P025E
Turbocharger/Supercharger Boost Sensor A Intermittent/Erratic
Turbo / boost & air metering
Generic OBD-II
High
What it means
P025E means the 'A' turbocharger/supercharger boost pressure sensor is sending an intermittent or erratic signal — it drops out or jumps around rather than tracking boost smoothly. Because the module uses this reading to manage boost, an unstable signal typically causes on-and-off power loss or a reduced-boost mode. Intermittent faults most often trace back to wiring and connectors.
High
Can I keep driving? The car usually still runs but boost may cut in and out, dropping it into reduced-power mode; drivable in the short term, but have the circuit checked before hard driving.
Common symptoms
What you'll notice
- Check-engine light on
- Intermittent loss of power or reduced-boost limp mode
- Hesitation or surging under acceleration
- Erratic boost gauge or logged boost readings
Common causes
Most likely first
- Loose, corroded, or intermittent connector at the boost sensor 'A'Likely
- Chafed or intermittently shorting wiring in the boost-sensor circuitCommon
- Faulty boost pressure sensor 'A'Common
- Boost or vacuum leak causing unstable pressure signalsLess often
- Wastegate or turbo fault producing erratic actual boostLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data, then wiggle-test the boost-sensor connector and wiring while monitoring live data for signal dropouts.
- Inspect the connector and terminals for corrosion, spread pins, or a loose fit.
- Check for intake/boost leaks that could make the reading jump around.
- Compare the sensor's live signal to a known-good reference and replace it if it reads erratically.
- Confirm wastegate/turbo operation, then clear the code and road-test.
FAQ
Quick answers
Is it safe to drive with P025E?+
Briefly — but expect intermittent power loss when the module distrusts the boost signal. Erratic boost is best diagnosed before extended driving.
Can I just clear P025E?+
Being intermittent, it may stay away for a while, but it returns whenever the signal drops out again. The connection or sensor still needs fixing.
Related codes
Often seen with P025E
Read & clear P025E 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