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What Causes the Gear Indicator Light in an Automatic Transmission to Not Illuminate?

1 Answers

LaAyla

07/29/25 3:48pm

Reasons why the gear indicator light in an automatic transmission does not illuminate: 1. Faulty gear position switch; 2. PCM (Powertrain Control Module) malfunction; 3. Internal transmission failure; 4. Damaged gear indicator light module. If the gear display in an automatic transmission is abnormal, check whether the gear position switch has a short circuit or open circuit, or if it has been exposed to water. You can connect a diagnostic computer to determine whether it is an electronic fault with the gear position switch or an electrical fault with the instrument display. Replace any damaged components as needed. The gears in an automatic transmission include P, R, N, D, S, and L, representing Park, Reverse, Neutral, Drive, Sport mode, and Low gear, respectively. A faulty gear position switch may fail to display the correct gear indicator, and in severe cases, it can lead to gear shifting confusion, inability to shift gears, resulting in insufficient vehicle power and affecting the transmission's lifespan.

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