Here are the most common reasons:
* Faulty ABS Wheel Speed Sensor: These sensors are located on each wheel and measure the wheel's speed. A malfunctioning sensor will provide incorrect data to the ABS module, causing it to activate the warning lights. This is the most frequent culprit.
* ABS Module Failure: The ABS module is the "brain" of the system. If it's faulty, it can't properly process the sensor data, leading to the warning lights. This is a more expensive repair.
* Low Brake Fluid: While less likely to trigger both lights simultaneously, critically low brake fluid can affect the ABS system and cause the lights to illuminate. Check your brake fluid level.
* Wiring Issues: Damaged or corroded wiring between the sensors, the ABS module, and the other components can cause intermittent or constant problems.
* Faulty ABS Pump Motor: The pump motor is part of the hydraulic system within the ABS module; failure can cause malfunctions.
* Power Issues: A faulty battery, alternator, or other electrical problems could affect the ABS system.
Troubleshooting Steps:
1. Check Brake Fluid: This is the easiest and quickest check. Low fluid could indicate a leak somewhere in the braking system.
2. Have the Codes Scanned: Use an OBD-II scanner (available at auto parts stores) to read the diagnostic trouble codes (DTCs). These codes will pinpoint the specific problem within the ABS system. A professional scan tool might be needed for more in-depth ABS diagnostics.
3. Inspect Wiring and Connectors: Look for any obvious damage to wiring harnesses, especially near the wheels where the speed sensors are located.
Without knowing the specific diagnostic trouble codes, it's impossible to give a definitive answer. A professional mechanic, preferably one experienced with Chryslers, should be consulted to diagnose and repair the problem. Attempting complex ABS repairs without the proper knowledge and tools can be dangerous.
