U0698Lost Communication With Coolant Pump E
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Coolant pump E continues the generic letter series of auxiliary electric pumps after A to D. Mercedes-Benz uses it for the second coolant pump in its low-temperature circuit: bulletin LI20.00-P-076708 lists U0698E4 and U0698E5 in the powertrain control unit N127 together with other LIN devices such as fan, charge-air cooler pump and high-temperature control valve. Affected are the GLC (254) and the 2024 facelift GLE (167); drivers see the check engine lamp, a coolant warning and the radiator fan at maximum speed. On the GLC with control unit software 22A the fix is a software update; otherwise connectors, wiring and intermediate connections on the LIN bus are checked. Pumps like Bosch's PDE take speed commands via PWM or LIN and diagnose themselves.
- What you may notice
- Check engine light
- Coolant warning message
- Radiator fan running at full speed
- Likely causes
- LikelyPowertrain control unit software (Mercedes N127 version 22A)
- PossibleLIN wiring or intermediate connector chafed or corroded
- RarePump E electronics failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.