Weak or dead sensor battery; Damaged or faulty TPMS sensor at position 2; Corrosion or poor connection at the sensor valve stem; Radio frequency interference from aftermarket electronics; Sensor not properly initialized or registered after rotation; Wheel-mounted sensor physically damaged by road debris or tire service; TPMS module software glitch or outdated calibration

DTC codes / C09xx · Brakes, steering and suspension / C0903

C0903TPMS Sensor 2 Position Performance

Q: What does code C0903 mean?

TPMS Sensor 2 Position Performance. C0903 indicates that the tire pressure monitoring system (TPMS) has detected a performance problem with the sensor assigned to position 2, typically the front right or a manufacturer-defined second wheel location. The computer monitors the sensor's signal quality and response time, and it sets this code when the sensor's output is erratic, intermittent, or outside expected parameters for its position.

C0903 indicates that the tire pressure monitoring system (TPMS) has detected a performance problem with the sensor assigned to position 2, typically the front right or a manufacturer-defined second wheel location. The computer monitors the sensor's signal quality and response time, and it sets this code when the sensor's output is erratic, intermittent, or outside expected parameters for its position.

SystemChassis

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

TPMS warning light illuminated steadily or flashing
Often no symptoms besides the warning light
Incorrect tire pressure readings on the dashboard display
Intermittent loss of one tire's pressure reading
False low-pressure warnings despite correct inflation
Other TPMS-related codes stored in the module

Common causes, most likely first

Weak or dead sensor battery
Damaged or faulty TPMS sensor at position 2
Corrosion or poor connection at the sensor valve stem
Radio frequency interference from aftermarket electronics
Sensor not properly initialized or registered after rotation
Wheel-mounted sensor physically damaged by road debris or tire service
TPMS module software glitch or outdated calibration

How to diagnose and fix it

Verify tire pressures with a accurate gauge and adjust to specification
Perform a TPMS relearn procedure using a scan tool or manufacturer method
Inspect the sensor at position 2 for physical damage or corrosion
Test sensor signal strength and battery life with a TPMS diagnostic tool
Replace the faulty sensor and perform initialization
Check for aftermarket electronic interference and relocate devices if needed
Update TPMS module software if a known calibration issue exists

Why position 2 may not be the front right

Position 2 is not standardized across all manufacturers; it can refer to any wheel depending on the vehicle's TPMS assignment order, so always consult the service manual for the correct location.
A sensor that passes a static test can still fail intermittently due to a weak battery that only drops out under temperature extremes or centrifugal force while driving.
Aftermarket LED lights, phone chargers, or dash cameras can emit radio frequency interference that disrupts TPMS signals and triggers performance codes without any sensor fault.
The code can set after a tire rotation if the sensors were not relearned to their new positions, causing the module to see unexpected signal patterns.
Some vehicles require a specific driving pattern to complete TPMS self-calibration after service, and skipping this step can leave a stored C0903 even with good sensors.

Can I keep driving with C0903?

It is generally safe to continue driving with C0903 because the base tire pressure monitoring function may still work, but you should avoid ignoring the warning light and check tire pressures manually until the fault is repaired. Do not rely on the TPMS display for accurate pressure readings, and address the issue promptly to maintain full safety system functionality.

Tools that help

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