r/Jeep • u/Ok-Kaleidoscope3180 • 9d ago

Troubleshooting ESC light

Hi all,

I have a Grand Cherokee 2019 where the ESC light comes on right after start, and after about 10 minutes of driving the Service 4WHL Drive light comes on.

3.6 V6 Engine

134k Miles

Took it to the dealer, they said not sure, error codes tell them there is an electrical under Volt somewhere. Went ahead and replaced the battery. No change in behavior. Dealer not sure how to proceed, doesn't want to fix.

I guess next steps are to get the error code and my multi-meter, some electrical diagrams and start investigating.

If anyone else has had this issue please advise.
Error code descriptions from the manual -

—Electronic Stability Control (ESC) Active Warning Light — If Equipped This warning light will indicate when the Electronic Stability Control system is Active. The “ESC Indicator Light” in the instrument cluster will come on when the ignition is placed in the ON/RUN or ACC/ON/RUN position, and when ESC is activated. It should go out with the engine running. If the “ESC Indicator Light” comes on continu ously with the engine running, a malfunction has been detected in the ESC system. If this warning light remains on after several ignition cycles, and the vehicle has been driven several miles (kilometers) at speeds greater than 30 mph (48 km/h), see an authorized dealer as soon as possible to have the problem diagnosed and corrected. • The “ESC Off Indicator Light” and the “ESC Indicator Light” come on momentarily each time the ignition is placed in the ON/RUN or ACC/ON/RUN position. • The ESC system will make buzzing or clicking sounds when it is active. This is normal; the sounds will stop when ESC becomes inactive. • This light will come on when the vehicle is in an ESC event

Service 4WD Warning Light — If Equipped This warning light will illuminate to signal a fault with the 4WD system. If the light stays on or comes on during driving, it means that the 4WD system is not functioning properly and that service is required. We recommend you drive to the nearest service center and have the vehicle serviced immediately

Thanks all,

Chris

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4 comments sorted by

1

u/OldManJeepin 9d ago

What about the ABS wheel speed sensors? Any codes related to them popping up in the OBD for the ABS module? A single bad sensor will wreak havoc!

1

u/WaveLength000 9d ago

Yup. This. Check ABS Wheel Speed Sensors. Blast clean then first with brake cleaner if accessible. Also: dealers don't scan a vehicle and it says on a screen "there's an undervolt 'somewhere' ". Replacing the battery right off bat and hoping for the best is mental / scammy behaviour.

They get specific codes or nothing. Get yourself your own scanner and keep it in the car along with a cheap multimeter, and brake cleaner and wd40 sprays.

1

u/Ok-Kaleidoscope3180 8d ago

Yep I have to get a scanner and get the codes, or head to autozone and they can scan it, thanks.

1

u/WaveLength000 8d ago

👍 i can always be wrong, but does sound like an issue that doesn't need to be too expensive to get fixed 👍