2003 Malibu P0230 Fuel Pump Relay Fault: Diagnosis and Wiring Check
To resolve the P0230 fault code on a 2003 Chevrolet Malibu, begin by verifying the wiring connection between the Powertrain Control Module (PCM) and the fuel pump relay. Specifically, check the wire from the PCM terminal C2 to the relay box E8 C1. Use a test light to verify continuity; if it barely lights up, this indicates weak or intermittent signal. Measure voltage on the DKGRN/WH wire for proper power delivery. Ensure no other diagnostic trouble codes (DTCs) are present before concluding the issue is isolated to the fuel pump relay circuit.
It's extremely difficult to inspect the wiring because they are tightly bundled and hard to access individually.