OBD-II code · Network
U043F Invalid Data Received From Vacuum Sensor B
A receiving module detected implausible data from vacuum sensor B (typically brake booster vacuum). Pressure values fail plausibility checks against engine load and are rejected.
Is it safe to drive with U043F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
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
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Vacuum Sensor B
Related codes
- U043EInvalid Data Received From Vacuum Sensor A
- U043CInvalid Data Received From Front Distance Range Sensor — Right
- U043DInvalid Data Received From Accelerator Pedal Module
- U0440Invalid Data Received from Drive Motor Control Module
- U0441Invalid Data Received From Emissions Critical Control Information
- U0442Invalid Data Received From ECM/PCM B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.