Code Definition

P2090 — B Camshaft Position Actuator Control Circuit Low - Bank 1

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

About P2090

P2090 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 P2090 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 P2090 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

DTC P2090 is set when the Engine Control Module (ECM) detects a low voltage condition in the camshaft position (CMP) actuator control circuit for the exhaust camshaft ('B' camshaft) on Bank 1. This indicates a possible issue with the actuator, wiring, or control signal, which can affect variable valve timing (VVT) operation, leading to poor engine performance or increased emissions.

Quick Facts