OBD-II Fault Code

C1902: Ride Control RR Shock Actuator Circuit Open

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for C1902.

System family

Chassis

Manufacturer-specific

Repair category

Suspension / ride control

Use this category to narrow your checks before replacing parts.

Severity

Medium

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What C1902 usually means

Ride Control RR Shock Actuator Circuit Open.

Common symptoms

ABS/traction/steering/suspension warning lamp or abnormal chassis behaviour

Likely causes

Height sensor fault; Air leak; Compressor/relay fault; Damaged wiring; Open circuit; Disconnected connector; Broken wire; Failed component

Diagnostic checks

Inspect wheel/brake/suspension area, connectors, sensor wiring and module power/ground; Inspect ride-height sensors, air lines, compressor relay/fuse and leaks; Check connector fitment and continuity from module to component

Repair guidance

Repair leaks/wiring, replace failed sensor/compressor/valve after testing; Repair open wire/connector or replace the failed component after continuity test

Verification after repair

Clear code, road-test safely at low speed first, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.