Code Definition

C1774 — Coolant Temp Out of Range

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

About C1774

C1774 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 C1774 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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.

C1774 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 C1774 is a manufacturer specific chassis code defined as Coolant Temperature Out of Range, and it appears in the Ford master chassis code list as well as in several other manufacturer code sets with the same definition. Unlike a powertrain coolant code, C1774 is logged by a chassis control module, typically the ABS or traction control module, which receives the engine coolant temperature value from the PCM over the vehicle data network and uses it in its control and protection strategies. The code sets when the received coolant temperature value is outside the plausible operating range, wh...

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