Chassis, generic

C0312 Ride Height Sensor Rear Right

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Searches for C0312 in reachable J2012 lists, in GM sources and in the NHTSA bulletin index returned nothing, so only the component is described here. A ride height sensor at the right rear converts the swing of a lever arm linked to the suspension into an electrical signal, usually by inductive or Hall measurement, and feeds air suspension, damping or headlamp levelling. HELLA lists bent lever arms, broken wires, corroded plugs and water ingress as the usual failures. Makers use their own numbers here: RAM stores a stuck right rear height sensor on the 2022–23 1500 as C152A-2A and fixed it with module software, and BMW had to inspect rear sensor control rods on 2019 X5 and X7 models.

Likely causes

Bent, detached or wrongly clipped sensor lever or link rod
Corroded connector or broken wire at the rear right sensor
Sensor failed internally after water ingress

Symptoms

  • Air suspension or levelling warning message
  • Rear right corner sits too high or too low
  • Headlamp levelling incorrect

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–400
Time0.5–2 h

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

Parts involved

height sensor rrair suspension modulesensor linkage

Related codes

C0301C0317

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