C051F code meaning
Multi-axis Acceleration Sensor Module A Correlation
What C051F means
The brake controller finds that module A's signals do not agree with a second source of the same motion. Audi uses this code on the e-tron: the ABS unit (address 0003) stores C051F00, and Audi's 2019 bulletin names the suspension control module as sensor module A. Waking the bus while the car falls asleep could set it, along with implausible lateral acceleration and yaw codes and a lost airbag-unit message; often an ignition cycle clears it, otherwise a drive above about 30 mph with the wheel turned 60 degrees each way. Bulletin 2061908 (2019 to 2024 e-tron and Q8 e-tron) logs it sporadically and fixes it with new ABS and suspension software. Bosch patents cross-check redundant inertial sensors the same way.
C051F at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of C051F
- ESC warning lamp and several cluster messages
- Yellow drive fault message (Audi e-tron)
- Fault often gone after the next ignition cycle
Common causes of C051F
- Most likelyABS or suspension control software fault (Audi e-tron update)
- PossibleBus woken while modules enter sleep mode (door, charger)
- Less likelyModule A misaligned so its axes no longer match the reference
- Less likelyFault in the comparison source (second inertial sensor, steering angle, wheel speeds)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Multi axis accel module aSuspension control module
What each part of C051F means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1F | The exact fault in that area. |
What to do next
- Note C051F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C051F
What does C051F mean?
C051F means "Multi-axis Acceleration Sensor Module A Correlation". The brake controller finds that module A's signals do not agree with a second source of the same motion. It is a generic code, so it means the same on every make.
Is it safe to drive with C051F?
Drive gently and only to a workshop. With C051F the car can go into limp mode (reduced power) to protect itself.
Will C051F fail an emissions test?
C051F is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C051F to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. This is a job for a workshop.
Will C051F clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.