Honda Odyssey: P0562 – System Voltage Low

The OBD-II common trouble code P0562 can be found in the OBD-II manual.  It’s a general code, which means that it means the same thing for any vehicle, including the Honda Odyssey.  P0562 This indicates the system voltage has dropped below 10 volts continuously for at least one minute.  With the engine running, the system voltage should be 14.1-14.4 volts, and it’s typically caused by a bad alternator.  It’s very common to get the battery light with P0562.

P0562 Quick Facts

• P0562 is triggered whenever your Odyssey’s voltage drops below 10 volts for over a minute straight.
• With the engine running, ideal voltage should not exceed 14 volts
• There may not be any obvious symptoms.
• Most often, it is caused by an alternator problem.

P0562 Symptoms:  Honda Odyssey

If P0562 is the only code your Odyssey has, there typically aren’t any noticeable symptoms.Other than the check engine/battery lamp.  If your battery voltage falls too low, you may experience symptoms.

If you do experience symptoms, it’s due to battery drain.  it is very likely that your Odyssey wouldn’t even turn back on if you tried.  It will be impossible to start the starter once again because your battery has drained.

These are some of the more common symptoms for P0562:

• Verify Engine LiabilityGht– This is the most common symptom, and often the only symptom.
• Warning/Low Battery Light–  You’ll more than likely get the battery light with this code.
• Poor Fuel Economy–  This can occur when your Odyssey’s engine and computer are not getting enough voltage.  This could mean that the computer is unable to adjust ignition timings or fuel mixtures in real-time.  Oder, it may be too weak.
• It's a mistake– Without enough voltage to fire the spark plugs properly, the motor will sputter and cough.  If the misfire gets severe enough, the check engine light might even start to flash.
• Probleme shifting– Today’s modern automatic transmissions are computer controlled.  Without enough voltage getting to them, they won’t be able to respond to the engine RPM and vehicle speed in a timely manner.
• Won’t Start– A very common situation with P0562 is running the vehicle and everything is operating fine, and the check engine light comes on (battery light too, usually).  You get the vehicle home and when you go to drive it again it won’t start.  You know it's a problem with the alternator.  

P0562 Causes + Diagnosis:  Honda Odyssey

Below are the top causes of P0562.

1. Alternator

The alternator supplies voltage to the battery and to all of your Odyssey’s electrical system while it is running.  It can also cause P0562 if it is damaged.  If it goes all the way bad that’s make diagnosing the code relatively easy.  The vehicle won’t start if it runs too long with a bad alternator.  How long it would take to drain the battery all the way is going to depend on the battery’s age and driving conditions.

It’s when the alternator begins to intermittently fail it can be tricky to diagnose.  Many auto parts stores can test your alternator free of charge.  You can get a replacement alternator at most auto parts stores if yours fails. It is quite affordable.  You should also change your serpentine belt.

Honda Odyssey Alternator Diagnosis

2. Voltage regulator

In order to prevent the charger from overloading, it ensures that the required voltage level is maintained.  This regulator prevents too much voltage passing, and can throw P0562.

3. Wiring of batteries

There’s a lot of wiring associated with your Odyssey’s charging system.  Check for corrosion, fraying and weak connections.

• Battery terminals– The battery terminals, if left alone long enough, will corrode on any vehicle.  When this happens it’s difficult for the charging system to function properly.
• Wiring an alternator for a battery– Take a look at the wiring from the alternator to the battery.  Check to make sure it is not frayed or damaged.  Be especially careful with parts that come in contact with other parts of the engine.
• Ground Wire– The ground wire that bolts to the negative battery terminal will bolt to the chassis or engine block.  It is important to ensure the connection remains strong and free of corrosion.
• The PCM connection to the Alternator– Check to see if the wiring going from the alternator straight to the PCM looks good.  This wiring has a great distance to travel so it can get damaged.  The wiring harness's connection to the motherboard should be checked for fraying.  It is not the most common wiring problem on our list. You should only investigate it if you are unable to find any other solutions.

4. Bad Battery

While a bad battery can throw P0562, it’s not nearly as likely as an alternator or wiring issue.  Before replacing it, you should test it.

5. Massive Battery Loss

If your vehicle has aftermarket equipment such as a very high watt stereo system, winch, or something else, it could be placing such a heavy load on the charging system that you’re getting P0562.  You must wait at least one minute before you can throw the code.

If something goes wrong, there can be an enormous power loss.  If something goes wrong and draws too much power, this can occur.

Diagnostics for Battery Drainage in Honda Odyssey

Conclusion:  P0562 Honda Odyssey

It can be difficult to track down P0562.  It’s usually the alternator that is at fault.  You can add anything to this article.  Have fun fixing up your Odyssey.