P047E
Exhaust Pressure Sensor B Circuit Intermittent/Erratic
Exhaust / emissions
Generic OBD-II
Medium
What it means
P047E means the "B" exhaust pressure (back-pressure) sensor is sending an intermittent or erratic signal to the ECM. This sensor supports EGR control and, on diesels, DPF regeneration. It's usually a failing sensor, a loose connector, or wiring that breaks contact intermittently. The engine still starts and runs normally, though diesels may occasionally enter reduced-power mode.
Medium
Can I keep driving? Yes — the car starts and drives. On diesels it may occasionally drop into reduced-power mode until repaired.
Common symptoms
What you'll notice
- Check-engine light on
- Occasional reduced power or limp mode (common on diesels)
- Slightly reduced fuel economy
- Possible erratic running under load
Common causes
Most likely first
- Faulty exhaust pressure (back-pressure) sensor BLikely
- Intermittent open or short in the sensor harnessCommon
- Loose or corroded connector at the sensorCommon
- Blocked or cracked pressure sensing tube/portLess often
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and monitor the sensor's live signal while wiggling the harness to reproduce the fault.
- Inspect the connector and wiring for corrosion, loose pins, or chafing.
- Check the sensing tube/port for soot blockage or cracks.
- Test the sensor against spec and replace it if the signal is erratic.
- Repair the wiring or replace the sensor, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P047E?+
Short-term yes — it starts and runs. On diesels the code may intermittently trigger reduced-power mode, so get it repaired soon.
Can I just clear P047E?+
An intermittent fault like this usually comes back. You'll likely need to wiggle-test the wiring to pin down the cause before clearing sticks.
Related codes
Often seen with P047E
Read & clear P047E yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX