Code U0038 indicates that the vehicle's communication network (Bus B) is experiencing performance issues. This means that while the network is functioning, the data being transmitted is intermittent, delayed, or corrupted.
Chafed, pinched, or corroded wires on the CAN Bus B network causing signal interference.
A malfunctioning module connected to Bus B sending 'noise' or invalid data onto the network.
Moisture or oxidation at connector pins increasing resistance and disrupting signal integrity.
A failing battery or alternator causing modules to operate below the required voltage threshold.
Internal hardware failure within the PCM or ECM disrupting network management.
Rarely. While the PCM is part of the network, U0038 is most often caused by wiring faults or a failing peripheral module rather than the PCM itself.
Yes, poor grounding can create electrical noise that interferes with the high-speed data signals on the communication bus.
It depends on which systems are affected; if critical safety systems like ABS or airbags are malfunctioning, the vehicle may be unsafe.