P2733: GR10 clutch C6 fails to release during a shift

P2733 is the stuck-on diagnosis for pressure-control solenoid F in this GR10 section. It concerns C6 hydraulic release. The monitor assumes functional electrical control and asks whether the off-going clutch still holds torque after pressure should have been removed.

The release signature

C6 slip remains below the expected release threshold: below 50 rpm for the listed power-down and other shift branches, or below 100 rpm for garage shifts. Shift-dependent base timers, additional offsets and hydraulic exhaust allowances govern reporting. The source assigns Type A, one trip.

The supporting closed-throttle lift-foot-upshift table gives different exhaust delays with fluid temperature, including 1.6 seconds at −40°C and 0.85 seconds at 30°C. Applying one timing value to every shift would ignore that dependency.

Using the result

Compare the release request with C6 slip after its permitted exhaust interval. Near-zero slip is only suspicious in this context because the clutch is supposed to stop holding. Valid shaft-speed signals and absence of competing electrical or performance faults are prerequisites.

This is the opposite hydraulic behavior from P2732's excessive slip after application. A correct resistance reading does not prove that C6 releases hydraulically. Verification should use the qualified release monitor through the applicable professional procedure; the source does not establish a particular valve-body or clutch repair from the code alone.

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 2243. GM diagnostic parameters, PDF page 2244. GM diagnostic parameters, PDF page 2245. GM diagnostic parameters, PDF page 2246. GM diagnostic parameters, PDF page 2248. GM diagnostic parameters, PDF page 2462.