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Home / DTC / U067A — Lost Communication With Transmission Fluid Pressure Sensor/Switch B

U067A — Lost Communication With Transmission Fluid Pressure Sensor/Switch B

Detailed page for trouble code U067A.

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U067A

Generic U — Network/User

Lost Communication With Transmission Fluid Pressure Sensor/Switch B

Brand: Generic
Type: U — Network/User
Views: UK: 15 EN: 22 RU: 14
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Page language: EN

Causes

  • Faulty transmission fluid pressure sensor/switch B
  • Damaged or corroded sensor connector or wiring harness
  • Open, short to ground, or short to battery on sensor signal/reference/ground
  • Faulty transmission control module (TCM) or powertrain control module (PCM)
  • Intermittent connection (pin pushed out, bent pins, water intrusion)
  • CAN or LIN communication bus fault (bad termination, short, open, transceiver failure)

Symptoms

  • Malfunction Indicator Lamp (MIL) or Transmission warning lamp illuminated
  • Transmission may enter limp/backup mode or have abnormal shift behavior
  • Delayed or harsh shifts, inability to shift into certain gears
  • Diagnostic trouble codes related to transmission sensors or communications present
  • No/erratic fluid pressure data visible on a scan tool

What to check

  • Retrieve all stored and pending codes and freeze frame data with a scan tool
  • Verify battery voltage and ground integrity (while key on and engine running where applicable)
  • Check for presence of the sensor on the network: verify TCM/PCM sees the module and other modules are communicating
  • Inspect the sensor connector and wiring for corrosion, water intrusion, bent pins, or physical damage
  • Backprobe the sensor connector and measure reference voltage, signal, and ground
  • Check CAN/LIN bus voltages and termination resistances (look for opens or shorts)

Signal parameters

  • Sensor types vary by application: may be a pressure switch (open/closed) or pressure sensor (analog 0–5 V).
  • Typical reference supply: 5 V nominal (acceptable ~4.75–5.25 V) where sensor uses a reference.
  • Analog signal typical range: ~0.1–4.9 V depending on pressure. Closed switch = near 0 V or battery depending on design; open = high impedance.
  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V).
  • If LIN is used, the bus idles near battery voltage and is driven low for frames; check manufacturer specs.

Diagnostic algorithm

  1. Confirm the code and record freeze frame and live data. Note whether other communication U-codes are present.
  2. Verify battery and ground values. Correct any low-voltage or poor-ground conditions before further testing.
  3. Inspect the transmission fluid pressure sensor/switch B connector and wiring for damage or corrosion. Repair any obvious issues.
  4. With connector connected, backprobe reference, signal and ground pins. Compare measured values to expected ranges from signal_params.
  5. If the sensor uses CAN or LIN, check bus voltages at the sensor connector and at the TCM/PCM. Verify correct termination and absence of shorts.
  6. Perform a wiggle test on harness while monitoring live data for intermittent loss. Repair any chafing or broken conductors.
  7. If wiring and bus appear good, substitute a known-good sensor (if available) or measure sensor resistance/continuity per manufacturer spec.
  8. If replacement sensor does not restore communication, test or swap the TCM/PCM or inspect CAN transceiver circuits and module grounds/power.
  9. After repairs, clear codes, perform a controlled road test and re-scan to ensure the code does not return and that transmission behavior is normal.
  10. If intermittent or complex network faults persist, use an oscilloscope to capture bus traffic and voltage transients for advanced analysis.

Likely causes

  • Corroded/loose connector at the sensor or module
  • Broken or chafed harness where it flexes near the transmission
  • Failed sensor (internal electronics) or sensor power/reference failure
  • Faulty CAN/LIN transceiver in TCM/PCM or harness short on communication lines
  • Intermittent fault caused by moisture or wiring abrasion

Fault status

⚠️ Status
Lost Communication With Transmission Fluid Pressure Sensor/Switch B — control module is not receiving expected data or status from sensor/switch B; communication may be intermittent or absent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

U0100 U0115 U0121 U0126 P0715
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