P2558 code meaning
Engine Coolant Level Sensor/Switch Circuit Low
What P2558 means
P2558 reports that the coolant level sensor or switch signal sits too low on the electrical scale. Deutz assigns it on the EMR L1 controller as P2558-14 under SPN 111 and groups two causes together: a grounded line or an interrupted one, which on that input both pull the reading to the bottom. The repair therefore starts by measuring the signal line to ground and checking it for continuity between control unit and tank, including the connector at the expansion tank, which sits in a hot and wet area. Note that a low signal is an electrical finding, not proof that coolant is missing; an actual low level is logged as P2560. On Mercedes passenger cars, by contrast, the level warning is coded P2556-7B. P2559 covers the opposite short to battery, P2557 an implausible value. The coolant level warning can no longer be trusted.
P2558 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 P2558
- Permanent low coolant warning despite a full tank
- No warning possible if the level really drops
Common causes of P2558
- Most likelySignal line shorted to ground
- Most likelyBroken wire or corroded connector at the expansion tank
- Less likelyLevel sensor internally shorted
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 P2558 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. |
| 58 | The exact fault in that area. |
What to do next
- Note P2558 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 P2558
What does P2558 mean?
P2558 means "Engine Coolant Level Sensor/Switch Circuit Low". P2558 reports that the coolant level sensor or switch signal sits too low on the electrical scale. It is a generic code, so it means the same on every make.
Is it safe to drive with P2558?
P2558 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2558 fail an emissions test?
P2558 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 P2558 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 P2558 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.