What it means
The Turbocharger/Supercharger Boost Sensor C circuit reading is outside its expected range or performance. The code alone does not establish a comparison strategy or identify sensor drift, a hose, or contamination.
At a glance
- Usually lights the check-engine light
How it works
This code applies to turbocharger or supercharger boost sensor C when its signal is electrically plausible but falls outside the expected range or does not behave as expected. The module flags the sensor C reading; the code alone does not identify drift, a blocked sensing hose, or the comparison method used.
Common causes
Most likely first.
- Sensor drift after thermal aging
- Sensing hose blocked by oil residue
- Sensor element aged beyond calibration window
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
How to diagnose it
- Save freeze-frame data and compare live data from boost sensor C with engine load and any other available boost readings to see when its value becomes implausible.
- Inspect sensor C and any fitted pressure sensing hose for oil residue, blockage, cracks, or a loose connection.
- Check the sensor C connector and harness for corrosion, poor terminal contact, damaged insulation, or intermittent breaks.
- Verify sensor C power, ground, and signal behavior through the operating range using the manufacturer's procedure and specification.
- If the hose and wiring pass, evaluate sensor C for thermal drift or aging against the manufacturer's test criteria and confirm the fault after repair.
Common fixes
- Clear an oil-residue blockage from the sensor C sensing hose, if fitted, and repair any damaged hose.
- Clean and secure poor connections at the sensor C connector.
- Repair wiring faults that interrupt or distort the sensor C signal.
- Replace sensor C if its reading remains out of range or drifts beyond the specified calibration window.
Can I keep driving?
Reduced or unpredictable boost can leave the vehicle short of power, so avoid hard acceleration and risky overtaking. Stop if power loss becomes severe, smoke increases, or a new whistling or hissing sound develops.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.