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P0562 — System Voltage Low
SeriousElectricalPower derate likely — plan to stop soon
Seen on: Heavy Truck
System Voltage Low. Common causes: Battery voltage low.
Don't risk it — get a diesel tech on the truck.
Look up listed providers near you and give them this code when you call.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Battery voltage low
- Weak battery
- charging fault
- parasitic drain
First moves (roadside)
- Perform battery load test
- check alternator
- check for parasitic draws
FAQ
What does P0562 mean?
System Voltage Low. Common causes: Battery voltage low.
How serious is P0562?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of P0562?
The most common cause is: Battery voltage low. Other possibilities include Weak battery; charging fault; parasitic drain.
Can I keep driving with P0562?
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
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General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.