C0077 code meaning
Low Tire Pressure
What C0077 means
Covers a low-tire-pressure indication reaching the ABS/ESC or body module, typically from an indirect tire-pressure monitoring system that infers pressure from wheel behaviour rather than from in-tire sensors. An under-inflated tire has a smaller rolling radius and turns faster, and its vibration spectrum shifts; the system detects this from the ABS wheel speed signals and raises a low-pressure warning. Honda documents VSA code C0077-78, which refines the warning threshold for low tire pressure, where the indicator stays on although the tires are correctly inflated, calling for a TPMS software update; Volvo documents BCM-C007768 on indirect-TPMS vehicles. A set code warns the driver and may require a reset after correct inflation. Indirect TPMS patents describe the wheel-speed and resonance methods used.
C0077 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0077
- Low tire pressure indicator on
- Warning despite correct pressure
- Requires reset after inflation
Common causes of C0077
- Most likelyOne or more tires under-inflated
- PossibleSystem not reset after inflation
- Less likelyTPMS threshold/software issue
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Tires
What each part of C0077 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 77 | The exact fault in that area. |
What to do next
- Note C0077 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 C0077
What does C0077 mean?
C0077 means "Low Tire Pressure". Covers a low-tire-pressure indication reaching the ABS/ESC or body module, typically from an indirect tire-pressure monitoring system that infers pressure from wheel behaviour rather than from in-tire sensors. It is a generic code, so it means the same on every make.
Is it safe to drive with C0077?
C0077 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will C0077 fail an emissions test?
C0077 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 C0077 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0077 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.