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DTC codes / C09xx · Brakes, steering and suspension / C0907

C0907TPMS Sensor 4 Battery Low

C0907 indicates that the tire pressure monitoring system (TPMS) has detected a low battery condition in the sensor mounted in one specific wheel, typically sensor number 4 in the system's addressing scheme. The computer has not lost communication with the sensor; it has determined that the sensor's internal battery is nearing the end of its service life and may soon stop transmitting pressure data reliably.

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

Symptoms you may notice

  • Tire pressure warning light illuminated on the dashboard, often flashing briefly at startup before staying on solid.
  • A message on the driver information display indicating a TPMS sensor fault or low sensor battery.
  • Intermittent loss of pressure readings for one wheel on the TPMS display, if the vehicle shows individual tire pressures.
  • No other drivability symptoms, since the sensor battery issue does not affect engine, transmission, or braking performance.
  • Often no symptoms besides the warning light, especially on vehicles that do not display individual tire pressures.
  • The warning may clear temporarily after a short drive and return later as the battery voltage fluctuates with temperature.

Common causes, most likely first

  1. The battery inside the wheel-mounted TPMS sensor has reached the end of its normal service life, which is the most common cause.
  2. Cold ambient temperatures temporarily reduce the sensor battery's output voltage enough to trigger the low-battery threshold.
  3. A failing sensor electronics board that draws excessive current and drains the battery prematurely.
  4. Water or contaminant intrusion into the sensor housing causing internal corrosion and battery degradation.
  5. Physical damage to the sensor from road debris, tire mounting, or impact that compromises the battery connection.
  6. A sensor that has been in service far longer than the typical five-to-ten-year lifespan and is simply due for replacement.

How to diagnose and fix it

  1. Verify the code with a TPMS-capable scan tool and confirm which wheel position the system identifies as sensor 4, since the numbering does not always match a simple clockwise order.
  2. Check and adjust all tire pressures to the placard specification, then perform a TPMS relearn procedure to see if the code returns after a short test drive.
  3. Use a TPMS activation tool to read the sensor's battery status and signal strength directly at each wheel, confirming the low-battery condition before condemning the sensor.
  4. Inspect the suspect sensor and valve stem for corrosion, cracks, or physical damage that could explain a premature battery failure.
  5. Replace the faulty sensor with a correct-frequency replacement, then program or relearn it to the vehicle following the manufacturer's procedure.
  6. Clear the code and complete a road test at highway speed to confirm the new sensor reports stable pressure and the warning light stays off.
  7. If the code persists after sensor replacement, inspect the TPMS receiver or antenna wiring for intermittent faults that could mimic a low-battery signal.

What a TPMS low-battery code really means

  • A low-battery code does not mean the sensor has failed completely; it often continues to transmit pressure data for weeks or months before dropping out entirely, so the warning is a service reminder rather than an immediate safety failure.
  • Cold weather is a common trigger because a battery that is marginal at room temperature can dip below the threshold on a freezing morning, which is why the light sometimes appears only in winter and clears in spring.
  • Many vehicles do not display individual tire pressures, so a low-battery sensor can go unnoticed until the warning light appears, and technicians who skip a direct sensor activation test may misdiagnose the code as a receiver or wiring fault.
  • Aftermarket sensors and universal programmable sensors can set low-battery codes prematurely if they are not the correct type or are improperly programmed, so matching the sensor to the vehicle's TPMS protocol is critical.
  • The sensor numbering in the code does not always correspond to a simple left-front, right-front, left-rear, right-rear order; always confirm the position with a scan tool or activation tool before replacing parts.

Can I keep driving with C0907?

The vehicle remains safe to drive because the tire pressure monitoring system is an informational aid and the low sensor battery does not affect braking, steering, or engine operation. However, you should not ignore the warning indefinitely, because once the sensor battery fails completely you will lose tire pressure monitoring for that wheel and may not be alerted to a slow leak or underinflation.

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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