OBD-II code · Network
U013D Lost Communication With Vacuum Sensor A
ECU lost CAN communication with vacuum sensor A (often a smart sensor with bus interface). A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Is it safe to drive with U013D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor unpowered or bus connection broken
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- Often, with basic tools
- 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
- Vacuum Sensor A, Can Bus
Related codes
- U013ELost Communication With Vacuum Sensor B
- U0138Lost Communication with All Terrain Control Module
- U0139Lost Communication with Active Roll Control Module
- U013CLost Communication With Accelerator Pedal Module
- U013FLost Communication With Pedestrian Alert Control Module
- U0140Lost Communication with Body Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.