What P0243 means
P means powertrain (engine and transmission). The 0 marks a generic code defined by SAE, so the same number means the same thing across makes. The third character, 2, places it in the fuel and air metering, injector circuits subsystem; the last two digits identify the specific fault.
The wastegate solenoid controls how much exhaust bypasses the turbine and therefore how much boost the turbo makes. The engine computer pulses it and monitors its control circuit.
The letter "A" distinguishes between two or more of the same component on one vehicle. Which physical part is "A" is set by the manufacturer, so confirm it in the service information before replacing anything.
What “Circuit” means here
"Circuit" is the broadest fault type in the standard. The module has found the turbocharger wastegate solenoid circuit electrically unusable: the signal is missing, outside its electrical limits, or the module's own self-test of the circuit failed. Some vehicles set this instead of the more specific low/high codes; others set it alongside them. Either way the first suspect is the wiring and connector, then the component, and only then the module.
What you may notice
Symptoms depend on the vehicle and on how the module responds to the fault. Any of these can accompany P0243:
- Loss of power
- Overboost or underboost codes stored alongside
Where to start diagnosing P0243
- Inspect the solenoid connector and its vacuum or pressure hoses.
- Measure solenoid resistance against specification.
- Use an actuator test, where available, to confirm the solenoid responds.
Clear the code only after recording freeze frame data: it shows the engine speed, load and temperature at the moment the fault set, which is often the best clue to reproducing it.
Live data to watch
These standard OBD2 values relate to P0243. Support varies by vehicle; a value your car does not report will simply be missing.
| Value | What to look for |
|---|---|
| Intake manifold absolute pressure (PID 0x0B) | Boost response. |
| Boost pressure control (PID 0x70) | Where supported, commanded duty and boost. |
Related codes
Codes from the same turbocharger wastegate solenoid family. If several are stored together, the shared part — wiring, a common reference voltage, or the component itself — is the place to start.
| Code | Definition |
|---|---|
| P0244 | Turbocharger/Supercharger Wastegate Solenoid "A" Range/Performance |
| P0245 | Turbocharger/Supercharger Wastegate Solenoid "A" Low |
| P0246 | Turbocharger/Supercharger Wastegate Solenoid "A" High |
| P0247 | Turbocharger/Supercharger Wastegate Solenoid "B" |
| P0248 | Turbocharger/Supercharger Wastegate Solenoid "B" Range/Performance |
| P0249 | Turbocharger/Supercharger Wastegate Solenoid "B" Low |
| P0250 | Turbocharger/Supercharger Wastegate Solenoid "B" High |
Further reading
Frequently Asked Questions
What does P0243 mean?
P0243 is the generic SAE J2012 code for "Turbocharger/Supercharger Wastegate Solenoid "A"". In plain terms, it means the engine computer has detected a "circuit" fault on the turbocharger wastegate solenoid.
Can I keep driving with P0243?
Drive gently: boost control is compromised until it is fixed.
What should I check first for P0243?
Inspect the solenoid connector and its vacuum or pressure hoses.
Definition source: SAE J2012 / ISO 15031-6 generic DTC definitions. This is the generic meaning that applies across makes; a manufacturer can define a code more narrowly or add its own sub-codes, so confirm against the service information for your vehicle before replacing parts. Written by the OBDAssistant engineering team — see our editorial policy.