P0035

Turbocharger/Supercharger Bypass Valve A Control Circuit High

Q: Is it safe to drive with P0035?

Short trips are usually fine, but you'll have reduced boost and may drop into limp mode. Repair soon to restore full power.

Q: Can I just clear P0035?

It will return while the circuit is faulted. Trace the wiring or replace the bypass valve before clearing.

Turbo / boost control Generic OBD-II High

What it means

P0035 means the ECM sees higher-than-expected voltage on the control circuit for the turbo/supercharger bypass (diverter) valve — the valve that vents boost pressure when you lift off the throttle. A fault here disrupts boost control, so you may notice reduced power, lag, or limp mode. It's an electrical issue in the circuit, usually the wiring or the valve, and it does not cause a no-start.

High

Can I keep driving? Usually yes, but with reduced boost and power; drive gently and repair soon to avoid limp mode and protect the turbo system.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

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 boost and power
Hesitation or lag under acceleration
Possible limp mode

Common causes

Most likely first

Open or short (high voltage) in the bypass valve control circuit (most common)Likely
Corroded or loose connector at the valveCommon
Faulty turbo/supercharger bypass (diverter) valveCommon
Failed ECM (rare)Less often

How to diagnose & fix

Work through it in order

Inspect the bypass valve connector and wiring for opens, shorts, or corrosion.
Check the control-circuit voltage and the valve's resistance against spec.
Verify power and ground to the circuit.
Replace the bypass valve if it fails testing.
If the circuit and valve are good, suspect the ECM. Clear and retest.

FAQ

Quick answers

Is it safe to drive with P0035?+

Short trips are usually fine, but you'll have reduced boost and may drop into limp mode. Repair soon to restore full power.

Can I just clear P0035?+

It will return while the circuit is faulted. Trace the wiring or replace the bypass valve before clearing.

Read & clear P0035 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