Code Definition

C1122 — Engine Speed Signal Circuit Malfunction

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

About C1122

C1122 is a manufacturer-specific chassis diagnostic trouble code recorded for Suzuki vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1122 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.

C1122 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

C1122 is set on Suzuki models when a chassis control module, typically the power steering control module or the ABS control module, fails to receive a valid engine speed signal. Engine speed is broadcast by the ECM and is used to confirm the engine is actually running before electric power steering assist is enabled and before ABS and traction functions are permitted to operate. When that signal is absent, intermittent or implausible, the receiving module treats the engine as stopped and shuts its function down, so the driver reports heavy or dead steering, a power steering or ABS warning lamp...

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