P0562System Voltage Low
- Generic OBD-II code · Powertrain
- How the car detects it
- 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. P0562 means the voltage is below its threshold with the engine running, when the charging system should deliver: GM 9 V or less at 400 rpm or more in 400 of 500 samples (about 5 s), type C. Saab's 9-4X modules may switch off temporarily below about 9 V. Many other modules, such as GM's brake module, set P0562 themselves.
- What you may notice
- Battery or charge warning lamp
- Starting problems, dim lights
- Codes in several modules
- Likely causes
- LikelyAlternator or regulator delivering too little
- LikelyBattery faulty (shorted cell)
- PossibleCorroded terminals, ground straps or alternator cable
- RareHigh quiescent current or many consumers at idle
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.