Powertrain
generic / SAE
P2556
Engine Coolant Level Sensor/Switch Circuit
General electrical fault on the engine coolant level sensor/switch circuit. Many vehicles use a simple float-switch in the expansion tank, others use a continuous-level analog sensor. With the input invalid the ECM cannot warn for low coolant before overheating starts.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 56
Possible causes
- Open or shorted wiring to the sensor high
- Corroded connector at the expansion tank medium
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 40–250 €
- Estimated time: 0.2–1 h
- Component: coolant level sensor
- Component: sensor wiring
- MIL / check engine light
Sources
References
sae:J2012