A professional mechanic will use an OBD-II scanner to diagnose the P0562 code. Here are the steps the mechanic would take to troubleshoot:
- Check for additional codes
Your mechanic will first use an OBD-II scan tool to check if there are other codes related to the charging system. This could help pinpoint the root cause of the P0562 issue or identify other problems that might need to be addressed first.
- Check the charging system voltage
Your mechanic will then turn on the vehicle and switch on the headlamps. They may use the high-beam lights and turn up the blower to increase the load on the charging system. Then they’ll check the battery voltage.
A good voltage reading is something between 13.2 to 14.7 volts. If the voltage reading is less than 12 volts or more than 15 volts, there’s a problem with the charging system.
- Inspect PCM connections
If the code P0562 persists, they’ll inspect the PCM’s wiring, connectors, and terminals. They’ll check for signs of corrosion, burning, or fraying, which can compromise circuit integrity.
- Measure the PCM voltage
Your mechanic will check the ground and system voltage at the PCM if the problem continues. After safely disconnecting the harness that goes to the PCM, they’ll turn on the ignition switch and test the PCM ignition feed circuit with a DVOM. They’ll also use a test light to check the PCM ground.
It’s possible that the PCM needs to be updated or replaced if everything else is fine.
What would be a common mistake when diagnosing P0562?
The most common mistake is an incomplete P0562 diagnosis.
A bad battery or starter is often assumed to be the culprit, especially if you have trouble starting the vehicle. If these aren’t the root cause, replacing either component won’t solve the underlying problem, and the fault code will return.
So always ensure that you get a complete diagnosis. This way, you won’t end up replacing parts that aren’t broken or waste money.