Code
U0692
Generic
U — Network/User
Lost Communication With Exhaust Pressure Sensor B
Views:
UK: 11
EN: 22
RU: 15
AI status
Completed
Completed
100%
Causes
- Faulty or intermittent exhaust pressure sensor B
- Open/short or corrosion in sensor wiring or connectors
- Poor sensor power or ground (fused supply, chassis ground)
- Loss of or faults on the vehicle data bus (CAN/LIN) between sensor module and ECU
- Faulty sensor module or gateway/controller
- Software/firmware mismatch or module initialization failure
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced or altered emission control strategies (possible regen or DPF warnings)
- Unavailable or erratic exhaust pressure B live data on the scan tool
- Possible limp-home mode or derated performance depending on system
- Stored related diagnostic trouble codes and freeze frame data
What to check
- Read all stored/active U- and P-codes and capture freeze-frame and live data
- Attempt to view Exhaust Pressure Sensor B live data with a scan tool; note if data is missing or static
- Visually inspect sensor connector(s) and wiring for corrosion, heat damage, or disconnection
- Check relevant fuses and measure key supply voltages to the sensor/module with the ignition ON
- Measure sensor ground for low resistance to chassis ground
- Check CAN/LIN bus physical layer: measure differential voltage (CAN approx. 2.5 V idle) and look for bus errors
Signal parameters
- Exhaust pressure sensor analog output typically 0.5–4.5 V (model-dependent) proportional to pressure
- Sensor reference supply commonly 5 V (check manufacturer-specific value) and a reliable ground < 0.5 Ω to chassis
- CAN bus idle recessive voltage ~2.5 V on CAN_H and CAN_L average; differential ~0 V idle with CAN_H ~2.5 V, CAN_L ~2.5 V
- Expected message rate: periodic CAN/LIN messages from sensor/module (verify with OEM data or scan tool)
- No valid message or continuously repeating error frames indicates communication loss
Diagnostic algorithm
- Verify the code and note freeze frame data. Re-scan to confirm U0692 is current and not historic.
- Use an OEM-level scan tool to attempt to poll the sensor/module. Confirm whether the module responds to diagnostics.
- Visually inspect and, if possible, disconnect and re-seat the Exhaust Pressure Sensor B connector. Check for corrosion, bent pins, or contamination.
- With ignition ON (engine OFF), back-probe the sensor connector: verify reference voltage (≈5 V), sensor ground, and sensor output signal presence. Compare to expected ranges.
- If sensor output is missing or stuck, check continuity from the sensor connector to the controlling module/ECU for opens/shorts. Repair any damaged wiring.
- Check the CAN/LIN bus at the sensor/module and at the ECU: measure CAN_H/CAN_L voltages with ignition ON, and use a scope or scan tool to check for valid CAN traffic and error frames.
- If bus voltages or traffic are abnormal, isolate by disconnecting modules one at a time (where safe) or by shorting/removing suspected modules to identify the fault source. Inspect related fuses and power circuits.
- If wiring and bus are good but the sensor/module does not communicate, substitute a known-good sensor or module (if available) to verify behavior before replacement.
- After any repair, clear codes, perform a key cycle and a short test drive or system exercise. Re-scan to confirm the code does not return and that live data appears as expected.
- If intermittent, perform extended road test and consider harness protection or routing changes to prevent future damage. If communication faults persist, consult OEM wiring diagrams and manufacturer service bulletins.
Likely causes
- Corroded/damaged connector at the exhaust pressure sensor
- Broken wire or pinched harness between sensor and controller/module
- Sensor internal failure (no output or intermittent output)
- CAN bus fault (open, short to ground/power or high bus error) preventing messages
- Module fault at the device that publishes exhaust pressure B data
Fault status
Status
Lost Communication With Exhaust Pressure Sensor B — the vehicle control module is not receiving expected data/messages from Exhaust Pressure Sensor B or its supplying module. Check sensor, wiring, power/ground and vehicle data bus.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
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