Code Definition

C1117 — RPM Input Circuit Failure

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

About C1117

C1117 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1117 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

C1117 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

This chassis system code relates to the engine RPM signal that a control module such as the ABS or electronic brake control module relies on to coordinate its functions. C1117 sets when the module does not receive a valid engine RPM input, either because the signal is missing, out of range, or implausible compared with other inputs. The RPM signal is supplied either through a dedicated tachometer style wire from the PCM or shared across the vehicle data network, and the chassis module uses it to scale functions such as traction control intervention and brake assist timing. When this code is se...

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