OBD-II code · Network
U0609 Lost Communication With Manifold Absolute Pressure/Barometric Pressure Sensor
The vehicle bus reports loss of communication with smart MAP/BARO sensor. Without these inputs, ECM load and altitude correction switch to fallback values.
Is it safe to drive with U0609?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Map Baro Sensor, Vehicle Bus Wiring
Related codes
- U0606Lost Communication With Throttle/Pedal Position Sensor/Switch A
- U0607Lost Communication With Throttle/Pedal Position Sensor/Switch B
- U0608Lost Communication With Throttle/Pedal Position Sensor/Switch C
- U060ALost Communication With Manifold Absolute Pressure Sensor B
- U060BLost Communication With Turbocharger/Supercharger Boost Sensor A
- U060CLost Communication With Turbocharger/Supercharger Boost Sensor B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.