U0698 code meaning
Lost Communication With Coolant Pump E
Network system Generic code U06xx codes Check engine light
What U0698 means
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.
U0698 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0698
- Check engine light
- Coolant warning message
- Radiator fan running at full speed
Common causes of U0698
- Most likelyPowertrain control unit software (Mercedes N127 version 22A)
- PossibleLIN wiring or intermediate connector chafed or corroded
- Less likelyPump E electronics failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant pump eVehicle bus wiring
What each part of U0698 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 98 | The exact fault in that area. |
What to do next
- Note U0698 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 U0698
What does U0698 mean?
U0698 means "Lost Communication With Coolant Pump E". Coolant pump E continues the generic letter series of auxiliary electric pumps after A to D. It is a generic code, so it means the same on every make.
Is it safe to drive with U0698?
Drive gently and only to a workshop. With U0698 the car can go into limp mode (reduced power) to protect itself.
Will U0698 fail an emissions test?
Yes, it can. U0698 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0698 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U0698 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.