U0609Lost Communication With Manifold Absolute Pressure/Barometric Pressure Sensor
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A digital manifold pressure sensor sends pressure, often with an intake temperature value, as SENT frames; chips built for this, such as Infineon's KP276, add a status nibble with error flags and a CRC to every frame. U0609 is stored when those frames stop arriving or cannot be used. Ford's 2023 diesel summary defines it for the SENT MAP sensor: the SENT driver flags a communication fault, the data line hangs at low voltage, or the sensor flags an internal fault, checked continuously and registered after 5 s. P0105 is the separate code for a sensor whose status bit or reading is implausible. The NHTSA index lists a 2023 Audi RS 6 Avant bulletin covering U0609 with U060A. Load and boost then run on substitute values.
- What you may notice
- Check engine light
- Reduced power or limited boost
- Rough running or harder starting at altitude
- Likely causes
- LikelySENT line stuck low, open or chafed, or supply/ground missing
- PossibleSensor reports an internal fault (moisture, oil or soot ingress)
- PossibleCorroded or loose sensor connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.