Chassis, generic

C0821 Air Suspension Height Sensor Front Right

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

C0821 leaves no public trace in public lists, bulletins or maker indexes; going by its name it means the front right level sensor. HELLA builds such sensors as a housing on the body with a lever and ball joint to the axle, using potentiometer, Hall or contactless inductive elements, fed with 4 to 11 V and sending analogue, PWM, SENT or PSI5 signals. Stellantis logs the front right sensor as C1522: subcode 11, a grounded signal wire, on the 2022 Grand Wagoneer, where its STAR case notes the code can also appear after the car was jacked up or lifted, and subcode 2A for a stuck signal on the 2022-23 Ram 1500. A ground fault often hides in a wet or damaged connector at the wheel arch.

Likely causes

Signal wire shorted to ground by chafing, water or corrosion

Code stored after the car was jacked or lifted, sensor at end of travel

Front right height sensor or its lever defective

Symptoms

Service air suspension message
Vehicle leans to the front right or levelling is switched off

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€60–450

Time0.4–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

height sensor frair suspension modulesensor wiring

Related codes

C0820 C0822 C0823

References: hella.com, static.nhtsa.gov, static.nhtsa.gov.