Quick answer
P0243 is the SAE-defined base code for Turbocharger/Supercharger Wastegate Solenoid A. The five-character code does not by itself prove that the solenoid, wastegate or turbocharger has failed, and it does not identify one universal monitored failure type. Save the scan-tool wording, code status, any displayed suffix, freeze-frame data and companion codes; then identify the control design by VIN and test its connector, feed, driver circuit and applicable vacuum or actuator path before replacing parts.
1What Does the P0243 Code Mean?
The current SAE J2012 five-character description is Turbocharger/Supercharger Wastegate Solenoid A. Bare P0243 is a base DTC and does not encode one universal monitor or failure mode. Vehicles that report a failure-type byte may display P0243-13, P024313 or P0243:13; :13 means Circuit Open. Other failure-type bytes can identify electrical or functional conditions. Preserve the complete OEM wording and use the exact-VIN test plan.
A wastegate controls turbine energy and therefore boost. On some engines, the PCM pulses a solenoid that routes pressure or vacuum to a pneumatic actuator. Other engines use an electronic actuator or a differently named boost-control valve. “A” distinguishes the first designated wastegate-control channel; it is not the same as Bank 1 and does not give a universal physical location or hose.
Circuit code versus boost result: P0243 points first to the commanded control path. P0234 and P0299 describe measured overboost or underboost results. A vehicle may store more than one code, but P0243 alone does not tell you whether boost is too high or too low.
How neighboring codes differ
| Code | General description | Key distinction |
|---|---|---|
| P0243 | Wastegate Solenoid A | Base code; retain the OEM description and any displayed failure-type suffix. |
| P0244 | Wastegate Solenoid A range/performance | The monitored response is outside the calibrated range or performance model. |
| P0245 | Wastegate Solenoid A low | A low electrical signal/voltage classification; it does not mean low boost. Use the OEM test plan to identify the actual circuit fault. |
| P0246 | Wastegate Solenoid A high | A high-circuit classification requiring the OEM circuit test. |
| P0234 | Turbocharger/supercharger overboost | Actual boost is judged too high; it does not identify the failed component. |
| P0299 | Turbocharger/supercharger underboost | Actual boost is judged too low; it is not the same code category. |
2Common P0243 Symptoms
A steady MIL may be the only visible sign when the fault is intermittent.
The PCM may limit torque or boost because normal wastegate control is uncertain.
Boost response can feel delayed, inconsistent or unavailable under load.
Some vehicles restrict throttle, engine speed or boost until the fault is repaired.
Smoke, rough running, hissing or turbo noise are not required P0243 symptoms. If they appear, inspect them as separate evidence and review all companion codes rather than assuming the solenoid caused every complaint.
3What Can Cause P0243?
- A loose connector, water intrusion, corrosion, spread terminal, backed-out pin or poor prior repair.
- An open, short-to-ground, short-to-power or high-resistance solenoid feed or PCM-controlled circuit.
- Harness insulation melted or chafed near the turbocharger, exhaust, brackets or moving parts.
- A blown shared fuse, failed relay/feed or abnormal system voltage. Find the short before replacing a fuse again.
- An electrically failed solenoid or actuator, such as an open or shorted coil or an intermittent internal connection; mechanical sticking matters only when the full OEM DTC/failure type includes a functional check.
- When the OEM test plan, failure type or companion codes make the functional path relevant: disconnected, split, blocked or incorrectly routed pressure/vacuum hoses.
- A binding wastegate lever, actuator or linkage when that application includes a functional check.
- An exact-VIN calibration issue documented by an OEM bulletin.
- A PCM output-driver/module fault, considered only after external circuit and load tests pass; verify PCM power and grounds before condemning the module.
Do not begin with a turbocharger. P0243 can be set by a connector, wire, shared feed or control solenoid while the turbocharger itself is mechanically healthy.
4Can You Drive with P0243?
If P0243 is the only code, the MIL is steady, engine behavior is normal and no critical warning is present, a short low-load trip to a repair location may be reasonable if the owner's manual permits it. Avoid towing, steep grades, hard acceleration and high-speed passing until boost control is verified.
Stop safely and arrange towing for severe power loss that makes merging unsafe, a separate overboost warning, abrupt unsafe engine response, heavy smoke, oil-pressure or temperature warning, metallic contact or abnormal turbocharger noise. A flashing MIL usually points to a severe misfire rather than P0243 itself, but it also requires immediate load reduction and prompt service.
5How to Diagnose P0243
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Save the complete scan
Record confirmed/MIL-on, pending and permanent DTCs, plus any OEM current/history status available, exact P0243 wording, any displayed suffix, freeze-frame data, ECU identification and companion boost, voltage or sensor codes before clearing anything.
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Identify the system by VIN
Use current service information to locate Solenoid A, its fuse/feed, PCM driver, connector and hose routing. Confirm whether the vehicle uses a pressure/vacuum solenoid, smart electric actuator or another OEM strategy, and check exact-VIN bulletins and calibration information.
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Inspect after the system cools
Switch the ignition off as directed, let the turbocharger and exhaust cool, then check connector locks, seals, pin fit, harness heat/abrasion and applicable hoses. Keep hands and tools clear of an electronic actuator linkage because it may move during key-on self-tests.
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Verify voltage and shared supply
Check battery/charging condition and the correct fuse, relay or common feed with the wiring diagram. Load-test suspect supply and ground paths instead of accepting an unloaded voltage reading.
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Use supported scan evidence
Where the VIN and ECU provide it, observe wastegate command/position, solenoid duty, desired versus actual boost, MAP and BARO. A supported active test can request operation, but it does not prove that the PCM driver switched, that voltage or current reached the load, or that the actuator moved; continue with the applicable electrical, pneumatic or mechanical tests in the OEM plan.
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Test the solenoid and driver circuit
With connectors and modules handled exactly as service information requires, measure coil resistance, continuity, shorts and voltage drop against the correct temperature-dependent OEM specification. There is no universal resistance, voltage or duty-cycle target.
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Test the actuator path when directed
When the failure type or companion codes support it, use the specified hand vacuum/pressure equipment to verify pneumatic hose integrity and actuator movement, or follow the electronic actuator initialization and position checks. Never jumper a PCM driver or smart actuator to battery voltage or ground, and never alter wastegate-rod preload unless the OEM procedure explicitly requires it.
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Consider PCM hardware last
If the bulletin/calibration check in Step 2 does not identify an applicable software repair, condemn or replace the PCM only after its power and grounds and the external feed, load and driver circuit pass the OEM tests. Program a module only under the applicable OEM procedure.
6P0243 Repairs and Typical US Costs
The correct repair follows the failed test: restore a terminal or wire, repair a feed, replace a diagnosed solenoid, correct a hose or linkage fault, repair a proven actuator, or apply an exact-VIN calibration. Do not add every possible repair together, and replace a turbocharger or PCM only after direct evidence proves it.
| Confirmed service path | Planning estimate |
|---|---|
| Professional general diagnosis | $122–$179 |
| Turbocharger boost-pressure solenoid replacement | $201–$239 |
| Fuse, connector, wiring, hose or linkage repair | VIN/job-specific quote |
| Electronic actuator, PCM or turbocharger work | Quote after direct testing |
RepairPal last updated both cited national estimates August 7, 2026. Estimates exclude taxes, location differences and related work. A P0243 code alone does not authorize solenoid, actuator or turbocharger replacement.
7Using iCarsoft CR Eagle for P0243
On supported vehicles, CR Eagle can retrieve available P0243 status and freeze-frame data, scan other modules for companion faults, view supported engine data and save a diagnostic report. Wastegate command/position, boost-control duty, desired/actual pressure, graphing and active tests depend on the make, model, year, ECU and installed software; confirm the exact VIN before relying on a specific function.
A focused CR Eagle workflow
- Run a full scan and save the exact P0243 wording, available freeze frame and companion codes.
- Create a focused live-data view using only supported wastegate, boost, MAP, BARO, engine-speed and load items needed for the test.
- Use a supported active test only within OEM enable conditions, while a second person safely observes the component and external test equipment.
- Save a post-repair scan and data record under the same applicable conditions.
Wastegate-control scan evidence on supported vehicles
iCarsoft CR Eagle
Preserve the full scan, review supported wastegate and boost data, run VIN-supported active tests and document the vehicle before and after the verified repair.
Check current CR Eagle availability Check CR Eagle compatibility by VINCapability boundary: CR Eagle cannot directly measure coil resistance, circuit voltage drop, vacuum, physical boost pressure or mechanical wastegate movement, and it cannot prove a solenoid or turbocharger has failed from P0243 alone. Use the required wiring diagram, meter, scope, hand pump, pressure gauge and mechanical inspection. Keep CR Eagle current through its built-in Wi-Fi update function.
8Verify the Repair
- Complete the evidence-based connector, circuit, solenoid, hose, linkage, actuator or software repair.
- Repeat the relevant supply, voltage-drop, resistance, vacuum or actuator test and confirm it now meets the OEM specification.
- Safely repeat the monitor enable conditions and compare supported command with actual wastegate or boost response.
- Rescan for current and pending faults and confirm the required readiness status.
A permanent code can remain after repair. A permanent P0243 may remain after the MIL turns off. A scan tool or battery disconnect cannot erase it; the OBD system clears it only after its prescribed verification criteria are met. Its presence immediately after repair, by itself, does not prove that the fault is still active.
9Related Boost and Wastegate Code Guides
10P0243 FAQ
What does code P0243 mean?
P0243 is the SAE-defined base code for Turbocharger/Supercharger Wastegate Solenoid A. Preserve the exact OEM description and any failure-type suffix because the bare five-character code does not define one universal open, low, high or functional test.
Does P0243 mean the wastegate solenoid is bad?
No. A connector, wire, shared feed, fuse, electrically failed solenoid/actuator or rare PCM driver problem can produce P0243. Hose or mechanical faults matter only when the full OEM failure type or companion codes point to a functional wastegate problem.
Where is Wastegate Solenoid A located?
Location varies by VIN and control design. It may be near the turbocharger, on a bracket or remote in a pressure/vacuum hose circuit; some vehicles use a smart electronic actuator instead. Use the exact component locator and hose/wiring diagram.
Can a blown fuse cause P0243?
Yes, when the correct fuse supplies the solenoid or a shared control circuit. If it blows again, stop replacing it and locate the short or overloaded component using the vehicle wiring diagram.
Can I drive with P0243?
A short low-load trip may be reasonable when the MIL is steady, performance is normal and no critical warning is present. Stop and tow for a flashing MIL, unsafe power loss, a separate overboost warning or abrupt unsafe engine response, heavy smoke, temperature or oil-pressure warning, or abnormal turbo noise.
Can CR Eagle diagnose P0243?
On supported vehicles, CR Eagle can save available code and freeze-frame evidence, scan companion faults, view supported boost/wastegate data and run VIN-supported active tests. It does not replace electrical, vacuum, pressure or mechanical testing.
Technical and cost references
- Current SAE J2012 diagnostic trouble-code definitions.
- Ford OBD System Operation: wastegate open-load and short-circuit monitor example.
- Ford 2024 OBD System Operation: electronic-wastegate circuit and functional failure types.
- Toyota/NHTSA P0243-13 circuit-open and calibration example.
- Audi/NHTSA application-specific P0243, P0245 and P0246 distinctions.
- California BAR permanent-DTC guidance.
- RepairPal estimates for general diagnosis and turbocharger boost-pressure solenoid replacement.
Product information: Official iCarsoft CR Eagle page. Coverage and functions vary by vehicle; confirm the exact VIN before purchase.
Editorial note: This guide provides general diagnostic education and does not replace the service manual, wiring diagram, safety instructions or hands-on tests for the exact vehicle. Solenoid A location, circuit design, hose routing, monitor thresholds, enable conditions and CR Eagle coverage vary by VIN. Product availability and repair costs can change.
