ASE A4 Suspension and SteeringWheels and Tires Diagnosis and RepairMedium
A technician is performing a tire pressure monitoring system (TPMS) relearn procedure after replacing a tire. After following the manufacturer's steps, the TPMS light remains on and no sensor data is displayed. Which of the following is the MOST likely reason for this failure?
- AThe vehicle was not driven at a consistent speed for a long enough duration.
- BThe new tire was not properly balanced.
- CThe TPMS sensor battery has failed or the sensor is faulty.
- DThe wheel lug nuts were not torqued to specification.
Show answer & explanationAnswer & explanation
Correct answer: C. The TPMS sensor battery has failed or the sensor is faulty.
If the TPMS light remains on and no sensor data is displayed after attempting a relearn procedure, it strongly suggests that the sensor itself is not functioning, most commonly due to a dead battery or internal fault.
Why the other options are wrong
- A. While driving is often part of a relearn, if no data is displayed at all, the issue is more fundamental than just incomplete driving.
- B. Improper tire balancing would cause a vibration, not a TPMS light or lack of sensor data.
- D. Incorrect lug nut torque would affect wheel retention and potentially cause vibration, but not TPMS sensor data transmission.
TPMS Sensor Failure
TPMS sensor failure, often due to a dead battery or internal defect, prevents the sensor from transmitting tire pressure data, causing the TPMS warning light to illuminate and diagnostic tools to show no sensor data.
- Commonly caused by dead sensor battery
- Can be due to physical damage or internal fault
- Results in TPMS light on and no pressure readings
- Requires sensor replacement and relearn
Memory trick: No signal, no sense, no battery, no chance!