OBD-II Fault Code

C1814: Air Suspension RR Vent Request Exceeded Max Timing

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for C1814.

System family

Chassis

Manufacturer-specific

Repair category

EVAP / fuel vapour

Use this category to narrow your checks before replacing parts.

Severity

Low

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

What C1814 usually means

Air Suspension RR Vent Request Exceeded Max Timing.

Common symptoms

ABS/traction/steering/suspension warning lamp or abnormal chassis behaviour; Fuel smell possible; Usually little drivability change

Likely causes

Loose/damaged fuel cap; Cracked EVAP hose; Faulty purge/vent valve; Leaking canister

Diagnostic checks

Inspect wheel/brake/suspension area, connectors, sensor wiring and module power/ground; Check fuel cap seal first; Smoke-test EVAP system; Command purge/vent valves with scan tool if available

Repair guidance

Replace damaged cap/hoses, repair leaks, replace stuck purge or vent valve after testing

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.