U0699Lost Communication With Coolant Pump F
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Pump F is the sixth auxiliary electric coolant pump in the generic lettering, and the code flags that this pump has stopped responding on its data line. No manufacturer documents U0699 publicly; even the Mercedes bulletin that uses the E code for a low-temperature pump lists no F. Six separately addressed pumps point to elaborate thermal systems, for example vehicles with several cooling loops for engine, charge air, electronics and cabin. Such pumps typically take a PWM or LIN speed command and report their own condition, as Bosch describes for the PDE, and LIN is widely used for small motor nodes of this kind. CARB asks for an approved monitoring plan when an electric pump rather than a thermostat regulates engine temperature. P2D27 covers pump F's control performance.
- What you may notice
- Warning light depending on manufacturer
- Loop served by pump F runs too warm
- Radiator fan running more often or at full speed
- Likely causes
- LikelyData, supply or ground wire to pump F damaged
- PossiblePump F electronics or motor failed
- RareControlling module or software fault
- 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: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.