Fault Family
System: Chassis (C-Codes)
3 SAE Codes
TPMS Related Fault
Diagnostic & Technical Explanation
Code C0077 (Low Tire Pressure) sets when the chassis/ABS module -- which uses tire pressure and rolling diameter data to correct wheel speed calculations and detect a significantly under-inflated tire -- detects a persistent low-pressure condition, an uncorrected tire diameter mismatch, or the TPMS malfunction lamp is commanded on by an upstream fault. A genuinely low tire, a mismatched replacement tire size, or an unresolved TPMS sensor fault feeding bad data into the chassis module are the common causes; this is rarely a chassis-module hardware failure by itself. Because mismatched rolling diameters distort wheel speed comparisons, this fault can also trigger unrelated ABS/traction codes until it is resolved.
These 3 diagnostic trouble codes share one
detection mechanism and one repair path, which is why MechanicDB groups them into a single
authored fault family rather than repeating the same explanation 3 times.
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)