Chassis, generic

C051E Multi-axis Acceleration Sensor Module A Intermittent/Erratic

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

Module A's data arrive, but values jump, freeze briefly or vanish for short moments instead of changing smoothly. Modern units digitise yaw rate and accelerations inside the module and pass them on over a serial link: Bosch's SMI810 uses SafeSPI with 16-bit data, and a Hyundai/Kia design checks each value against the sensor's measuring range before sending it over CAN to the stability controller. Loose plugs, vibration or supply dips can therefore show up as erratic samples. No manufacturer publishes C051E, so limits are unknown. The intermittent label separates it from a steady implausible value (C051C) and from a disagreement with other signals (C051F). The ESC lamp may come and go between drives.

Likely causes

Loose or corroded connector at module A

Brief supply or ground dropouts, weak battery

Module not firmly fastened, picks up vibration

Sporadic internal fault of the sensor electronics

Symptoms

ESC warning lamp comes and goes
Stability control occasionally unavailable
Jumping yaw or acceleration values in live data

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€60–900

Time0.5–3 h

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

Parts involved

multi axis accel module a

Related codes

C051C C051D C051F C0520 C0523

References: bosch-semiconductors.com, patents.google.com, bosch-mobility.com.