C0902 code meaning
TPMS Sensor 2 Battery
What C0902 means
C0902 cannot be traced in public sources; the NHTSA index only matches it inside an unrelated vehicle number. The title covers the cell feeding wheel transmitter 2. Which corner counts as number 2 is up to each maker; Mitsubishi numbers tires 1 to 4 and uses C1920 for a weak transmitter battery on tire 2. A CM Automotive patent shows how such a sensor watches itself: a resistor divider feeds the cell voltage to the microcontroller, every message carries a byte with that level, and the monitor lights a separate lamp once readings could become inaccurate. Honda splits the same fault by wheel, with codes 31, 33, 35 and 37. Because the cell is sealed into the transmitter, the fix is a new sensor plus ID learning.
C0902 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of C0902
- TPMS lamp or a service tire monitor message
- Readings from one wheel update less often or vanish
Common causes of C0902
- Most likelyTransmitter cell discharged after years of service
- Less likelySensor electronics drawing excess current, draining the cell early
- Less likelyAfter rotating wheels the battery warning is attributed to the wrong position
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Tpms sensorTpms control module
What each part of C0902 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 02 | The exact fault in that area. |
What to do next
- Note C0902 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 C0902
What does C0902 mean?
C0902 means "TPMS Sensor 2 Battery". C0902 cannot be traced in public sources; the NHTSA index only matches it inside an unrelated vehicle number. It is a generic code, so it means the same on every make.
Is it safe to drive with C0902?
C0902 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will C0902 fail an emissions test?
C0902 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 C0902 to fix?
Difficulty: medium. A typical repair takes 0.5 to 1.5 hours of work. This is a job for a workshop.
Will C0902 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.