U0601

Lost Communication With Tire Pressure Monitor Module

U0601 is a generic OBD-II network diagnostic trouble code: Lost Communication With Tire Pressure Monitor Module. 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
U0601
Group
Network
System
Network
Severity
Warning (MIL on, possible limp mode)
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What U0601 means

DTC U0601 is a network communication code set when the powertrain control module, or another controller responsible for diesel exhaust aftertreatment, stops receiving valid messages from the Particulate Filter Pressure Sensor A over the CAN bus. This sensor measures the pressure differential across the diesel particulate filter (DPF) and is essential for calculating soot loading and deciding when a regeneration cycle is required.

The fault is a lost-communication condition rather than an out-of-range sensor reading. It is triggered when the expected data frames from the sensor node are missing or corrupted for a defined number of message cycles. Because the sensor may be integrated into a smart pressure module or share a wiring segment with other aftertreatment sensors, root causes are usually electrical: open or shorted CAN wiring, loss of power or ground, or a failed sensor module.

When U0601 is active, the ECU cannot accurately monitor DPF back-pressure. This commonly disables or defers regeneration, can force a limp or reduced-power state to protect the aftertreatment system, and illuminates the MIL. Diagnosis should confirm network integrity and sensor power before replacing the sensor, since wiring and connector faults are frequent triggers on exhaust-mounted sensors exposed to heat and vibration.

Common causes

Most-frequently reported root causes when U0601 is logged.

  • 1
    Open, short, or high-resistance fault in the CAN bus wiring to the Particulate Filter Pressure Sensor A.
  • 2
    Failed or internally shorted particulate filter pressure sensor or its interface module.
  • 3
    Loss of power or ground supply to the pressure sensor circuit.
  • 4
    Corroded, loose, or damaged connector at the sensor exposed to exhaust heat and vibration.
  • 5
    Chafed or melted wiring harness near the exhaust or DPF assembly.
  • 6
    Blown fuse feeding the sensor or its host aftertreatment module.
  • 7
    Water or contamination intrusion into the sensor connector.
  • 8
    Software or internal fault in the module reporting the sensor data on the bus.

Symptoms drivers notice

Check engine light illuminated with U0601 stored.
Diesel particulate filter regeneration disabled or not completing.
Reduced engine power or limp mode to protect the aftertreatment system.
DPF soot load or differential pressure reading unavailable or frozen on a scan tool.
Possible additional aftertreatment or communication DTCs stored alongside U0601.

How to diagnose U0601

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all stored DTCs from every module and note whether other aftertreatment or network codes are present.
  2. 2
    Review live data to confirm whether the DPF pressure sensor is reporting on the bus or reads as missing.
  3. 3
    Inspect the sensor connector and harness near the DPF for heat damage, chafing, corrosion, or loose terminals.
  4. 4
    Verify power and ground at the sensor connector using the wiring diagram and a multimeter.
  5. 5
    Measure CAN 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 the sensor.
  7. 7
    Replace the particulate filter pressure sensor only after wiring, power, and ground have been verified good.

Related network codes

Frequently asked questions

What does U0601 actually monitor?

It is a lost-communication code for the Particulate Filter Pressure Sensor A, which measures the pressure difference across the diesel particulate filter to manage regeneration.

Can I keep driving with U0601 set?

It is not recommended; the ECU cannot monitor DPF back-pressure, so regeneration may be blocked and the vehicle may enter limp mode, risking DPF clogging.

Does U0601 always mean the sensor is faulty?

No. Wiring, connector, power, and ground faults are common, so network integrity and supply should be verified before replacing the sensor.

Is U0601 the same as a tire pressure sensor code?

No. Tire pressure monitor communication loss is code U0127; U0601 refers specifically to the diesel particulate filter pressure sensor.

Disabling U0601 in software

RaceTune can permanently disable U0601 — 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.

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