Powertrain
generic / SAE
P2558
Engine Coolant Level Sensor/Switch Circuit Low
Coolant level sensor signal voltage below the lower limit — short to ground or internal short. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 58
Possible causes
- Signal wire shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 40–250 €
- Estimated time: 0.3–1 h
- Component: coolant level sensor
- Component: sensor wiring
- MIL / check engine light
Sources
References
sae:J2012