Code Definition

C1931 — Air Suspension Front Compressor Relay Circuit Short To Battery

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

About C1931

C1931 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 C1931 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

C1931 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 air suspension system uses an electric compressor, energized through a relay commanded by the air suspension control module, to maintain vehicle ride height. DTC C1931 is set when the control module detects the front compressor relay control circuit shorted to battery voltage, meaning unintended voltage is present on the relay coil control circuit. This abnormal voltage can keep the relay energized or prevent proper control and may risk damage to the module output driver. When this code is set, the compressor may run continuously or fail to respond to commands, ride height control may be e...

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