Code Definition

P1021 — Boost Control Actuator Fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Nissan

About P1021

P1021 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1021 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On this Nissan application the engine control module regulates turbocharger boost by commanding the boost control actuator, which on these systems may be an electric wastegate actuator or a boost control solenoid that controls wastegate operation. The module commands a boost level and uses position or feedback signals to confirm the actuator is responding. DTC P1021 is logged when the module detects an abnormal feedback signal or a lack of response from the actuator, with the actuator voltage, resistance, or position feedback deviating beyond the specified thresholds during commanded boost adj...

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