P0560

Universal

System Voltage Malfunction

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The vehicle’s control system has detected a problem with system voltage. The battery supplies power for starting and electrical operation, while the charging system replenishes it and supports electrical loads when the engine is running. This code does not identify which part or connection is responsible. The vehicle may behave normally, or voltage problems may affect starting, engine operation, or electrical equipment.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the engine stalls, the headlights become very dim, or electrical systems stop working while driving, pull over somewhere safe and arrange assistance. Do not disconnect the battery while the engine is running; this can cause electrical damage.

Common Symptoms

  • There may be no noticeable symptoms if the voltage problem was temporary or has not affected vehicle operation.
  • Slow or difficult starting, or a no-start condition, may occur if the battery is not adequately charged or electrical connections are poor.
  • A battery or charging-system warning light, dim lights, or fluctuating electrical equipment may occur when system voltage is unstable.
  • Rough running, stalling, or other control-system issues may occur if voltage becomes unreliable while the engine is operating.

Common Causes

  • A weak, discharged, or damaged battery may not provide stable power.
  • A charging-system fault may prevent the battery from being replenished or system voltage from being maintained.
  • Loose, corroded, or damaged battery cables, grounds, or other electrical connections can interrupt power or increase resistance.
  • Damaged wiring or an intermittent electrical connection may cause voltage to drop or fluctuate.
  • A temporary low-voltage event, such as a discharged battery, may have been recorded even if the underlying condition is no longer present.

Diagnostic Steps

  1. Check whether the vehicle starts and whether warning lights or electrical problems are currently present; note when they occur to help distinguish a continuing fault from an intermittent one.
  2. With the engine off and the vehicle parked safely, visually inspect accessible battery terminals and cables for looseness, corrosion, or damage. Avoid bridging terminals with tools.
  3. Look for visibly damaged or disconnected wiring and ground connections that are accessible without removing covers or working near moving parts.
  4. If the battery has recently been discharged or jump-started, note that history; it can help explain a voltage-related fault but does not rule out another problem.
  5. Have the battery, charging system, and electrical connections tested if the code returns, the vehicle has starting trouble, or warning lights remain on. Use service information specific to the vehicle.

When to Call a Professional

A technician can review related fault codes and available scan data, test the battery and charging system, and check power and ground connections for excessive resistance or intermittent contact. Testing should follow the specifications for the exact model, year, and engine; the code alone does not prove that the battery or alternator needs replacement.

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Commonly Asked Questions

Does P0560 mean the battery or alternator must be replaced?

No. It indicates a system-voltage malfunction, not a confirmed failed part. The battery, charging system, wiring, and connections should be checked before deciding what needs repair.

Can the vehicle still run with this code?

Sometimes. If the voltage issue is mild or intermittent, the vehicle may seem normal. If voltage becomes unreliable, starting, engine operation, or electrical equipment may be affected.

Can a discharged battery cause P0560?

A discharged battery can contribute to a voltage problem or leave a stored fault. If the code returns after the battery is charged, further diagnosis is needed to find why voltage is not being maintained.

Is it safe to keep driving?

If the vehicle runs normally and electrical systems work, arrange diagnosis soon and watch for changes. Stop in a safe place and seek assistance if the engine stalls, lights become very dim, or electrical systems fail.

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.