P1546 Boost Pressure Control Valve (N75) - Short to B+ (Positive)
A wire in this circuit is touching a live positive feed, so the part sees power when it shouldn't.
Can you drive it? The car is most likely in limp mode with boost cut. It is drivable gently, but it will not make full power and should not be driven hard until it is fixed.
The definition
P1546: Boost Pressure Control Valve (N75) - Short to B+ (Positive).
P1546 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
What to check first
Cheapest and fastest checks first:
- With the connector unplugged and ignition on, check whether the signal pin already has battery voltage on it. It should not.
- Check for a chafed wire lying against a live feed, especially in looms that run alongside the starter or alternator cabling.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Prefer to work on your phone? The VAGPULSE Android app is a free download and its demo mode runs against a sample car with no hardware at all, so you can see exactly what it reads before spending anything. Reading your car with it needs the VAGPULSE cable, which comes with the licence.
Common questions
What does P1546 mean?
P1546 means Boost Pressure Control Valve (N75) - Short to B+ (Positive). A wire in this circuit is touching a live positive feed, so the part sees power when it shouldn't.
Can I drive with P1546?
The car is most likely in limp mode with boost cut. It is drivable gently, but it will not make full power and should not be driven hard until it is fixed.