Chassis, generic

C0902 TPMS Sensor 2 Battery

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Transmitter cell discharged after years of service
Sensor electronics drawing excess current, draining the cell early
After rotating wheels the battery warning is attributed to the wrong position

Symptoms

  • TPMS lamp or a service tire monitor message
  • Readings from one wheel update less often or vanish

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–200
Time0.5–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

tpms sensortpms control module

Related codes

C0900C0905C0907

References: mitsubishitechinfo.com, patents.google.com, ateq-tpms.com.