6L50 Valve Body, new and ready to install. Fits the 6L50. Ships fast from the USA.
If your 2008-2018 Cadillac CTS, STS, Camaro V6 or BMW on the GA6L45R platform (1, 3 or 5-Series) is throwing a propulsion-related code, shifting harsh, or has lost drive intermittently, the 6L50's valve body and the TEHCM mounted to it are the usual place the fault starts. This is a new Sonnax valve body for the 6L50, built to replace a worn unit so you install a known-good part instead of chasing a pressure-switch or solenoid fault one component at a time.
The 6L50 is a six-speed, electronically controlled automatic in the same GM 6L-family as the 6L45, and its valve body carries the TEHCM - the transmission electro-hydraulic control module - which reads a set of internal pressure switches to confirm which range and clutch state the valve body has actually achieved, not just which one the computer commanded. Sonnax's technical writeup on these pressure switches explains they serve two jobs at once: gear selection feedback and clutch-fill timing, through a normally-closed design that only opens once the clutch regulator valve routes pressure to it.
Gears Magazine documented a 6L50/80/90-family issue tied to a Bosch capacitor built into certain TEHCM units manufactured between late July and late September of 2017, which can affect the module's own microprocessor operation and trigger propulsion-related faults that look mechanical but are not. Check your stored codes and, if your TEHCM falls in that production window, rule out the module before resurfacing the valve body underneath it. Our 6L45/6L50 limp mode causes and diagnosis guide covers the broader code-reading process this platform shares.
This valve body is built for the 6L50 as used in the 2008-2018 Cadillac CTS and STS, the Camaro V6, and the related GA6L45R-platform BMW applications. Sonnax's own vacuum-test documentation for this family lists a distinct shift-solenoid and pressure-control-solenoid application chart for every range, with normally-low and normally-high designations that differ by RPO code, so the 6L50 (RPO MYB) is not interchangeable with the visually similar 6L45 (MYA) valve body. Confirm your transmission's RPO code or send your VIN before ordering. The full 6L45/6L50/6L80/6L90 parts collection covers the rest of what we stock for this family.
Drop the pan and change the filter at the same time as the valve body swap so wear debris from the old unit doesn't circulate into the new one, torque the valve body bolts in the correct sequence, and refill with Dexron VI ATF only. Clear codes and run the TCM's adaptive relearn after the swap so clutch fill timing re-learns against the new unit rather than the old one's wear pattern. A 6L50 TCC solenoid is worth replacing alongside the valve body if your original complaint included converter shudder, and a shift kit for this platform addresses harsh-shift-only complaints without a full valve body swap.
| Fits | 6L50 |
| Part type | Valve Body |
| Condition | New |
| Brand | Sonnax |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It's the transmission electro-hydraulic control module mounted on the valve body. It reads internal pressure switches to confirm which range and clutch state was actually achieved, not just what was commanded, and uses that feedback for both gear selection and clutch-fill timing.
Could be either. Gears Magazine documented a Bosch capacitor issue in TEHCM units built between late July and late September 2017 that can trigger propulsion-related faults that look mechanical. Check your production date and stored codes before assuming it's the hydraulic section.
No. This platform's RPO codes carry different shift-solenoid and pressure-control-solenoid application charts, and the 6L50 (RPO MYB) valve body is not interchangeable with the 6L45 (RPO MYA) unit even though they look similar.
If it shares the GA6L45R-based 6L50 unit used across the 1, 3 and 5-Series applications on this GM/BMW platform, yes - confirm your transmission's RPO code or send your VIN before ordering.
Dexron VI ATF.
Yes - clear codes and run the TCM's adaptive relearn so the computer re-times clutch fill against the new valve body.
