P0048

Turbocharger/Supercharger Boost Control A Circuit High

Q: Is it safe to drive with P0048?

Short trips are usually okay, but boost control is compromised — overboost can damage the engine and underboost or limp mode saps power, so fix it promptly.

Q: Can I just clear P0048?

You can, but if the circuit fault is still present it returns quickly and boost stays uncontrolled until repaired.

Forced induction / boost control Generic OBD-II High

What it means

P0048 means the engine computer sees an abnormally high voltage on the control circuit for the turbo or supercharger boost control solenoid. That points to an electrical fault in the solenoid or its wiring rather than the turbo itself. With boost no longer controlled properly, the engine may drop into reduced-power limp mode or, less often, overboost — which is why it should be addressed before hard driving.

High

Can I keep driving? Usually still drivable, but boost control is unreliable — you may get reduced power or limp mode, and occasionally overboost, so have it checked before hard driving.

Real-world scan data

Seen in

146

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 power or limp-home mode
Boost pressure too high (overboost) or too low
Turbo lag or hesitation under acceleration

Common causes

Most likely first

Faulty turbo/supercharger boost control solenoid (wastegate or vacuum solenoid)Likely
Short-to-voltage, open, or damaged wiring in the solenoid control circuitCommon
Loose or corroded electrical connector at the solenoidCommon
Failed PCM/ECM (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data, confirm the code, and inspect the boost control solenoid connector and wiring for shorts or damage.
Test the solenoid's resistance and check its power and ground against spec.
Repair any damaged wiring or corroded connections.
Replace the boost control solenoid if it fails testing.
Re-check for related boost sensor codes and clear; replace the PCM only as a last resort.

FAQ

Quick answers

Is it safe to drive with P0048?+

Short trips are usually okay, but boost control is compromised — overboost can damage the engine and underboost or limp mode saps power, so fix it promptly.

Can I just clear P0048?+

You can, but if the circuit fault is still present it returns quickly and boost stays uncontrolled until repaired.

Read & clear P0048 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