Service Update 28770 4WD IPS Drift DTC C0398 – 4HI Lock-Up – 2015-2016 Cadillac Chevrolet GMC
NHTSA ID Number: 10130547 Manufacturer Communication Number: GCUS-3-804 Summary 28770 – SUB A “Service 4WD” message may be displayed on the Driver Information Center and DTC C0398 may be set. Concurrently, the vehicle is permanently locked in 4HI and cannot be shifted shift out of it while the code is present. If the code is cleared, … Read more