Code B449 - A/C-Heater High Side Temperature Too High

Code is designed to disengage A/C compressor clutch in event high side refrigerant temperature exceeds 199°F (93°C). The A/C compressor will come back on when high side temperature falls below 199°F (93°C).

With engine running and A/C on, enter BCM code BD27. Record temperature displayed during A/C operation.

If code was stored or current temperature exceeds 199°F (93°C) and A/C pressure exceeds 380 psi, possible causes for excessive high A/C head pressure must be checked.