OBD-II code · Powertrain (generic, extended)
P2559 Engine Coolant Level Sensor/Switch Circuit High
Coolant level sensor signal voltage above the upper limit — short to reference voltage or open signal return.
Is it safe to drive with P2559?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to reference voltage
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Level Sensor, Sensor Wiring
Related codes
- P2556Engine Coolant Level Sensor/Switch Circuit
- P2557Engine Coolant Level Sensor/Switch Circuit Range/Performance
- P2558Engine Coolant Level Sensor/Switch Circuit Low
- P255APTO Speed Selector Sensor/Switch 2 Circuit/Open
- P255BPTO Speed Selector Sensor/Switch 2 Range/Performance
- P255CPTO Speed Selector Sensor/Switch 2 Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.