally modern cars use a 12-volt system. When the engine is turned off, there should be 12 volts in the system, and when the engine is running, the alternator should charge the car with 13.5-14.3 volts.
Code P0562 means that the motor control unit detects a voltage below 10 volts for 1 minute when the motor is running in the electrical system. Common causes are a low charge from the alternator or a poor car battery. It can also be caused by poor wiring.
|Code||Description||Common Causes||Possible Solutions|
|P0562||System Voltage Low||Bad alternator |
Bad Car Battery
Low Charge level
Ground wiring problem
Faulty wirings to the ECM
|Charge your car battery
Repair wirings to the alternator
Repair defective ground wirings
Replace blown fuses
Repair wires to ECM
Replace car battery
Replace engine control unit
Low voltage can cause many strange and different symptoms in your car. Writing down all these symptoms would take forever, so I will list the most common symptoms of the P0562 code. Sometimes there could be a problem with the power cable to the engine control unit, and you will get no symptoms except a check engine light.
- Electrical functions do not work properly
- Engine stops
- The engine won’t start
- Check engine light
- Battery light/charging light
- Low performance of the engine
- Shifting problems
The most common problem is that there is a charging problem or a battery problem when the P0562 occurs. The trouble code could also be set if there is a problem with the wirings to the power control unit.
The most common reason for the P0562 error is a charging problem or a battery problem. There may also be a problem with the wiring to the power control unit.
- Bad alternator (Most common)
- Bad alternator wirings
- Blown fuses
- Bad car battery / low charge level
- Ground wiring problem
- Defective engine control unit
- Faulty wirings to the engine control unit
When diagnosing this fault code, always check that the generator charge is low before replacing any parts. If you want to know how to diagnose this error code, go further down this article.
- Charge your car battery
- Repair wirings to the alternator
- Repair defective ground wirings
- Replace Alternator
- Replace blown fuses
- Repair wires to the engine control unit
- Replace car battery
- Replace engine control unit (Rare)
How to diagnose the P0562 code
This is how an experienced automotive technician would diagnose this fault code. To follow this guide, you may need some knowledge of automotive electrics and the tools necessary. Warning: Beware of rotating parts if you are measuring parts while the engine is running.
Connect a car battery charger
You should always start by connecting a car battery charger when troubleshooting your car and while your OBD2 code scanner is connected. The OBD2 scanner requires the ignition to be on, and it will quickly discharge your battery without a charger.
Connect your OBD2 code scanner
Connect your OBD2 scanner to check the P0562 code. Look for other error codes that might tell you a bit more about the low voltage problem.
Go to Live Data Parameters to find a column where you can see the voltage for the engine control unit. Disconnect the car battery charger and start your car to check the voltage parameter.
If the voltage drops below 12 volts while the engine is running, you most likely have a charging problem; you now just need to find it. If the voltage seems to be good, you can clear the error code and try the car to see if it disappears. Remember that the problem with charging the alternator can be an intermittent problem and your car may die while driving if it does not charge properly.
Check the charging voltage
If you have seen in the scanner tool that the voltage is low, you need to check if it is the whole car that is receiving this low voltage or just the engine control module. Let your car idle and don’t connect the car battery charger.
Check the voltage on the battery between the positive and negative terminals while the vehicle is running. Use a digital multimeter. Measure between the positive and negative terminals of the battery and the body mass. You could also try measuring on the large B+ wire on the alternator to see if you can detect a voltage drop.
You should get a value of 13.2-14.6 volts when the engine is idling. If you get below 13 volts, your alternator is most likely not charging as it should. If you get a good value here and a bad one with the OBD2 code scanner, you most likely have a problem with the wiring to your engine control unit.
Check for blown fuses
Check whether the fuses on the alternator or engine control unit are blown. Make sure that all fuses are in good condition.
Check ground wirings
To test the ground wiring, place a jumper cable between a good ground point on the engine and connect it to the negative pole of the battery. Check your voltage if you get different values when connecting. Also, try to connect it to the body ground. If you get a better charge value when the jump lead is connected, there could be a grounding problem.
Check wirings to the alternator
An alternator often has one large wire and 1 to 4 small wires. You can check if you get the right voltage on the big wire and if the battery has a different value.
If you get 14 volts on the large B+ alternator cable and 12 volts on the battery, there may be a problem with the B+ cable or a blown fuse.
To check the small wires, you need to get a circuit diagram for your car to be able to make a correct measurement. To get a circuit diagram, you can either search the internet or call your dealer.
There is often a 12-volt supply line and a line to the charging light on the dashboard, but it is always best to check with a circuit diagram. What you could do is to check that at least one wire is supplied with power while the engine is running.
Give the alternator a hit
If the voltage is low and you have checked all wiring to the alternator, you can try hitting the alternator with a hammer to see if the voltage rises. If the voltage rises when hitting the alternator with a hammer, the carbon in the alternator is most likely worn out.
You can either replace the carbon (if possible) or preferably replace the entire alternator.
There may also be other problems with the alternator, and if you have checked all the wiring in the above list, there is most likely a problem with the alternator.
Recommended Tools to Fix P0562
- Read the trouble codes: FOXWELL NT301 Scan Tool. With this tool, you can check the alternator charging in live data.
- Car battery charger: NOCO Genius G3500 6V/12V Smart Battery Charger
- Measure the voltage: Digital multimeter
- Clean connector plugs: Electric Cleaner
If you have any other questions about the P0562 code, comment down below and I will answer you as fast as possible. If you have any other car questions you are welcome to ask us at our homepage.
To find all OBD2 codes. Check our OBD2 Code List.