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What makes the Transmission Light come on a 1999 Cadillac Catera?

The transmission light (often a gear or an exclamation point inside a gear) on a 1999 Cadillac Catera, like most cars, illuminates to indicate a problem with the automatic transmission. The exact cause can vary, but some common culprits include:

* Low Transmission Fluid: This is the most common and often easiest to fix. Check your transmission fluid level (using the dipstick if equipped; some models require a scan tool). Low fluid can lead to overheating and damage. If low, add the correct type of transmission fluid (consult your owner's manual). If the level is consistently low, there might be a leak that needs attention.

* Faulty Transmission Fluid Temperature Sensor: This sensor monitors the transmission fluid's temperature. A malfunctioning sensor can send inaccurate readings, triggering the light.

* Solenoid Problems: The transmission uses solenoids to control fluid flow. A faulty solenoid can prevent proper shifting and illuminate the light.

* Torque Converter Issues: The torque converter is a vital component linking the engine to the transmission. Problems with it can cause shifting issues and illuminate the light.

* Transmission Valve Body Problems: The valve body controls the operation of the solenoids and other internal components. Internal wear or damage can cause malfunctions.

* Wiring Issues: A short circuit, broken wire, or a faulty connector in the transmission's wiring harness can cause the light to come on.

* Failing Transmission: In the worst-case scenario, the transmission itself might be failing due to wear, internal damage, or lack of maintenance.

What to Do:

1. Check the transmission fluid level and condition: This is the first and most important step. If the fluid is low or dirty/burnt, address that issue immediately.

2. Have the car scanned for diagnostic trouble codes (DTCs): A mechanic can use an OBD-II scanner to read the codes stored by the car's computer. These codes will pinpoint the likely source of the problem.

3. Don't ignore the light: Continuing to drive with a malfunctioning transmission can cause significant and expensive damage.

Ignoring the transmission light could lead to expensive repairs or even transmission failure. It's always best to have a qualified mechanic diagnose the issue and recommend the necessary repairs.

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