Jeep Wrangler: P0562 – System Voltage Low

Common OBD-II trouble codes include P0562.  It’s a general code, which means that it means the same thing for any vehicle, including the Jeep Wrangler.  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 Jeep Wrangler


Índice de Contenido
  1. P0562 Quick facts
  2. P0562 Symptoms:  Jeep Wrangler
  3. P0562 Causes + Diagnosis:  Jeep Wrangler
    1. 1. Alternator
    2. 2. Voltage regulator
    3. 3. Wiring a battery
    4. 4. Bad Battery
    5. 5. Massive Battery Depletion
  4. Conclusion:  P0562 Jeep Wrangler

P0562 Quick facts

  • P0562 is triggered whenever your Wrangler’s voltage drops below 10 volts for over a minute straight.
  • With the engine running, ideal voltage should not exceed 14 volts
  • There is usually no obvious sign.
  • The most common cause is a defective alternator.


P0562 Symptoms:  Jeep Wrangler

Jeep Wrangler P0562 Symptoms

If P0562 is the only code your Wrangler has, there typically aren’t any noticeable symptoms.The check engine/battery lights are the only symptoms.  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 Wrangler wouldn’t even turn back on if you tried.  You won't be able to turn the starter on again because your battery has drained.


Below are the top P0562 symptoms:

  • Make sure to check the engine licenseGht– This is the most common symptom, and often the only symptom.
  • Warning/Low Battery–  You’ll more than likely get the battery light with this code.
  • Poor Fuel Economy–  This can occur when your Wrangler’s engine and computer are not getting enough voltage.  The computer may be unable to adjust the ignition timing, fuel mixture or air/fuel mix in real-time.  The spark may also be weak.
  • It's a mistake– Without enough voltage to fire the spark plugs properly, the motor will sputter and cough.  If there is enough misfire, the check engine lamp may flash.
  • Shifting Problems– 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:  Jeep Wrangler

These are some of the leading causes for P0562.


1. Alternator

Wrangler P0562 Diagnosis
An alternator typical

The alternator supplies voltage to the battery and to all of your Wrangler’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 shops will test your alternator free of charge.  They will also be able to replace your alternator if you need it. Quite affordable.  While you're at it, make sure to replace the serpentine belt.

Jeep Wrangler Alternator Diagnosis


2. Voltage regulator

To prevent overloading, the voltage regulator makes sure that only a set voltage is passed to the charging system.  This regulator prevents too much voltage from flowing and can throw out P0562.


3. Wiring a battery

There’s a lot of wiring associated with your Wrangler’s charging system.  The following wiring should be checked for corrosion, fraying, or poor connections.

  • Batterie 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 the Alternator and Battery– Take a look at the wiring from the alternator to the battery.  Examine the wiring from the alternator to battery for damage or fraying.  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.
  • Connect PCM to an Alternator– Check to see if the wiring going from the alternator straight to the PCM looks good.  The wiring harness has a lot of distance to travel and can be damaged even if it is well protected.  You should look for fraying at the junction of the wiring harness and the PCM.  This is the most likely issue with wiring, and should only be pursued if all else fails.


4. Bad Battery

While a bad battery can throw P0562, it’s not nearly as likely as an alternator or wiring issue.  It is important to have the battery tested before you replace it.


5. Massive Battery Depletion

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.  It can happen when something is shorted and pulls too much current.

Diagnoses for Jeep Wrangler battery drain


Conclusion:  P0562 Jeep Wrangler

Finding P0562 is not easy.  It’s usually the alternator that is at fault.  You can add anything to this article.  We wish you the best with your Wrangler repair!


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