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Home / DTC / P047D — Exhaust Pressure Sensor B Circuit High

P047D — Exhaust Pressure Sensor B Circuit High

Detailed page for trouble code P047D.

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P047D

Generic P — Powertrain

Exhaust Pressure Sensor B Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 21 RU: 13
AI status
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Page language: EN

Causes

  • Faulty exhaust pressure sensor (sensor B)
  • Short to battery/positive (power) on the sensor signal or reference circuit
  • Open/poor ground or damaged wiring harness
  • Corroded, loose, or contaminated connector pins
  • Intermittent connector contact (vibration-related)
  • PCM or engine control module internal fault (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine performance or limp mode on some vehicles
  • DPF regeneration failures or disabled regeneration (diesel vehicles)
  • Poor fuel economy
  • Stored related exhaust or emissions codes
  • Possible unusual exhaust restrictions if a true pressure issue is present

What to check

  • Read freeze frame and related codes with a scan tool; note live data for exhaust pressure B
  • Compare sensor B signal voltage/pressure value to sensor A (if equipped) and to expected range
  • Visually inspect sensor, tubing (if remote mounted), and harness for damage, chafing, corrosion, or oil/soot contamination
  • Backprobe connector and measure signal voltage, reference (typically 5 V) and ground continuity at key ON and engine running
  • Wiggle harness and connector while monitoring live data to check for intermittent changes
  • Inspect PCM connector for damage or corrosion and check for TSBs/recalls

Signal parameters

  • Typical sensor signal voltage: approximately 0.5–4.5 V (varies by manufacturer)
  • Reference voltage to sensor: ~5.0 V (check vehicle spec)
  • Expected idle/normal pressure voltage: vehicle-specific — compare to known-good or sensor A if available
  • Open-circuit or short-to-power conditions often cause signal voltage to read near the reference or battery voltage
  • Ground continuity: low resistance to chassis/PCM ground (close to 0 Ω)

Diagnostic algorithm

  1. Retrieve stored/freeze-frame data and related codes. Note whether the code is current or historic and whether other exhaust/DPF codes are present.
  2. Inspect sensor B, its vacuum/pressure tubing and connector for physical damage, soot/oil contamination, loose pins, or corrosion. Repair any obvious damage.
  3. With ignition ON (engine off), backprobe the sensor connector: measure signal voltage, reference (5 V), and ground. Compare to factory specs. If reference is missing or low, suspect PCM or wiring.
  4. With connector connected, start engine and monitor live sensor voltage with a scan tool. Wiggle harness/connectors to check for intermittent faults.
  5. If signal is high, disconnect the sensor (some vehicles will pull the line to a default). Observe the change in signal: if it stays high with sensor disconnected, suspect wiring or PCM (short to power). If it drops/changes, suspect the sensor.
  6. Check for short to power: with ignition off, measure resistance between sensor signal pin and vehicle battery positive (B+). Low resistance indicates short to power.
  7. Check ground integrity: measure resistance between sensor ground and chassis/PCM ground. High resistance indicates a bad ground.
  8. If wiring looks good but measurements are out of spec, replace the sensor and retest. If problem persists after sensor replacement, trace/repair wiring or replace/repair PCM as a last resort.
  9. After repairs, clear codes and perform a drive cycle or forced DPF/regeneration (if applicable) to confirm the code does not return.

Likely causes

  • Sensor wiring shorted to battery voltage or to a circuit supplying power
  • Failed sensor producing an abnormally high output voltage
  • Corroded/contaminated connector causing high resistance or false readings
  • Broken insulation or chafed harness contacting a power source
  • PCM providing incorrect reference voltage or faulty input circuit

Fault status

⚠️ Status
Exhaust Pressure Sensor B Circuit High — sensor signal voltage higher than expected or above allowed range. Check sensor, wiring, connector, and PCM reference.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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