A P0262 code on your 2021 Acura RDX indicates a high voltage condition detected in the cylinder 1 fuel injector circuit. The RDX's 2.0L turbocharged engine requires precise injector control, making this code important to address.
RDX Fuel Injection System
The 2021 RDX uses a 2.0L VTEC Turbo direct injection engine producing 272 horsepower. The high-pressure fuel system delivers fuel directly into the cylinders. Each injector is controlled by a dedicated driver circuit in the ECU, and P0262 indicates the cylinder 1 circuit is showing higher voltage than expected.
High Circuit Causes
High voltage readings typically result from an open circuit condition—a disconnected injector, broken wire, or failed injector coil with high internal resistance. The ECU interprets the lack of current flow (open circuit) as a high voltage condition because it sees the full reference voltage without current draw.
Diagnostic Steps
Start by checking the cylinder 1 injector connector—ensure it's fully seated. Measure injector resistance; an open coil will show infinite ohms. Test circuit continuity from connector to ECU pins. If the injector was recently serviced, verify it's properly reconnected. Check for any TSBs related to injector harness issues.
Repair Requirements
An open injector requires replacement. On the RDX, the fuel rail must be removed for injector access—depressurize the fuel system first. If wiring is broken, locate and repair the open section. Use genuine Acura parts for direct injection components given the high-pressure system requirements.