Turbo and boost control
Underboost/overboost, wastegate and variable-geometry actuators, boost pressure sensing. P0299 (underboost) is the single most common fault code in the whole dataset.
26 documented codes across 205 real diagnostics.
Ranked by how often we actually see them
| Code | What it is | Diagnostics |
|---|---|---|
| P0299 | Turbocharger underboost condition | 75 |
| P2563 | Turbocharger boost control position sensor circuit range/performance | 14 |
| P0234 | Turbocharger overboost condition | 13 |
| P2279 | Intake air system leak | 11 |
| P2263 | Turbocharger boost system performance | 11 |
| P0236 | Turbocharger boost sensor A circuit range/performance | 9 |
| P00BD | Mass air flow sensor A circuit range/performance, air flow too high | 9 |
| P0245 | Turbocharger wastegate solenoid A low | 8 |
| P00BC | Mass air flow sensor A circuit range/performance, air flow too low | 7 |
| P2562 | Turbocharger boost control position sensor circuit | 6 |
| P0238 | Turbocharger boost sensor A circuit high | 5 |
| P0049 | Turbocharger turbine overspeed | 4 |
| P2262 | Turbocharger boost pressure not detected, mechanical | 4 |
| P0243 | Turbocharger wastegate solenoid A | 4 |
| P0045 | Turbocharger boost control solenoid circuit open | 3 |
| P0033 | Turbocharger bypass valve control circuit | 3 |
| P226D | Not individually documented | 3 |
| P0047 | Turbocharger boost control solenoid circuit low | 2 |
| P003A | Turbocharger boost control position sensor circuit range/performance | 2 |
| P2270 | O2 sensor signal biased or stuck lean, bank 1 sensor 2 | 2 |
| P2566 | Turbocharger boost control position sensor circuit high | 2 |
| P0037 | O2 sensor heater control circuit low, bank 1 sensor 2 | 2 |
| P0244 | Turbocharger wastegate solenoid A range/performance | 2 |
| P00BE | Not individually documented | 2 |
| P0040 | O2 sensor signals swapped, bank 1 sensor 1 / bank 2 sensor 1 | 1 |
| P0048 | Turbocharger boost control solenoid circuit high | 1 |
FAQ
Frequently asked questions
How do I run a diagnosis?
Select the vehicle on Start, click the Diagnostic card and choose New diagnostic. Fill in the description, the error codes and the mileage, then click Analyze.
Learn more: Diagnostic (vehicle-first start), Diagnostic form: description, error codes and mileage
Do I have to type the codes from my scan tool?
No. Click the camera button next to Error codes and take or choose a photo (JPEG or PNG) of the scan tool's screen; WrenchLane reads the codes and their descriptions into the form. You can also speak them with the microphone.
Learn more: OBD reader photo scan (fault codes from a photo), Voice input for the problem description
Are the public fault code pages built from my diagnostics?
They are built from anonymised, aggregated diagnostics run in WrenchLane; no workshop, customer or vehicle can be identified. Each fault code page shows how often the code was seen across those diagnostics and in how many separate workshops.
Learn more: Fault code pages on wrenchlane.com (fault-code cluster)
Work a turbo and boost control fault on a real car
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