What Does P047E Mean?
The exhaust pressure sensor 'B' circuit signal is behaving intermittently or erratically, with the ECM detecting sudden signal drops, spikes, or noise that do not correlate with actual exhaust conditions. The driver may notice occasional surging, brief power fluctuations, or a check engine light that appears and disappears.
Common Causes
35%
Loose or corroded connector at the exhaust pressure sensor 'B' causing intermittent contact
28%
Chafed or heat-damaged wiring near exhaust components causing intermittent shorts or opens
22%
Exhaust pressure sensor 'B' internal failure with intermittent signal output
15%
Poor ECM connector pin tension or backed-out pin on the sensor circuit
Diagnostic Steps
1
Monitor exhaust pressure sensor 'B' signal in live data at a steady idle — the reading should be stable with minimal fluctuation (±2 kPa). Erratic jumps of 10+ kPa confirm the intermittent fault.
2
Wiggle-test the sensor connector and harness at multiple points while monitoring the signal. Note if spikes or dropouts coincide with harness movement.
3
Inspect the connector for spread, corroded, or backed-out terminals. Use a terminal pick to reseat pins and verify retention force. Apply dielectric grease to protect from moisture.
4
Trace the harness from sensor to ECM, looking for areas where insulation is melted, abraded, or brittle from exhaust heat exposure. Repair any damaged sections with heat-resistant wiring.
5
If the harness is clean, apply a steady pressure to the sensor with a hand pump and monitor the output voltage for instability. A signal that jumps while pressure is stable confirms a bad sensor.
Estimated Repair Cost
$80 - $500
Parts + labor, varies by vehicle and location
The exhaust pressure sensor 'B' circuit signal is behaving intermittently or erratically, with the ECM detecting sudden signal drops, spikes, or noise that do not correlate with actual exhaust conditions. The driver may notice occasional surging, brief power fluctuations, or a check engine light tha...
The most common cause of P047E (Exhaust Pressure Sensor "B" Circuit Intermittent/Erratic) is: Loose or corroded connector at the exhaust pressure sensor 'B' causing intermittent contact
Typical repair costs for P047E range from $80 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive in most conditions. Intermittent data may cause the ECM to occasionally adjust engine parameters unpredictably. If power fluctuations are severe, limit driving and repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P047E to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Exhaust / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
