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P0562 OBD-II: System Voltage Low Diagnostic Trouble Code (DTC): P0562

Check Engine Light

P0562 code definition

The P0562 code is stored when the PCM (powertrain control module) detects a vehicle voltage that is lower than requested. If the vehicle voltage level dips below 10.0 volts for 60 seconds or more while at idle, the PCM will store the code.

What the P0562 code means

A vehicle’s charging system works to maintain a normal vehicle voltage level, usually in the range of 14.1 to 14.4 volts DC at idle with headlights turned off. If for any reason, the PCM detects that the vehicle voltage level is too low, the P0562 code will be set, and the MIL (Malfunction Indicator Light) or Check Engine light will illuminate.

What causes the P0562 code?

A number of issues can occur to cause the vehicle voltage level to drop and the P0562 code to be stored, including:

  • One or more poor charging system grounds
  • A defective alternator
  • A large battery drain
  • A defective voltage regulator
  • Faulty wiring or connector(s) to the alternator
  • Defective wiring connecting the alternator to the PCM
  • A faulty B+ battery cable running from the alternator to the battery
  • A defective battery and/or battery cables
  • A faulty PCM (rare)

What are the symptoms of the P0562 code?

There are a few noticeable symptoms that come with a P0562 code being stored. These include:

  • Illumination of the Check Engine light or MIL
  • Illumination of the Battery light
  • Failure to shift properly
  • Lowered fuel efficiency
  • Dying at idle

Most of these symptoms can be associated with other codes and other problems with the vehicle. If your engine dies at idle and fails to start again, you may assume that your battery is at fault. There are numerous issues that could be at work with a P0562 code, though, which is why it’s important to have a professional mechanic diagnose the cause of the issue.

How does a mechanic diagnose the P0562 code?

Using an OBD-II scanner, a mechanic will first find out if there are any other codes stored that relate to the charging system. After this, they will methodically work through potential causes for the code being stored. If a problem is found, such as a poor charging system ground, they will fix it, clear the code, and then retest it to ensure that they’ve found and repaired the problem.

Common mistakes when diagnosing the P0562 code

The most common mistakes involving the P0562 is a rushed misdiagnosis. Often, it’s assumed that the problem is a faulty or dead battery or an issue with the starter. Replacing either will not keep the code from storing and will not solve issues with stalling and other symptoms.

How serious is the P0562 code?

If the vehicle voltage level dips too low, the vehicle may stall at idle and may not be able to start again. For this reason, it’s important to address the problem immediately to ensure your safety and the safety of others when you’re on the road.

What repairs can fix the P0562 code?

A few of the most common repairs for a P0562 code:

  • Repairing or replacing any faulty, loose, or otherwise poor charging system grounds
  • Replacing a bad alternator
  • Replacing a bad battery and/or battery cables, including the B+ battery cable
  • Replacing or repairing a defective voltage regulator
  • Finding and replacing faulty wiring or connectors to the alternator
  • Replacing or repairing a faulty PCM

Additional comments for consideration regarding the P0562 code

In some rare cases, a P0562 code will not have any symptoms other than an illuminated Check Engine light. If this is the case, the problem still needs to be addressed immediately, as the underlying problem could become symptomatic and could leave you stranded. Also, to pass an OBD-II emissions test, you’ll need to ensure that all codes are cleared and that the Check Engine light is not illuminated.

Need help with a P0562 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Sources:

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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