P1333 — Turbo High-Side Boost Voltage Too High

What exactly does P1333 report?

P1333 reports abnormally high supply voltage in the turbocharger or booster high-side boost-control circuit. The fault may involve the solenoid, actuator, wiring, connector, ground, charging system, or controller.

Does P1333 prove the turbocharger is damaged?

No. P1333 does not by itself prove a failed turbocharger; a shorted control solenoid, damaged harness, poor connection, excessive charging voltage, or faulty controller can all produce this code.

Is it safe to drive with P1333 stored?

If boost remains normal and no warning symptoms appear, avoid heavy acceleration and schedule diagnosis promptly. Do not continue driving if boost rises unexpectedly, the engine runs rough, or the vehicle enters reduced-power mode.

What should be checked first for P1333?

Start by confirming the code and freeze-frame data with an OBD scanner, then inspect the boost-control connector and wiring. Back-probing the supply, control, and ground circuits can distinguish an actuator short from a harness or charging-system problem.

When your vehicle's onboard computer spots something wrong with a sensor or actuator circuit, it logs a diagnostic trouble code. P1333 is one of those codes that gets triggered when the module detects abnormal behavior—not just a single blip, but a pattern that persists under specific driving conditions. Think of the engine control unit as a careful auditor: it won't flag a problem based on one bad reading alone. Instead, it waits until the fault shows up repeatedly before illuminating that Check Engine light on your dashboard. The code also captures a freeze frame snapshot—showing engine load, RPM, coolant temperature, and vehicle speed at the exact moment the problem occurred. That data is gold when you're trying to reproduce the fault during diagnosis.

P1333 doesn't point a finger at one specific part. It's a broad signal that something in the affected circuit isn't behaving as it should. The affected circuit could involve various components depending on your vehicle—sensors that monitor everything from position to temperature, or actuators that control valves and motors. What matters is that the control module expects a certain voltage range or signal pattern, and when it doesn't see it consistently, P1333 gets stored. The good news is that this code gives you a starting point: inspect the circuit, check the connections, and narrow down whether you're dealing with a wiring issue, a failed component, or something else entirely.

How your car actually behaves when P1333 is active depends on which circuit is malfunctioning. Some drivers notice barely anything—the light comes on, but the vehicle seems fine. Others experience noticeable driveability problems. Either way, ignoring the code isn't ideal, because the underlying issue won't fix itself.

Symptoms

• The Check Engine light stays illuminated on the instrument cluster
• The vehicle may enter limp mode, limiting power and speed to protect itself
• The specific system tied to the faulty circuit might work intermittently or stop functioning altogether
• Fuel economy can climb higher than normal in certain cases
• Performance may feel sluggish or unresponsive
• In rare instances, you might notice unusual behavior from related systems

Causes

• A weak or corroded ground connection disrupting proper circuit operation
• A blown fuse that cuts power to the affected circuit
• A driver fault within the control module itself
• Wiring that has become open (broken) or shorted (touching where it shouldn't)
• The sensor or actuator at the end of the circuit has failed
• Connectors that are damaged, dirty, or not seating properly

How to Diagnose P1333

1. Hook up an OBD2 scanner and verify that P1333 is indeed stored in the system. Record the freeze frame data—this snapshot tells you engine load, RPM, coolant temperature, and vehicle speed when the fault first appeared.

2. Look for any related diagnostic codes alongside P1333. Accompanying codes often point toward the root cause, such as a short circuit or failed component. Also check manufacturer technical service bulletins for your specific make and model—some P0xxx codes have documented factory fixes or software updates available.

3. Get your hands on the wiring diagram for the affected circuit. Visually inspect the harness and connectors for frayed wires, corrosion, broken insulation, or any signs of poor electrical contact.

4. At the component connector, use a multimeter to check reference voltage, ground integrity, and signal continuity. Compare your readings against specifications in the service manual.

5. Perform a wiggle test on the harness while monitoring live data on your scanner. If the signal drops out or fluctuates when you move the wiring, you've found a broken conductor hidden inside the insulation.

6. After clearing the code, run the vehicle through a complete drive cycle—replicating the conditions captured in the freeze frame. If P1333 comes back, the fault is confirmed and still present.

Repair Options

Depending on what's actually broken, here's what you might need:

• Replace the faulty sensor or actuator: $150–$500
• Control module diagnosis and repair: $300–$1,000
• Repair damaged wiring or connectors: $80–$250

Always start with the cheapest and most common culprits before committing to expensive component replacement.

How Much Does It Cost to Fix P1333?

P1333 repair costs span a wide range because the problem could be anything from a simple bad connector to a failed control module. Parts and labor at independent shop rates break down as follows: wiring or connector repair runs $80–$250, sensor or actuator replacement costs $150–$500, and control module work lands at $300–$1,000. Most P1333 repairs fall somewhere in the $80 to $1,000 range. Getting an accurate diagnosis before buying parts is the smartest move—the most expensive scenario is rarely where you should start looking.

Can You Drive with P1333?

In most cases, your vehicle remains driveable if P1333 is stored, though you might notice reduced performance or a disabled auxiliary system. That said, if the car exhibits stalling, fails to start, or displays warnings related to brakes or steering, treat this as urgent and stop driving immediately.

Related OBD2 codes

• P1300: Multi-faults - Bank 1 - With Low Side Shorts
• P1301: Multi-faults - Bank 2 - With Low Side Shorts
• P1302: Injector High Sides Shorted Together
• P1303: IDM Failure
• P1304: Cylinder Head Overtemperature Protection Active
• P1305: Boost Calibration Fault