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P0623 is a diagnostic trouble code (DTC) for "Generator Lamp Control Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0623 trouble code is related to a vehicle’s engine control unit (ECU) and its connection with the battery’s voltage.
P0623 is an OBD-II generic code for a voltage problem between the ECU and the generator control module that helps a vehicle start properly.
There could be a variety of causes for a P0623, but the most common culprits are:
Symptoms can vary for a P0623, and some codes will have no impact on the vehicle. Other symptoms include:
Because a P0623 is mostly related to a vehicle’s battery and alternator, your mechanic will first test both to ensure voltage and output are within the manufacturer’s parameters. If they are not, either faulty part will be replaced. If they check out however, your mechanic will then ensure wiring and connectors are in good condition, replacing as necessary.
A good cleaning of battery terminals, wire connections and grounds can also help ensure an intermittent code does not return after it’s cleared.
Like any generic ECU control circuit code, the cause can difficult to find, so it’s important to start with the easiest first before replacement parts like an alternator, battery or ECU are bought. While this may not save time, it will save money.
A P0623 may cause a vehicle not to start or worse, charge while you’re out driving. How the vehicle drives with this code will determine how severe the problem is.
The most common repairs for a P0623 are as follows:
P0623s are not very common codes, but if you get one, chances are you’re driving a diesel. Because this code is mostly undocumented, chances are high it will coincidental to a different, more obvious issue, i.e. low battery voltage.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.