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Home / DTC / U355D — Expander Inlet Pressure Sensor 1 Circuit

U355D — Expander Inlet Pressure Sensor 1 Circuit

Detailed page for trouble code U355D.

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Code

U355D

Generic U — Network/User

Expander Inlet Pressure Sensor 1 Circuit

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 30 RU: 20
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Page language: EN

Causes

  • Open or shorted wiring between sensor and control module
  • Corroded, loose or damaged sensor connector/pins
  • Failed Expander Inlet Pressure Sensor 1
  • Loss of reference voltage or ground to the sensor
  • Intermittent contact from chafed harness or damaged insulation
  • CAN/LIN network or module communication error

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning light illuminated
  • Logged U355D or related network/circuit codes
  • Incorrect or no expander/boost pressure reading on scan tool or dash
  • Reduced power, limp mode, or poor turbo/expander control (vehicle dependent)
  • Intermittent engine surging, stalling or hesitation under load
  • No-start condition if sensor required for control logic (rare)

What to check

  • Retrieve freeze frame and full code list with a scan tool. Note related codes and live data.
  • Inspect sensor connector and wiring for corrosion, bent pins, water intrusion, damage or poor locking.
  • Check for proper reference voltage (typically 5 V) and ground at the sensor connector with key on.
  • Measure sensor output signal voltage with key on/engine running and observe changes with load.
  • Wiggle test harness/connectors while monitoring live data to reproduce the fault.
  • Perform continuity and resistance checks from sensor pins to the control module connector.

Signal parameters

  • Sensor supply/reference: typically 5 V reference (verify exact value from OEM data)
  • Sensor ground: close to 0 V (good chassis or signal ground)
  • Sensor output: commonly an analog voltage roughly in the 0.5–4.5 V range proportional to pressure (range varies by system)
  • Expected update rate: analog/update typically continuous; networked sensors may update at 10–50 Hz (verify with OEM data)
  • Typical pressure ranges vary by application — consult vehicle-specific specs for exact kPa/bar ranges

Diagnostic algorithm

  1. Connect a capable scan tool, record U355D freeze frame and any other stored codes. Note live sensor values and behavior.
  2. Inspect the sensor and harness for visible damage, corrosion, moisture or loose connectors. Repair as needed.
  3. With connector connected, backprobe and verify reference voltage and ground at the sensor connector with key on. If reference or ground is missing, trace back to source and repair.
  4. Measure sensor signal voltage at rest and while inducing pressure change (if safe) or during engine operation. Compare to expected ranges from OEM data.
  5. Perform wiggle and flex tests on the harness and connectors while monitoring the signal and DTC status to identify intermittent faults.
  6. Check continuity and for shorts between signal, reference and ground circuits from sensor connector to the control module. Repair any open or shorted circuits.
  7. If wiring and power/ground are good but signal remains invalid, substitute a known-good sensor (if available) or bench-test the sensor per OEM procedure.
  8. If the sensor and wiring check good but the code persists, inspect the vehicle network (CAN/LIN) for errors and verify the receiving module is functioning. Reflash or replace module only after confirming wiring/sensor condition.
  9. After repairs, clear codes, perform a functional test and carry out a road test while monitoring live data to confirm the fault is resolved.
  10. If intermittent and not reproducible, advise extended road test or instrument harness with scope/data logger to catch event.

Likely causes

  • Failed sensor or contaminated sensor internals
  • Connector corrosion, bent pins or poor mating
  • Open/cut wiring or broken conductor
  • Short to battery voltage or ground on the signal or reference circuit
  • Loss of 5 V reference or vehicle ground at sensor
  • Intermittent fault from harness rubbing/strain at a harness clamp

Fault status

⚠️ Status
U355D — Expander Inlet Pressure Sensor 1 Circuit: signal missing, out-of-range, intermittent or communication fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0191 P0193 P0107 P0108 U0100 U0121
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