Q: Warning light still on

asked by on

I fixed my alternator, and I was checking voltage in the trunk near the battery. I unhooked a wire from battery to a distribution box by accident, and the car shut off. It was a 2ga wire. I put it back on, started the car and had a warning light on the dash saying that I had an engine malfunction and reduced power. I unhooked the battery for 20 minutes and the warning light was still on. Do you know what the problem is?

A: I am not sure that there is actually a prob...

I am not sure that there is actually a problem. The warning indicator that was produced by the vehicle was likely in reaction to the wire being unplugged from the power distribution box. When a trouble code is stored it will usually take multiple drive cycles or an OBD2 scanner to reset the light. I would recommend having the warning reset with an OBD2 scan tool and this should resolve your issue. If you are noticing any drivability issues, a certified technician from YourMechanic can diagnose your Warning Light and help pinpoint the fault.

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・Save up to 30%

Get a quote

What others are asking

Q: What does the Continuously Variable Transmission (CVT) Check warning light mean?

If your car has a Continuously Variable Transmission (CVT), there is a warning light in the dash designed to come on if a malfunction is detected. However, the light should come on briefly during the cranking process. It shouldn’t stay...

Q: How Do I Check the Voltage of My Car Battery?

You can get a general idea as to whether your battery is suspect by the voltmeter gauge in your car if it has one. These gauges are not too accurate as they are marked in wide increments and are really...

Q: Rough idling of engine with check engine light on

Hi there, thanks for writing in. The driver restraint fault code is a common issue on the BMWs. Here is how to clear it: Step 1: choose chassis "E65", then click on "Functional Jobs" Step 2: choose "Error" on the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.