DTC B337: Loss Of HVAC Programmer Data: Description

Code B337 will set if the ignition is on and the BCM is not able to exchange data with the HVAC programmer. The fault could be due to a loss of 12 volts power or ground to the programmer or a double open in the programmer data line, one on each side of the component. When this codes is set, the A/C clutch will be disabled and the blower runs at a constant 6 volts.