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Home / DTC / U068D — Lost Communication With EGR Temperature Sensor A

U068D — Lost Communication With EGR Temperature Sensor A

Detailed page for trouble code U068D.

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U068D

Generic U — Network/User

Lost Communication With EGR Temperature Sensor A

Brand: Generic
Type: U — Network/User
Views: UK: 13 EN: 19 RU: 11
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Page language: EN

Causes

  • Open, shorted or corroded wiring or connector to the EGR temperature sensor
  • Failed EGR temperature sensor
  • Faulty EGR temperature sensor ground or supply circuit
  • Faulty engine control module (ECM) or another control module that relays the sensor data
  • Damaged or impaired vehicle communication bus (CAN/LIN) — open, short to Vb/GND, high resistance, missing termination
  • Intermittent connection (bent pin, water intrusion) or connector not fully seated

Symptoms

  • MIL (Check Engine Light) illuminated with U068D stored
  • Diminished or disabled EGR operation, which may cause increased NOx or degraded emissions performance
  • Possible reduced engine performance or limp-home strategy
  • Other communication-related DTCs present (bus errors, other module comm faults)
  • No valid EGR temperature PID/live data in scan tool for sensor A

What to check

  • Read all stored DTCs and freeze frame data; note any other communication codes or related EGR codes
  • Use a scan tool to monitor EGR temperature PID and communication bus status/messages
  • Visually inspect sensor connector and wiring for corrosion, damage, pin push-out, or water intrusion
  • Verify sensor supply voltage and ground at the connector with key on/engine off
  • Check continuity/resistance of CAN/LIN lines between sensor/module and ECM; verify correct termination resistance (~60 ohms across CANH-CANL for a two-terminator CAN)
  • Backprobe connector while monitoring data frames with a capable scan tool or scope

Signal parameters

  • EGR temperature sensor analog range: typical -40°C to ~150°C (sensor dependent) reported as PID value when communicating
  • CAN bus idle common-mode ~2.5 V; CANH typically ~2.5–3.5 V, CANL ~1.5–2.5 V (differential signal when active)
  • Expected presence of regular CAN/LIN frames for EGR sensor PID at engine run or requested intervals
  • Termination resistance for CAN bus: approximately 60 ohms measured between CANH and CANL (two 120 Ω terminators in parallel)
  • LIN bus idle typically pulled to battery voltage via pull-up; active low frames — check for correct voltage levels and frame timing (baud rate depends on vehicle)

Diagnostic algorithm

  1. Confirm code and collect freeze frame and related DTCs. Note whether code is current or intermittent.
  2. With a scan tool, verify whether EGR temperature PID A is present and whether any other modules report bus errors or bus-off states.
  3. Visually inspect EGR temp sensor connector and wiring for damage, corrosion, pins pushed out, or water ingress. Repair or clean as needed.
  4. Verify reference power and ground at the sensor connector with key on. If power/ground missing, trace and repair wiring, fuses, or relays.
  5. Check continuity of CAN/LIN wires from the sensor to the module(s). Repair any opens/shorts. Verify correct termination resistance across CANH/CANL.
  6. Use an oscilloscope or high-speed data logger to observe CAN/LIN signals at the sensor connector while the system is operating. Look for missing frames, excessive noise, incorrect voltage levels, or bus collisions.
  7. If physical wiring and bus signals are good, substitute a known-good EGR temperature sensor (if available) and repeat communication check.
  8. If sensor substitution does not restore communication, inspect/replace affected module connector or consider ECM/module testing. Reflash or update module software if manufacturer bulletin indicates.
  9. After repairs, clear codes, perform a functional test of EGR operation and road test to confirm the fault does not return.
  10. If intermittent, stress-test wiring by flexing harness, applying dielectric grease, and verifying long-term reliability before concluding repair.

Likely causes

  • Corroded/loose connector at the EGR temperature sensor
  • Broken or chafed CAN/LIN wiring harness near engine or EGR valve
  • Failed EGR temperature sensor that does not respond to bus frames
  • Missing or damaged CAN termination resistor(s) causing bus errors
  • Poor ground at ECM or sensor ground circuit
  • Module in bus-off state due to repeated errors

Fault status

⚠️ Status
Lost Communication With EGR Temperature Sensor A — expected data from EGR temperature sensor A not received on vehicle communication bus (CAN/LIN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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U0100 U0073 U0401 P0401 P0402 U1115
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