P0562
UniversalSystem Voltage Low
The vehicle’s control system detected voltage in the electrical system that was lower than expected. The battery and charging system supply power to the vehicle’s computers and electrical components. Low voltage can cause warning lights, starting trouble, or electrical functions to behave unpredictably, but this code alone does not identify a failed part.
⚠️ Before You Begin (Safety First)
If the vehicle stalls, will not start reliably, or has dimming lights or warnings that suggest steering or braking assistance is affected, stop somewhere safe and arrange for help. Avoid driving if essential systems are not working normally. Do not disconnect the battery while the engine is running.
Common Symptoms
- There may be no noticeable symptoms if the voltage drop was brief or the vehicle is operating normally.
- Slow cranking or difficulty starting can occur if the battery has insufficient charge or the charging system is not restoring it.
- Dim or fluctuating lights and other electrical accessories behaving inconsistently can occur when system voltage is low.
- Warning lights or multiple control-system codes may appear because vehicle computers can be affected by low supply voltage.
- The engine may stall or the vehicle may limit some functions if voltage becomes too low for systems to operate reliably.
Common Causes
- A discharged, worn, or damaged battery may not maintain adequate system voltage.
- A charging-system problem may prevent the battery from being replenished while the vehicle runs.
- Loose, corroded, or damaged battery connections, grounds, or wiring can restrict electrical flow.
- A damaged or slipping drive belt may interfere with operation of belt-driven charging equipment, where applicable.
- An electrical load left on, a charging issue, or an unintended battery drain may reduce battery charge.
Diagnostic Steps
- Note when the code appeared and whether the vehicle had a slow start, dim lights, or recently needed a jump-start; this context can help guide diagnosis.
- With the vehicle off and the key removed, visually check that accessible battery connections are secure and free of obvious corrosion or damage. Do not bridge terminals with tools.
- Look for an obviously damaged or loose drive belt only if it is readily visible and safe to inspect with the engine off; keep hands and clothing away from moving parts.
- Check whether interior or exterior lights or accessories may have been left on, and switch them off before the next start.
- If the code returns or starting and electrical problems continue, arrange battery and charging-system testing rather than replacing parts based on the code alone.
When to Call a Professional
A technician can check stored data and related codes, test the battery’s condition, and assess charging-system operation under appropriate conditions. Electrical connection and ground voltage-drop tests can help distinguish a weak battery or charging problem from wiring resistance. The exact test procedure depends on the vehicle.
Compare component listings
Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.
Commonly Asked Questions
Does P0562 prove that the alternator has failed?
No. It reports a low-voltage condition, which can result from the battery, charging system, electrical connections, wiring, or another cause. Testing is needed to identify the source.
Can a weak battery trigger this code?
Yes. A discharged or deteriorated battery can contribute to low system voltage, including during starting. A battery test and charging-system checks help distinguish the possibilities.
Is it safe to keep driving with P0562?
It depends on how the vehicle is behaving. If it stalls, starts unreliably, or essential electrical functions are affected, stop safely and arrange for assistance. A technician should assess a recurring code.
Why might several warning lights appear with this code?
Vehicle control modules need stable electrical power. Low voltage can affect multiple modules or produce additional codes, so those codes should be interpreted alongside the voltage condition.
Should I clear the code after charging the battery?
A recharge may address a temporary low-charge condition, but the cause should still be considered. If the code returns, or the battery does not stay charged, have the battery, charging system, and connections checked.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.