CADILLAC, CHEVROLET, GMC · 2025-06-11
This P/I advises to replace the valve body, not the TCM, for DTCs P1787, P27EC, P187E and/or P18A1 on vehicles equipped with an ETRS trans assembly.
P18A1 · Manufacturer communications
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
P18A1 ← What does this code mean?1 Results