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P2501 is a diagnostic trouble code (DTC) for "Generator Lamp/L-Terminal Circuit High". 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.
The P2501 code is generic powertrain code related to vehicle speed controls and idle control system problems. In this case, the engine control module (ECM) has detected a fault with the generator lamp control circuit. In addition, the ECM may have been sent a high voltage reading from the battery, starting, or charging system.
Codes related to the P2501 include:
A code P2501 will be stored when the ECM has detected a high voltage reading from the L-Terminal circuit or a fault with the generator lamp.
The ECM monitors the starting and charging system when a vehicle’s key is turned to the “on” position/ The generator lamp circuit for the instrument panel is also monitored by the ECM at this point. The ECM anticipates approximately 14 volts from the charging system when the engine is on and no lights or accessories are in use. If the voltage is higher than around 14.4 volts, a P2501 code will be stored.
Several problems may cause a P2501 code including:
Symptoms of a P2501 code may include:
A mechanic may use several methods to diagnose a P2501 trouble code, including:
At times, a vehicle’s battery or starter may be incorrectly replaced when the actual problem is a damaged or defective alternator.
Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P2501 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P2501 trouble code and include:
There may be a technical service bulletin (TSB) associated with the P2501 code. It is recommended to check for any possible TSBs that may be associated with a trouble code prior to diagnosis and repair.
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