Faulty inlet valve solenoid on the rear right air strut or valve block; Damaged or corroded electrical connector or wiring to the valve; Blockage or restriction in the air line to the rear right strut; Failed height sensor or ride height sensor at the rear right corner; Control module software glitch or internal fault in the suspension control unit; Air leak at the valve or strut causing performance issues

DTC codes / C03xx · Brakes, steering and suspension / C0307

C0307Inlet Valve Rear Right Performance

Q: What does code C0307 mean?

Inlet Valve Rear Right Performance. The code C0307 indicates that the vehicle's control module has detected a performance issue with the inlet valve on the rear right corner of the vehicle, typically part of an air suspension or adaptive damping system. The computer monitors valve response and timing, and when the expected behavior is not observed, it stores this code and may illuminate a warning light.

The code C0307 indicates that the vehicle's control module has detected a performance issue with the inlet valve on the rear right corner of the vehicle, typically part of an air suspension or adaptive damping system. The computer monitors valve response and timing, and when the expected behavior is not observed, it stores this code and may illuminate a warning light.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

Illumination of the suspension or chassis warning light on the dashboard
Often no symptoms besides the warning light, especially in early stages
Uneven ride height or the rear right corner sitting lower than the others
Compressor running longer than usual or cycling frequently
Reduced ride comfort or handling responsiveness
In some cases, a message on the driver information display indicating suspension fault

Common causes, most likely first

Faulty inlet valve solenoid on the rear right air strut or valve block
Damaged or corroded electrical connector or wiring to the valve
Blockage or restriction in the air line to the rear right strut
Failed height sensor or ride height sensor at the rear right corner
Control module software glitch or internal fault in the suspension control unit
Air leak at the valve or strut causing performance issues

How to diagnose and fix it

Use a scan tool to read all suspension codes and live data to confirm the fault and check valve operation
Inspect the wiring and connector at the rear right inlet valve for damage, corrosion, or loose pins
Check the air line for kinks, leaks, or blockages between the valve block and the strut
Test the valve solenoid with a multimeter for resistance and compare to specification
Perform a ride height calibration or system relearn if no hardware faults are found
Replace the faulty inlet valve or valve block if testing indicates failure
Clear codes and verify the repair with a test drive and recheck for pending codes

Common misdiagnosis traps for C0307

A weak battery or low voltage can cause erratic valve operation and set this code without any defective component, so always check charging system health first.
The inlet valve performance can be affected by a failing compressor that cannot supply enough pressure, leading to a false valve code.
Corrosion inside the valve block connector is a frequent hidden cause, especially in regions with road salt, and is often overlooked during visual inspection.
After replacing a valve or strut, the system may require a relearn or calibration procedure; skipping this step can cause the code to return immediately.
This code can be set by a software issue in the control module, and a software update may resolve it without any parts replacement.

Can I keep driving with C0307?

It is generally safe to continue driving with this code, but avoid aggressive cornering or heavy loads until repaired, as the suspension may not perform optimally. If the vehicle is sitting noticeably low or the compressor runs constantly, seek repair soon to prevent further damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.