However, "seeing 4WD lit" isn't inherently a problem that needs fixing. It's an indicator. The *real* problem might be *why* the light is on, or if it's on *incorrectly*.
Possible Scenarios and Troubleshooting:
1. 4WD is engaged correctly: If you've intentionally shifted into 4WD and the light is on, everything is likely fine. Just remember to shift back to 2WD (2-wheel drive) on dry pavement. Driving in 4WD on dry pavement can cause drivetrain stress and reduced fuel efficiency.
2. 4WD light is on incorrectly (stuck on): This means the system *thinks* it's in 4WD, even if it's not. This could be due to:
* Faulty transfer case shift motor: This is a common culprit. The motor controls the engagement of the 4WD system. It might be malfunctioning, jammed, or have a broken electrical connection. This requires professional diagnosis and likely replacement.
* Faulty transfer case sensor (neutral position sensor/switch): This sensor tells the computer the position of the transfer case. A bad sensor can cause the 4WD light to illuminate incorrectly. Again, professional diagnosis is needed.
* Electrical problems: Issues with wiring, connectors, or the transfer case control module (TCM) can cause incorrect light illumination. A mechanic will need to trace these.
* Low fluid: While less likely to cause a constantly lit indicator, low transfer case fluid can cause problems leading to incorrect signals. Check your fluid level ( consult your owner's manual).
3. 4WD light is intermittently on/off: This could point to more intermittent electrical issues or a sensor problem.
What NOT to do:
* Don't attempt major repairs yourself unless you have significant mechanical experience with Jeep transfer cases. These systems are complex, and incorrect repair can cause severe damage.
What TO do:
1. Consult your owner's manual: It should have a section on the 4WD system, including troubleshooting guides and diagrams.
2. Have a mechanic diagnose the problem: A qualified mechanic with experience in Jeep Grand Cherokees can accurately determine the cause of the issue and perform the necessary repairs. Mention the specific behavior of the "4WD" light (constantly on, intermittent, etc.) to help them diagnose it effectively.
In short, the "Four Wheel Drive" light itself isn't the problem; it's a symptom. You need professional help to diagnose the underlying cause.
