P0243–P0247 Turbocharger Wastegate Solenoid A Malfunction
The ECU sees a problem in this circuit but cannot narrow it to a specific short or open. Start at the connector and the wiring before condemning the part.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P0243 | Turbocharger Wastegate Solenoid A Malfunction | Investigate soon |
P0247 | Turbocharger Wastegate Solenoid B Malfunction | Investigate soon |
The definition
P0243: Turbocharger Wastegate Solenoid A Malfunction.
P0243 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
- Check the connector at the part for corrosion, and that it is fully seated.
- Clear the code and see whether it returns, and under what conditions.
What actually causes this on a VAG
On most VAG turbo engines, boost isn't controlled by the wastegate spring alone - a small electrical solenoid, the N75 valve, meters vacuum or pressure to the wastegate actuator, and on TDIs the same sort of valve controls the turbo's variable vanes. (Newer TSI and TFSI engines use an electric wastegate actuator instead, which the ECU monitors differently, so this code belongs mainly to the solenoid-and-vacuum generation of engines.) P0243 is the ECU complaining about the electrical side of that control: it can't drive the solenoid properly, or it sees an open or shorted circuit. The car will often feel down on power and may drop into a reduced-boost limp mode.
Most likely causes, in order
- Connector or wiring at the solenoid. The valve lives in a hot, vibrating part of the engine bay, and the plug's locking tab breaks, the pins corrode, or the short tail of loom chafes. Unplug it, look at the pins, and check the wiring back towards the loom. This is the first thing to rule out because it costs nothing but time.
- The solenoid itself has failed. The coil can go open circuit, and the valve can be gummed up internally by oil carried over from the crankcase breather system. Resistance across the coil compared against the figure in the manual for your specific engine, or a swap for a known-good valve, settles it. On the older 1.8T and similar engines the N75 is a familiar wear item and not an expensive part.
- Harness damage or ECU driver fault. A break further back in the loom, or in rare cases the output driver inside the ECU, will produce the same complaint. This is only a sensible conclusion once the valve and its immediate wiring have been proven good. It needs proper testing at the ECU connector rather than parts swapping.
Worth knowing: This is a circuit code, not a boost code - the ECU is complaining about the electrical connection to the valve, not about how much boost it's getting. Split hoses, a leaking actuator or a sticking wastegate normally show up instead as underboost or boost-deviation codes. So check the plug and the valve before anyone starts chasing boost leaks or, worse, quotes you for a turbo.
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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Common questions
What does P0243 mean?
P0243 means Turbocharger Wastegate Solenoid A Malfunction. The ECU sees a problem in this circuit but cannot narrow it to a specific short or open. Start at the connector and the wiring before condemning the part.
Can I drive with P0243?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.