Skip the auto shop - Our mechanics make house calls

Q: Electrical power drops out completely while driving.

asked by on

2003 Jeep Grand Cherokee Laredo 4.0L 305,000+ miles. On startup in the morning, when I put the car in drive and stepped on the gas, electrical power would sometimes drop out completely, then comes back, then does it again sometimes 5 or 6 times (i.e., RPM's go to zero, gas gauge goes to empty, speedometer goes to zero, engine stops running, etc.). Wiggling the key always resolved the problem but sometimes it took several tries (and sometimes a couple of restarts) to find a "sweet spot". After it resolved it ran fine, but once in a great while it skipped a beat again. Throughout the day when I started it the same thing would happen, but not as bad. I have replaced the ignition switch with a new one from Standard Electrical Product. It greatly improved the situation, but sometimes it still happens. Question is, short of having gotten a defective ignition switch off-the-shelf, is there anything else that might cause this? (Bad relay somewhere, etc.) Thanks.

My car has 305000 miles.
My car has an automatic transmission.

A: A faulted automatic shutdown relay or asd r...

A faulted automatic shutdown relay or asd relay is a common concern on your vehicle model and can show the same symptoms. I have seen this problem caused by the relay as well as corrosion inside the under hood fuse block so that would be a good place to start looking around. Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at your loss of power or stalling concerns and offer a more personal diagnosis.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: 97 Jeep grand Cherokee lerado stalling/shutting off

It sounds like you may have more than one issue with the vehicle. The crankshaft sensor is the most common cause of the stalling or no start on these engines. They will also cause problems when you try to increase...

Q: Cooling

You may just have a cap that is leaking pressure. Coolant systems are designed to work under pressure, and if the coolant overflow bottle is leaking or the cap is not holding pressure, then it will release coolant. The most...

Q: Engine turns over but won't start. Could it be a sensor and how do I check?

Hi there. There is a possibility that no power is being supplied from the ignition switch to the power distribution center fuse. The ASD relay fuse may have blown on the ground "control" side of ASD relay. Circuit tests need...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.