Code Definition

C1420 — Hydraulic Fluid Pressure/ Flow Circuit Short to Vbatt

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

About C1420

C1420 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 C1420 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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.

C1420 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

The C1420 fault code indicates the chassis control module has detected a short to battery voltage on the hydraulic fluid pressure or flow circuit. This circuit is typically associated with hydraulic suspension systems (Hydractive, Air Suspension hydraulic actuators), hydraulic power steering pressure feedback, or hybrid brake hydraulic systems where a pressure or flow sensor reports system status to the control module. The sensor uses a 0V to 5V analog signal proportional to hydraulic pressure or flow rate. This code sets when the module detects battery voltage on the signal circuit when the s...

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