P2559Engine Coolant Level Sensor/Switch Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P2559 is the high-voltage fault in the circuit of the coolant level sensor or switch. In the Deutz EMR L1 code list it appears as P2559-12 under SPN 111 meaning the line is shorted to battery plus; Deutz keeps open circuits under P2558 on that input, so a high reading there really points to contact with a positive feed. On other designs, especially simple float switches with a pull-up resistor, a broken wire could also produce a high level, so the maker's circuit logic decides what to measure. Wiring near the expansion tank often runs close to battery or fan feeds, which makes chafing a likely cause. P2558 covers the low side, P2557 an implausible but in-range value, P2556 the general circuit fault and P2560 a genuinely low coolant level. Until fixed, the low coolant warning may stay silent.
- What you may notice
- Low coolant warning does not work
- Warning lamp or message for the level sensor
- Likely causes
- LikelySignal line chafed against a positive feed
- PossibleOpen circuit on pull-up type switch designs
- RareLevel sensor internally faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.