P233A: fuel metering valve 2 open-load detection

P233A is generically described as fuel pressure regulator C control circuit/open. This GM table identifies the monitored component more specifically as fuel metering unit valve 2. Confirm that naming in the vehicle's service information before assuming that regulator lettering names a particular installed part.

The open-circuit evidence

The controller looks for low current between the high-side and low-side drivers while they are on. The table associates that state with more than 200 kilohms between the valve's driver pins. This is an electrical continuity diagnosis, not a test that rail pressure reached its target.

Powertrain relay voltage must exceed 11 V, engine cranking must be false, and run/crank must be active. The row gives a 100 ms sample interval and Type A, one-trip reporting, but omits the failure-count numbers. An exact setting duration cannot be reconstructed from that incomplete counter.

What to check next

Retain the output command and open-load status to distinguish a disconnected electrical path from a connected valve with a separate hydraulic performance problem. Follow the vehicle-specific circuit procedure to identify the high-side and low-side connections. Do not apply a resistance test to an energized circuit or open high-pressure fuel plumbing on the strength of this code. Verification requires the qualified electrical monitor to accept the circuit again; a pressure reading alone is insufficient.

Source and application limits

This explanation covers the cited 2025 GM monitor. Confirm the vehicle and calibration in its service information before applying these limits; inclusion in this file does not establish model compatibility. GM diagnostic parameters, PDF page 816.