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Home / DTC / C1940 — Transmitter BATT.voltage,Tire4

C1940 — Transmitter BATT.voltage,Tire4

Detailed page for trouble code C1940.

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Code

C1940

MITSUBISHI C — Chassis

Transmitter BATT.voltage,Tire4

Brand: MITSUBISHI
Type: C — Chassis
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Page language: EN

Causes

  • Aging or depleted lithium battery in the Tire 4 wheel sensor transmitter
  • Physically damaged or contaminated sensor (water intrusion, impact during tire service)
  • Incorrect or incompatible replacement sensor installed
  • Sensor not registered/learned to the TPMS control unit
  • Intermittent RF communication due to antenna/receiver fault or bad connector at the TPMS receiver/module
  • Sensor in sleep/inactive state after long storage or vehicle sitting

Symptoms

  • TPMS warning lamp or message illuminated on dash for Tire 4
  • No pressure/battery data shown for that wheel in a TPMS scan tool readout or low battery voltage value reported
  • Intermittent TPMS warnings or loss of signal from one wheel only
  • Tire pressure not being updated for that wheel during driving or relearn procedure

What to check

  • Use a compatible TPMS scan tool to read sensor ID, battery voltage, and last received signal for Tire 4
  • Verify TPMS fault code details and freeze frame data with a full OBD/TPMS scan
  • Visually inspect the wheel and valve stem sensor for physical damage or corrosion
  • Confirm correct sensor part number and frequency for the market (e.g., 315 MHz or 433 MHz) and that the sensor is programmed/learned to the vehicle
  • Check antenna/receiver connectors and wiring at the TPMS control module for corrosion, looseness or water ingress
  • Attempt to wake the sensor with a TPMS activation tool at the wheel and observe received data on the scan tool

Signal parameters

  • Typical TPMS RF frequency: 315 MHz (North America) or 433 MHz (some markets) — confirm correct frequency for vehicle
  • Nominal sensor battery voltage: ~3.0 V (CR2032/3V lithium cell or integrated cell)
  • Low battery threshold: battery voltage < ~2.5–2.7 V may trigger C1940 (manufacturer thresholds vary)
  • Reporting interval: once per drive or on wake; battery condition affects wake/report behavior
  • Data reported: sensor ID, tire pressure, temperature, battery voltage (if supported)

Diagnostic algorithm

  1. Scan vehicle with a TPMS-capable scan tool; record the fault, sensor ID for Tire 4, reported battery voltage and last communication time
  2. Visually inspect the wheel-mounted sensor/valve stem for damage, loose valve core, corrosion, or evidence of water intrusion
  3. Attempt to wake and read the Tire 4 sensor at the wheel with an RF activation tool; note whether the sensor responds and what battery voltage (if any) is reported
  4. If sensor reports low/no battery voltage or fails to respond, remove the tire from the wheel and inspect sensor more closely; replace the sensor if battery is confirmed low or sensor is damaged
  5. If a replacement sensor is installed, ensure it is the correct frequency/part and perform the required TPMS sensor learn/relearn procedure per manufacturer procedure
  6. If a known-good sensor responds at that wheel location, suspect TPMS receiver/antenna or module fault; inspect antenna/coax/connectors and the TPMS module for power/ground and communication errors
  7. After repairs or sensor replacement, clear codes, perform a complete TPMS relearn, and test drive to confirm the code does not return and the system receives pressure/battery data for Tire 4

Likely causes

  • Depleted sensor battery (most common)
  • Sensor damaged during recent tire removal/installation
  • Sensor not properly registered after replacement or tire rotation
  • Faulty TPMS receiver/antenna or poor electrical connection

Fault status

⚠️ Status
Transmitter battery voltage fault reported for Tire 4 — sensor battery low or no RF signal from Tire 4 transmitter.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

C1941 C1942 C1943
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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