C0820 code meaning
Air Suspension Height Sensor Front Left
What C0820 means
Nobody documents C0820 in the open; apart from Honda bulletin IDs that happen to contain the string, searches of lists and indexes found nothing. The title concerns the ride height sensor at the left front corner, a lever on the control arm turning an angle sensor that reports body height to the air suspension module. Stellantis uses its own numbers here: C151E for a stuck left front sensor on the 2022-23 Ram 1500, fixed by new module software (08-127-23, 08-150-24), and C1567 for an implausible left front level on the 2021 Grand Cherokee, where pinched front air lines were the cause. Without a valid front left height, the module stops levelling that corner or the whole car and shows a service message.
C0820 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0820
- Service air suspension message
- Front left corner sits too high or too low, height changes refused
Common causes of C0820
- Most likelyBent, detached or seized sensor lever or link at the front left control arm
- PossibleWater, corrosion or chafing at the sensor plug or harness in the wheel arch
- Less likelyAir suspension module software reporting a false stuck sensor (Stellantis 08-150-24)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Height sensor flAir suspension moduleSensor wiring
What each part of C0820 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 20 | The exact fault in that area. |
What to do next
- Note C0820 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 C0820
What does C0820 mean?
C0820 means "Air Suspension Height Sensor Front Left". Nobody documents C0820 in the open; apart from Honda bulletin IDs that happen to contain the string, searches of lists and indexes found nothing. It is a generic code, so it means the same on every make.
Is it safe to drive with C0820?
Drive gently and only to a workshop. With C0820 the car can go into limp mode (reduced power) to protect itself.
Will C0820 fail an emissions test?
C0820 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 C0820 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will C0820 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.