U061F

Lost Communication With Body Control Module 'B'

U061F is a generic OBD-II network diagnostic trouble code: Lost Communication With Body Control Module 'B'. It is logged by the engine control unit when the network monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
U061F
Group
Network
System
Network
Severity
Warning (MIL on, possible limp mode)
Need U061F disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What U061F means

DTC U061F is a network communication code set when the engine or aftertreatment control module loses valid serial communication with the Exhaust Gas Temperature (EGT) Sensor Bank 1 Sensor 1 over the vehicle data bus. On systems where this sensor reports its value as a bus message, the controller expects a continuous stream of exhaust temperature data used to protect the catalyst, turbocharger, and diesel particulate filter and to manage regeneration.

The fault is a lost-communication condition rather than an out-of-range temperature reading. It is stored when the expected data frames from the EGT sensor node are missing or corrupted for a defined number of message cycles. Because the sensor is exhaust-mounted and subjected to extreme heat and vibration, common root causes are electrical: open or shorted bus wiring, loss of power or ground, connector corrosion, or a failed sensor or interface module.

When U061F is active, the ECU cannot verify exhaust gas temperature at this location. This can disable or defer DPF regeneration, force protective derating to guard the turbo and aftertreatment components, and illuminate the MIL. Diagnosis should confirm the sensor is present on the network and verify its power and ground before replacement, ruling out heat-related harness and connector damage first.

Common causes

Most-frequently reported root causes when U061F is logged.

  • 1
    Open, short, or high-resistance fault in the bus wiring to the Bank 1 Sensor 1 exhaust gas temperature sensor.
  • 2
    Failed exhaust gas temperature sensor or its bus interface module.
  • 3
    Loss of power or ground supply to the EGT sensor circuit.
  • 4
    Corroded, loose, or heat-damaged connector at the EGT sensor.
  • 5
    Chafed or melted wiring harness routed near the exhaust.
  • 6
    Blown fuse supplying the sensor or its host module.
  • 7
    Internal software fault in the module reporting EGT data on the bus.

Symptoms drivers notice

Check engine light illuminated with U061F stored.
Diesel particulate filter regeneration disabled or not completing.
Reduced engine power or protective derating to guard the turbo and catalyst.
Exhaust gas temperature reading unavailable or frozen on a scan tool.
Possible additional aftertreatment or communication DTCs stored alongside U061F.

How to diagnose U061F

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all stored DTCs from every module and note any related exhaust temperature or network codes.
  2. 2
    Check live data to confirm whether the EGT sensor is reporting on the bus or reads as missing.
  3. 3
    Inspect the sensor connector and harness near the exhaust for heat damage, chafing, corrosion, or loose terminals.
  4. 4
    Verify power and ground at the sensor connector with a multimeter and the wiring diagram.
  5. 5
    Measure bus integrity (approximately 60 ohms across CAN-H and CAN-L) to rule out wiring or termination faults.
  6. 6
    Attempt communication with the sensor or host module; if absent, confirm supply before condemning it.
  7. 7
    Replace the exhaust gas temperature sensor only after wiring, power, and ground have been confirmed good.

Related network codes

Frequently asked questions

What does U061F actually monitor?

It is a lost-communication code for the Bank 1 Sensor 1 exhaust gas temperature sensor, which the ECU uses to protect the aftertreatment system and manage regeneration.

Can I drive with U061F set?

It is not advisable, since the ECU cannot verify exhaust temperature and may block DPF regeneration or derate power to protect components.

Does U061F always mean the sensor failed?

No. Given the harsh exhaust environment, wiring and connector faults are common, so verify network integrity and supply before replacing the sensor.

Is U061F a body control module code?

No. Lost communication with the body control module is in the U014x range; U061F specifically refers to an exhaust gas temperature sensor.

Disabling U061F in software

RaceTune can permanently disable U061F — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

Got U061F in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file