P2559 code meaning
Engine Coolant Level Sensor/Switch Circuit High
What P2559 means
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.
P2559 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2559
- Low coolant warning does not work
- Warning lamp or message for the level sensor
Common causes of P2559
- Most likelySignal line chafed against a positive feed
- PossibleOpen circuit on pull-up type switch designs
- Less likelyLevel sensor internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant level sensorSensor wiring
What each part of P2559 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 59 | The exact fault in that area. |
What to do next
- Note P2559 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2559
What does P2559 mean?
P2559 means "Engine Coolant Level Sensor/Switch Circuit High". P2559 is the high-voltage fault in the circuit of the coolant level sensor or switch. It is a generic code, so it means the same on every make.
Is it safe to drive with P2559?
P2559 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2559 fail an emissions test?
P2559 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2559 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2559 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.