OBD-II code · Network
U019A Lost Communication With Tachograph Module
ECU lost communication with the tachograph module (commercial vehicle driving-time recorder, EU regulation).
Is it safe to drive with U019A?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyModule unpowered
- 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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Tachograph Module, Can Bus
Related codes
- U0197Lost Communication with Hands-Free Phone Control Module
- U0198Lost Communication with Telematic Control Module
- U0199Lost Communication with Door Control Module
- U019BLost Communication With Battery Charger Control Module A
- U019CLost Communication With Glow Plug Control Module 2
- U019DLost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.