Code Definition

P0661 — Variable intake air solenoid circuit voltage low - Bank 1

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

About P0661

P0661 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 P0661 is stored, the module has detected a signal or supply voltage lower 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 P0661 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 fault code P0661 is set when the Engine Control Module (ECM) detects a lower than expected voltage in the circuit controlling the Variable Intake Air System Solenoid for Bank 1. This solenoid is part of the system that adjusts the intake manifold's airflow to optimise engine performance across different RPM ranges. A low voltage in the solenoid's control circuit can indicate issues such as a partial short to ground, excessive resistance in the circuit, or problems with the ECM's output to the solenoid. This condition can affect the proper operation of the variable intake system, potentiall...

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