Code Definition

P0077 — Intake Valve Control Solenoid Circuit High (Bank 1)

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

About P0077

P0077 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 P0077 is stored, the module has detected a signal or supply voltage higher than the expected operating range; 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 P0077 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 P0077 code indicates a high voltage condition in the control circuit of the intake valve control solenoid for Bank 1. This solenoid is a crucial component of the engine's variable valve timing (VVT) system, responsible for managing the timing and operation of the intake valves. The Engine Control Module (ECM) sets this code when it detects that the voltage in the solenoid circuit is higher than expected. A high voltage situation in this circuit can lead to issues with the VVT system's functionality, impacting engine performance, fuel efficiency, and emissions.

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