C0499 code meaning
Lateral Acceleration Sensor Range/Performance
What C0499 means
C0499 is missing from the accessible J2012 lists. GM bulletin PIP5094 names C0499 next to C0498 without saying what it stands for, so no manufacturer confirms a lateral acceleration meaning; the established code with this title is C0185. The title describes a lateral acceleration reading that is wired correctly but implausible. Saab explains that its ESP unit compares measured lateral acceleration with what the steering angle implies. A Ford patent derives a road-bank angle from lateral acceleration and steering angle, accepts an accelerometer fault only while the car is stable, then disables brake control until the next key-on and warns the driver. The ZF thesis from Linköping detected offset and drift faults of this sensor with model residuals.
C0499 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of C0499
- ESC lamp on, stability control switched off until restart
- Unexpected ESC interventions on banked roads
Common causes of C0499
- Most likelyOffset or drift of the lateral acceleration sensor
- PossibleSensor cluster loose or not mounted level
- Less likelySteering angle reference not calibrated
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lateral acceleration sensorYaw rate sensorABS control module
What each part of C0499 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 99 | The exact fault in that area. |
What to do next
- Note C0499 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 C0499
What does C0499 mean?
C0499 means "Lateral Acceleration Sensor Range/Performance". C0499 is missing from the accessible J2012 lists. It is a generic code, so it means the same on every make.
Is it safe to drive with C0499?
Drive gently and only to a workshop. With C0499 the car can go into limp mode (reduced power) to protect itself.
Will C0499 fail an emissions test?
C0499 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 C0499 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will C0499 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.