Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P0560 System Voltage

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The module measures its own supply voltage. CARB allows other monitors to be suspended below 11 V, and above a maker's threshold only if the voltage itself is diagnosed – that is what these codes record. GM's engine modules and Ford's PCM set them without warning lamp. P0560 is the general code without low/high split, used differently: Saab's 2002 9-5 transmission module sets it below 9 V or above 18 V for 1 s and goes into limp mode; Saab's EDC16 diesel only above 17 V (24 V charger or jump start); the GM-built 9-4X as a low-voltage code. GM's and Ford's engine modules use P0562/P0563 instead.

Likely causes

Battery weak or faulty
Alternator or regulator (under- or overcharging)
Jump start or charger at 24 V
Corroded or loose battery terminals or ground strap

Symptoms

  • Charge warning
  • Transmission limp mode (Saab)
  • Several modules report codes, starting problems

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–600
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

batteryalternatormodule power supplyengine control module

Related codes

P0561P0562P0563P0620P0622

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, law.cornell.edu.