What Does P0560 Mean?
The ECM has detected an unstable or abnormal system voltage reading on its internal battery voltage monitoring circuit. The system voltage is fluctuating outside normal operating parameters (typically 11.5-14.8V) or exhibiting erratic behavior. This general voltage malfunction code differs from specific high/low voltage codes in that it may encompass transient spikes, dropouts, or instability rather than a steady over- or under-voltage condition.
Common Causes
35%
Failing alternator with erratic voltage output, worn brushes, or intermittent voltage regulator
30%
Loose or corroded battery cable terminals causing intermittent voltage drops under load
20%
Weak or failing battery unable to maintain stable voltage under varying electrical loads
15%
Poor engine or body ground connection causing voltage fluctuations seen by the ECM
Diagnostic Steps
1
Step 1: Perform a battery load test. The battery should maintain above 9.6V during a 15-second load test at half the CCA rating. A weak battery is the most common cause of voltage instability.
2
Step 2: With the engine running, measure alternator output voltage at the battery terminals. Normal output is 13.5-14.8V at idle. Monitor for fluctuations; the voltage should remain steady within 0.2V. Erratic readings indicate a failing alternator or voltage regulator.
3
Step 3: Inspect battery cable terminals for corrosion, looseness, or green/white buildup. Clean terminals with a battery terminal brush and apply dielectric grease. Check the negative cable-to-engine ground strap and body ground for tightness and corrosion.
4
Step 4: Perform a voltage drop test on the positive and negative battery cables while cranking. Positive side voltage drop should be below 0.5V, and negative side below 0.2V. Excessive voltage drop indicates cable resistance.
5
Step 5: If the battery and alternator test good, check the main fuse box and ignition switch for intermittent contact. Monitor ECM voltage with a graphing multimeter during a test drive to capture transient dropouts.
Estimated Repair Cost
$20 - $500
Parts + labor, varies by vehicle and location
The ECM has detected an unstable or abnormal system voltage reading on its internal battery voltage monitoring circuit. The system voltage is fluctuating outside normal operating parameters (typically 11.5-14.8V) or exhibiting erratic behavior. This general voltage malfunction code differs from spec...
The most common cause of P0560 (Power Steering Pressure Sensor Circuit Intermittent) is: Failing alternator with erratic voltage output, worn brushes, or intermittent voltage regulator
Typical repair costs for P0560 range from $20 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Unstable system voltage can cause erratic behavior of multiple electronic control modules, including engine management, ABS, and airbag systems. In severe cases, voltage dropouts may cause engine stalling or loss of electronic power steering.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0560 to identify the root cause.
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Quick Info
Category
Powertrain
System
Charging / Electrical System
Difficulty
Type
Generic (SAE)
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