P0243 on Audi
Turbocharger/Supercharger Wastegate Solenoid "A" Malfunction
P0243 on Audi vehicles indicates turbocharger/supercharger wastegate solenoid "a" malfunction. Au7o has documented this code across 4 Audi models — most commonly on A7, S5, S8. This code indicates a general fault with turbocharger/supercharger wastegate solenoid "A," which the engine control module uses to manage boost pressure. The computer has detected the solenoid or its circuit is not responding correctly (open, shorted, or out of expected operating range). Because it governs boost, a fault can lead to overboost or underboost, reduced power, or a limp mode. Typical repair costs on Audi range from $300 to $5,000, depending on the specific model and root cause.
Common Causes of P0243
- •Failed or sticking wastegate solenoid
- •Open or shorted wiring in the solenoid circuit
- •Corroded or damaged electrical connector
- •Mechanical wastegate sticking or binding
- •Vacuum/boost hose leaks or blockage
- •Faulty ECM/PCM solenoid driver (rare)
P0243 on Audi by Model
Audi A7(1 issue)
- Supercharger Clutch and Isolator Failure (S7 3.0T)2012-2018
The S7 with the 3.0T supercharged V6 (2012-2018) uses an electromagnetic clutch to engage the supercharger. Over time, the clutch disc wears out or the torsional isolator (damper) fails, creating a loud rattling, grinding, or "bag of marbles" sound from the front of the engine. This is most noticeable on cold starts or under load. A failed clutch prevents the supercharger from engaging, causing significant power loss. A failed isolator damages internal supercharger components, requiring complete supercharger replacement. Oil contamination accelerates wear—if oil becomes contaminated with dirt or debris, it causes premature failure of internal components. AudiWorld forums report failures between 60,000-120,000 miles, with repair costs of $1,500-$5,000.
Audi S5(1 issue)
- 3.0T Supercharger Intercooler Pump Failure2008-2025
The water-to-air intercooler system on the S5 3.0T uses an electric coolant pump that can fail, causing elevated charge air temperatures and reduced power. Heat soak becomes severe in warm climates.
Audi S8(1 issue)
- 4.0T Turbo Coolant System Degradation2013-2024
The S8 4.0T V8 shares coolant line issues with other 4.0T Audi models but the heavier sedan and higher power tune accelerate wear. Turbo oil and coolant line failures can cause expensive damage if not caught early.
Audi SQ5(1 issue)
- 3.0T Supercharger Bearing and Intercooler Pump Failure2014-2018
The SQ5 3.0T supercharged V6 shares supercharger nose bearing issues with the S4/S5. The intercooler water pump also fails, causing heat soak and reduced performance, especially in warmer climates.
Looking for P0243 on a different make?
View P0243 across all makes →Frequently Asked Questions
What does P0243 mean on Audi?▼
P0243 stands for "Turbocharger/Supercharger Wastegate Solenoid "A" Malfunction." This code indicates a general fault with turbocharger/supercharger wastegate solenoid "A," which the engine control module uses to manage boost pressure. The computer has detected the solenoid or its circuit is not responding correctly (open, shorted, or out of expected operating range). Because it governs boost, a fault can lead to overboost or underboost, reduced power, or a limp mode. On Audi specifically, this code is documented across 4 models.
What causes P0243 on Audi vehicles?▼
Common causes on Audi: Failed or sticking wastegate solenoid, Open or shorted wiring in the solenoid circuit, Corroded or damaged electrical connector, Mechanical wastegate sticking or binding, Vacuum/boost hose leaks or blockage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0243 on a Audi?▼
Repair costs on Audi range from $300 to $5,000, depending on the specific model and root cause.
Which Audi models have P0243 documented?▼
Au7o has documented P0243 on 4 Audi models: A7, S5, S8, SQ5.