P0283 Mercedes-Benz Code - Cylinder 8 Injector Circuit High

P0283 indicates a "Cylinder 8 Injector Circuit High" fault, meaning the fuel injector circuit for cylinder 8 is experiencing abnormally high voltage.

Symptoms may include rough idling, reduced engine performance, poor fuel economy, misfires, and the check engine light turning on.

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning driver in the engine control module (ECM), or corrosion in the electrical connections.

While the vehicle may still be drivable, it is not recommended to continue driving as prolonged issues with the injector circuit can lead to further engine damage or poor performance.

Diagnosis involves inspecting the wiring and connectors for damage or corrosion, testing the fuel injector for proper resistance, and using a multimeter or scan tool to check voltage in the injector circuit.

Repairs may include replacing the faulty fuel injector, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or reprogramming or replacing the ECM if necessary.

Common tools include an OBDII scanner, a multimeter, and possibly an injector tester to measure resistance and voltage in the circuit.

Repair costs can vary, with fuel injector replacement typically costing $150-$300 per injector plus labor, while wiring repairs or ECM replacement can add to the expense.

A dirty or clogged injector is less likely to cause this code, as it specifically relates to high voltage in the circuit rather than mechanical clogging. However, it’s worth inspecting if no electrical issues are found.

Clearing the code with a scan tool may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.