Code Definition

C1779 — Blower Switch Failure

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Ford

About C1779

C1779 is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1779 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1779 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC C1779 indicates that a failure has been detected in the blower switch circuit. The blower switch provides the control module with the driver's requested fan speed, and on Ford hybrid applications cabin airflow also supports hybrid battery cooling, which is why this input is monitored as part of the chassis system rather than treated purely as a comfort item. The code sets when the switch input reads open, shorted, or reports an implausible combination of positions. When this code is set, the blower may work only on some speeds, run continuously, or not respond at all, and on hybrid models ...

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