P0560

Code

ISUZU P — Powertrain

System Voltage

Brand: ISUZU

Type: P — Powertrain

Views: UK: 16 EN: 18 RU: 14

AI status

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Page language: EN

Causes

Weak or discharged battery
Failed or slipping alternator/charging regulator
Broken or loose alternator drive belt
Corroded/loose battery terminals or ground connections
Blown main fuse or fusible link
Damaged wiring or connectors to battery/alternator/PCM

Symptoms

Battery warning lamp or charging system indicator illuminated
Dim or flickering headlights and interior lights
Hard starting or no-start condition after accessory use
Electrical accessories behaving intermittently or failing
Possible engine stalling or poor idle if PCM loses stable supply
Stored or recurring P0560 (may set additional voltage-related codes)

What to check

Visually inspect battery terminals, cables and ground straps for corrosion, tightness and damage
Measure battery voltage at rest (key off), key on engine off (KOEO) and with engine running
Check charging system voltage at battery with engine at operating RPM (approx. 13.5–14.8 V expected)
Inspect alternator drive belt for tension and condition
Check main fuses and fusible links between alternator/battery and PCM
Check voltage supply pins at PCM/ECM and ignition-controlled power feeds

Signal parameters

Battery at rest (key off): ~12.4–12.8 V (healthy)
Key on engine off (accessory/ignition): ~12.2–13.2 V depending on accessories
Charging voltage (engine running): ~13.5–14.8 V typically
Voltage under cranking: often drops to ~9.5–11.5 V depending on battery/starter
System events that may trigger code: sustained voltage below ~11–11.5 V or above ~16 V, or rapid fluctuations

Diagnostic algorithm

Record freeze-frame data and all stored/related DTCs with a scan tool.
Visually inspect battery, terminals, ground straps, alternator connector and main fuses/fusible links.
Measure and record battery voltage at rest. If below ~12.0 V, charge battery and retest or perform a battery load test.
With key on (engine off) measure voltage at battery and at PCM power supply pin(s) to check for feed/ignition faults.
Start engine and measure charging voltage at battery and alternator B+ terminal at idle and ~2000 rpm. Compare to spec.
If charging voltage low or high, inspect alternator belt, connectors and regulator. Bench-test or replace alternator if faulty.
If voltage at battery is good but PCM supply is intermittent, trace wiring from battery/main fuse to PCM, check relays/ignition switch and repair any wiring or connector faults.
Repair/replace failed components (battery, alternator, wiring, fuses) as indicated by tests.
After repairs clear codes, perform functional test and road drive while monitoring system voltage to verify the fault does not return.
If issue persists, consult the vehicle-specific service manual for manufacturer diagnostic procedures and PCM power circuit diagrams.

Likely causes

Poor battery state of charge or bad battery
Alternator not charging (bad alternator or voltage regulator)
Loose/corroded battery/ground connections
Blown main fuse or fusible link in charging feed
Intermittent wiring/connector fault to PCM power input

Fault status

⚠️ Status

Stored when the engine control module detects supply voltage outside expected thresholds or intermittent power to the module. May be logged as a current or pending fault depending on occurrence and persistence.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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