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Home / DTC / U0667 — Lost Communication With Engine Oil Temperature Sensor A

U0667 — Lost Communication With Engine Oil Temperature Sensor A

Detailed page for trouble code U0667.

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Code

U0667

Generic U — Network/User

Lost Communication With Engine Oil Temperature Sensor A

Brand: Generic
Type: U — Network/User
Views: UK: 19 EN: 25 RU: 18
AI status
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ready
Completed 100%
Page language: EN

Causes

  • Faulty engine oil temperature sensor A
  • Open, short or high-resistance wiring between sensor and control module
  • Corroded, loose or damaged sensor connector(s)
  • Lost or corrupted CAN/serial-network message (bus fault, termination, or module bus-off)
  • Power or ground fault to the sensor
  • Faulty receiving control module (PCM/ECM) or gateway module software/firmware issue

Symptoms

  • Malfunction indicator lamp (MIL) or warning message illuminated
  • Oil temperature gauge or display missing, blank, or showing implausible values
  • Related engine management strategies may be disabled or operate in fallback mode
  • Possible reduced functionality of systems that use oil temperature (cold/hot protections)
  • Diagnostic trouble code U0667 stored (may be coupled with other U-codes)

What to check

  • Read stored and pending DTCs with a scan tool; record freeze-frame and diagnostic data
  • Use a scan tool to monitor live oil temperature values and message presence/age
  • Check for other U-codes indicating bus or module communication problems
  • Visually inspect the sensor connector and wiring for corrosion, damage, pins pushed out, or moisture
  • Check sensor supply voltage and ground at the connector with key on (refer to vehicle wiring)
  • Check continuity/resistance of wiring between sensor connector and control module; check for shorts to battery or ground

Signal parameters

  • Expected oil temperature value range: roughly -40°C to +150°C (actual vehicle-specific range may vary)
  • Analog sensor: typical output 0.1–5.0 V range depending on temp (vehicle-specific)
  • Resistance-type (thermistor): resistance changes with temperature (vehicle-specific curves)
  • Networked sensor: periodic CAN/lin/diagnostic message containing oil temp parameter at the module-specific message ID
  • Message update rate: typically 1–10 Hz for engine oil temp (varies by manufacturer)
  • CAN bus idle differential voltage: approximately half battery (two-wire differential); termination ≈ 60 Ω across pair (vehicle dependent)

Diagnostic algorithm

  1. Verify and document U0667 and any related codes using a scan tool. Note whether code is current or history/intermittent.
  2. Attempt to view live oil temperature data and any related message IDs. If no value or stale data, confirm communication failure.
  3. Visually inspect the sensor and connector. Repair any corrosion, bent pins, or damaged locking tabs.
  4. With key ON (engine off), verify sensor supply voltage and ground at the connector against vehicle specifications. Repair open/short/power faults.
  5. If sensor is analog/resistive: disconnect sensor and measure sensor resistance or bench-test at ambient temperature to compare with expected curve. If sensor is out of spec, replace sensor.
  6. If sensor communicates over a network: use a bus scanner or scope to confirm the presence and quality of the message or examine the physical bus for noise, low amplitude, or missing termination.
  7. Check wiring continuity between the sensor connector and the receiving module. Repair any opens or shorts. Pay attention to connectors at harness splices or junction boxes.
  8. Inspect fuses, relays, and module grounds that supply the sensor or network as applicable.
  9. If wiring and sensor check good, check for software updates or module reprogramming notes; perform module reflash or configuration if directed by manufacturer.
  10. After repairs, clear codes, perform a functional test and road/heat cycle to ensure code does not return. If code returns and wiring/sensor verified, consider replacing the receiving module as a last step and consult manufacturer technical service bulletins.

Likely causes

  • Damaged wiring or poor connector at the sensor
  • Failed oil temperature sensor element
  • CAN/communication bus failure or missing message from sensor module
  • Missing sensor power/ground or blown fuse
  • Module software/configuration error

Fault status

⚠️ Status
Lost communication with Engine Oil Temperature Sensor A — control module is not receiving valid data or messages from the sensor circuit or network. May be intermittent or permanent until wiring, sensor, network, or module fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0155 U0073 U0416
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