P0562 is a very common OBDII trouble code. It’s a general code, which means that it has the same meaning for any vehicle. P0562 indicates that the system voltage is too low. With the engine running, the system voltage should be 14.1-14.4 volts. It’s typically caused by a bad alternator.
P0562 Quick Facts
- P0562 is most commonly seen in Chrysler vehicles (Dodge, Plymouth, Jeep, Chrysler), although it can appear in any make or model with the same meaning.
- P0562 is triggered whenever engine voltage drops below 10 volts for over a minute straight.
- Ideal Vehicle voltage should be around 14 volts with the engine running.
- There are usually no noticeable symptoms.
- It is most commonly caused by a bad alternator.
P0562 Symptoms
Typically, there are not going to be any noticeable symptoms when your vehicle gets P0562 (other than the check engine light). Symptoms do appear if the battery voltage drops too far.
If you do experience symptoms, it is very likely that your vehicle won’t even turn back on if you tried. The battery will have drained too much to engage the starter again.
Here are the most common P0562 Symptoms:
- Check Engine Light– This is the most common symptom, and often the only symptom.
- Low Battery Light/Warning– You’ll more than likely get the battery light with this code.
- Poor Fuel Economy– This can occur when the engine and computer are not getting enough voltage. It may not be able to correct the ignition timing or air/fuel mixture in real time anymore.
- Misfiring– Misfiring goes in hand with poor fuel economy. Without enough voltage to fire the spark plugs properly, the engine will sputter and cough. The check engine light may even begin to flash if the misfire is bad enough.
- Problems 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. This strongly indicates a bad alternator.
P0562 Causes + Diagnosis
Here are the most common causes of P0562:
1. Alternator
The alternator supplies voltage to the battery and to all of the vehicle electrical system while it is running. If it goes bad, then it can cause P0562. If it went all the way bad that’s and easy diagnosis. The car or truck 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 age and driving conditions.
It’s when the alternator begins to intermittently fail it can be tricky to diagnose. Most auto parts stores will be able to test your alternator for free. If you do end up needing a new alternator, they are somewhat affordable. Make sure to change the serpentine belt while you are at it.
2. Voltage Regulator
The voltage regulator ensures that a certain level of voltage passes to the charging system to keep it from overloading. It can keep too much voltage from passing and throw P0562.
3. Battery Wiring
There is a lot of wiring associated with the charging system. You need to check for corrosion, fraying, and poor connections around the following wiring:
- 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.
- Alternator to Battery Wiring– Take a look at the wiring from the alternator to the battery. Look to see if it has been damaged or frayed in any way. Pay particular notice to any part that may be making contact with any other part of the engine.
- Ground Wire– The ground wire that bolts to the negative battery terminal will bolt to the chassis or engine block. Make sure that the connection is strong and corrosion free.
- PCM Connection to Alternator– Check to see if the wiring going from the alternator straight to the PCM looks good. It has a long distance to travel, and while well protected, can still get damaged. Look for fraying where the wiring harness connects to the PCM. This is the least likely wiring issue on this list, so only pursue it if everything else leads to a dead end.
4. Bad Battery
While a bad battery can throw P0562, it’s not nearly as likely as an alternator or wiring issue. You should have it tested before replacing anyway.
5. Massive Battery Drain
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. Remember, it needs to be at least a minute to throw the code.
There can also be a major power drain if something goes wrong as well. This can happen if something shorts out and starts pulling way too much voltage.
Conclusion: P0562
Tracking down P0562 can be tough. If there is anything that you would like to add, please leave a comment below. Good luck!