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DTC codes / C00xx · Brakes, steering and suspension / C0077

C0077Low Tire Pressure

C0077 is a generic chassis code indicating that the vehicle's tire pressure monitoring system has detected one or more tires operating below the recommended inflation pressure. The computer compares wheel speed sensor signals or direct pressure sensor readings against calibrated thresholds and sets this code when a tire is significantly underinflated.

SystemChassis
Code typeGeneric (all makes)
SeverityLow
Fix difficultyDIY
AreaBrakes, steering and suspension

Symptoms you may notice

  • Tire pressure warning light illuminated on the dashboard
  • Often no symptoms besides the warning light
  • One tire visibly lower than the others when inspected
  • Slightly reduced fuel economy or handling response due to underinflation
  • Ride quality may feel softer or less stable, especially in corners
  • In severe cases, a vibration or pulling sensation if pressure loss is significant

Common causes, most likely first

  1. A tire with a slow puncture from a nail, screw, or road debris
  2. Leaking valve stem or valve core
  3. Damaged or corroded wheel bead seal causing gradual pressure loss
  4. Faulty tire pressure sensor with a weak battery or failed electronics
  5. Extreme temperature drop causing normal pressure reduction below the threshold
  6. TPMS system not reset or recalibrated after a tire rotation or replacement
  7. Cracked or damaged wheel rim allowing air to escape

How to diagnose and fix it

  1. Use a calibrated tire pressure gauge to check and record the pressure of all four tires, including the spare if equipped.
  2. Inflate any low tire to the manufacturer's recommended pressure found on the door jamb placard and recheck after a few hours.
  3. Inspect each tire for embedded objects, sidewall damage, and tread wear, then spray soapy water on the valve stem and bead area to look for bubbles.
  4. If a leak is found, have the tire professionally repaired or replaced, and replace a faulty valve stem or core as needed.
  5. Use an OBD-II scan tool to read and clear the C0077 code, then perform the manufacturer's TPMS relearn or reset procedure.
  6. If the warning returns without pressure loss, test each tire pressure sensor with a TPMS diagnostic tool to identify a failed sensor.
  7. Verify the repair by driving the vehicle at highway speed for several minutes and confirming the warning light stays off.

Why the light returns after inflating

  • A common oversight is inflating the tire but never clearing the code or performing the TPMS relearn, so the light stays on even though pressure is correct.
  • Temperature swings of more than 10 degrees Fahrenheit can drop tire pressure by about 1 PSI, which is enough to trigger C0077 on a borderline tire without any actual leak.
  • Some vehicles use indirect TPMS that calculates pressure from wheel speed sensors, so a dirty or failing wheel speed sensor can set C0077 even when every tire is properly inflated.
  • A tire pressure sensor with a weak battery can transmit intermittent or incorrect pressure data, causing a false low-pressure code that disappears after a battery-saving sleep cycle.
  • After a tire rotation, the TPMS system may not know which sensor is on which corner, and without a relearn procedure it can report the wrong tire as low or set a code for a tire that is actually fine.

Can I keep driving with C0077?

It is generally safe to drive with C0077 as long as the tire is not visibly flat and you stay below highway speeds, but inflate the tire to the correct pressure as soon as possible. Avoid high-speed driving and heavy loads until the pressure is corrected, because prolonged underinflation can overheat the tire and lead to a blowout.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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