U0104: Lost communication with the cruise control module
The vehicle network is not receiving messages from the cruise control module. The car drives normally, but cruise or adaptive cruise stops working.
| Code | U0104 |
|---|---|
| System | Communication network |
| Group | U01xx, Lost communication with control units |
| Type | Generic: it means the same on every make |
| Can you keep driving? | Yes, no rush |
What U0104 means
Cruise control holds the speed you set, and on many cars also the gap to the vehicle ahead (adaptive cruise). This code means its module has stopped talking to the other control units over the data network. On cars with radar, the module is usually at the front.
Most common causes
- Low or unstable battery voltage
- Blown fuse for the module
- Loose, corroded or wet connector on the module or front radar
- Damaged wiring, for example after a bump to the front bumper
- Faulty cruise control module
Symptoms
- Cruise control will not switch on
- Driver assistance unavailable message on the dashboard
- Automatic emergency braking disabled on cars that share the module
Can you drive with U0104?
Yes, no rush You can drive normally; you only lose cruise control and possibly some driver aids. Get it looked at when convenient.
Open the bonnetthe in-depth explanation
How to check it
If the car has had a knock at the front, tell the garage: the radar and its connector usually sit there. Also check whether other U codes are stored at the same time, which would point to the network or power supply.
How to read and clear U0104 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see U0104 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- U0100 Lost communication with engine control module (ECM/PCM A)
- U0101 Lost communication with transmission control module (TCM)
- U0102 Lost communication with transfer case control module
- U0103 Lost communication with the gear shift module
- U0105 The fuel injector control unit is not answering on the car network
- U0106 The glow plug control unit is not answering on the car network
- U0107 Lost communication with the throttle actuator control module
- U0108 The alternative fuel control unit is not answering on the car network
- U0121 Lost communication with the ABS control module
- U0126 Lost communication with the steering angle sensor module
- U0128 Lost communication with the park brake control module
- U0131 Lost communication with the power steering control module
What does code U0104 mean?
Cruise control holds the speed you set, and on many cars also the gap to the vehicle ahead (adaptive cruise). This code means its module has stopped talking to the other control units over the data network. On cars with radar, the module is usually at the front.
Can you drive with U0104?
You can drive normally; you only lose cruise control and possibly some driver aids. Get it looked at when convenient.
How do you clear U0104?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, U0104 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
