P0235

Turbocharger/Supercharger Boost Sensor A Circuit

Turbo/boost control Generic OBD-II High

What it means

P0235 means the engine controller has seen a problem in the circuit for turbocharger/supercharger boost pressure sensor "A". That sensor tells the ECM how much boost the engine is making. Without a trustworthy signal, the ECM often limits boost and power to protect the engine. It usually comes down to the sensor itself or its wiring, not a mechanical turbo failure.

High

Can I keep driving? Usually yes, but the engine may drop into a reduced-power limp mode to protect the turbo — drive gently and fix it soon.

Real-world scan data

Seen in

1,834

scans in the past year

Found in

0.3%

of scans

0.5%

of scans that found faults

Appears alongside · share of P0235 scans

P0110in 40.7% of scans

P0100in 34.4% of scans

P0683in 32.7% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Reduced power or limp mode
Turbo boost feels weak or inconsistent
Poor fuel economy

Common causes

Most likely first

Failed turbocharger/supercharger boost pressure sensor ALikely
Damaged wiring or poor connection at the sensorCommon
Loose or corroded electrical connectorCommon
Failed engine control module (least likely)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check the boost sensor's live reading against actual boost.
Inspect the sensor connector and wiring for corrosion, chafing, or loose pins.
Verify the sensor has a proper reference voltage and ground, then compare its output to spec.
Replace the boost sensor if its signal is out of range; repair wiring faults first. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0235?+

Short-term yes, but the engine may limit boost and power to be safe. It won't stop the car from starting — get the sensor circuit checked soon.

Can I just clear P0235?+

It will come back until the sensor or its wiring is repaired. Fix the circuit, then clear it.

Read & clear P0235 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX