Code Definition

P0027 — Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 1)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0027

P0027 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0027 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0027 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0027 code indicates an issue with the range or performance of the exhaust valve control solenoid circuit in Bank 1. This code is set by the ECM (Engine Control Module) when it detects that the exhaust valve control solenoid's operation is outside the expected range or performing inadequately. The exhaust valve control solenoid is a key component of the variable valve timing (VVT) system, responsible for adjusting the operation of the exhaust valves to enhance engine performance and efficiency.

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