U019A code meaning
Lost Communication With Tachograph Module
What U019A means
U019A is stored when the tachograph stops sending on the vehicle bus. Tachographs log speed, distance and driving time in trucks and buses; in the EU every newly registered vehicle of that class has needed a digital unit since May 2006. Many engine and body controllers take road speed from the tachograph frame, so the fault reaches beyond the logbook. Deutz lists U019A-00 as a communication fault with the tachograph in the fault table of its EMR L1 main engine controller and pairs it with SPN 1620 and FMI 2. No passenger-car maker documents the code publicly. Possible effects are a missing speed reading, inactive cruise control or speed limiter and a tachograph warning; whether a MIL lights is up to the engine maker. U049B is the invalid-data counterpart.
U019A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U019A
- Tachograph warning or speed display missing
- Cruise control or road speed limiter unavailable
- Code stored in the engine controller
Common causes of U019A
- Most likelyTachograph without power, ground or ignition signal
- PossibleCAN wiring or connector behind the tachograph damaged
- PossibleTachograph replaced or recalibrated without matching the bus configuration
- Less likelyTachograph unit faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Tachograph moduleCAN bus
What each part of U019A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9A | The exact fault in that area. |
What to do next
- Note U019A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U019A
What does U019A mean?
U019A means "Lost Communication With Tachograph Module". U019A is stored when the tachograph stops sending on the vehicle bus. It is a generic code, so it means the same on every make.
Is it safe to drive with U019A?
U019A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U019A fail an emissions test?
U019A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U019A to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U019A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.