P0561 OBD-II Trouble Code: System Voltage Unstable

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Cost of diagnosing the P0561 code

P0561 is a diagnostic trouble code (DTC) for "System Voltage Unstable". 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
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check engine light

P0561 code definition

If the PCM detects an abnormal voltage reading from the battery, the charging system, or the starting system, it will store the P0561 code.

What the P0561 code means

Even when a vehicle is off, the battery supplies electricity to the ECM, which uses that power to store code histories, fuel trim values, and various other data. If the battery voltage falls below a specific level, the ECM assumes that there is a fault in the power supply circuit, and will alert the PCM to store the P0561 code.

What causes the P0561 code?

The P0561 code is most often caused by a dead or weakened battery. It may also be due to a defective battery, or one of the following causes:

What are the symptoms of the P0561 code?

Common symptoms of the P0561 code may include improper shifting, a decrease in fuel efficiency, engine stalling when idling, slow starting, and the illumination of the Check Engine Light. Low battery power may result in interior lights or other electrical components that don’t function properly.

How does a mechanic diagnose the P0561 code?

In order to properly diagnose the root cause of the P0561 code, a mechanic should first perform a visual inspection of the wiring, connectors, and battery cables, and replace or repair any that are faulty. After clearing the code, the mechanic should perform a retest of the system, to ensure that this simple repair did or did not solve the issue. If the mechanic successfully recreates the failure, and the code is stored in the PCM again, they may move on to other repairs.

Common mistakes when diagnosing the P0561 code

The most common mistake when diagnosing the P0561 code is a hyper-focus on the battery and starter, when the alternator is often a common problem with this code. It’s important to check if the alternator is properly charging, and that the vehicle’s charging system is operating correctly.

It is also important to be sure that the P0561 code is cleared from the PCM after every repair is performed, and the system is retested. With each clearance and retest, the mechanic will be able to get closer to the true cause of the problem.

How serious is the P0561 code?

If the P0561 code is stored in the PCM, it represents a potentially very serious issue that should be addressed as soon as possible. If the charging system, starter, and/or battery are not working properly, it is unlikely that the vehicle will be operational for very long. As soon as this code is detected, the issue should be diagnosed and repaired.

What repairs can fix the P0561 code?

Repairs that can be performed to fix the P0561 code include:

Need help with a P0561 code?

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.

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P0561

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Ben

38 years of experience
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Ben
38 years of experience
Answer all my question,solve the problem quickly excellent tech.And knew what was going on and would recommend him to a friend.
1996 VOLVO 850 - CHECK ENGINE LIGHT IS ON - HOUSTON, TEXAS

Joe

40 years of experience
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Joe was very thorough, professional and knowledgeable. I am extremely pleased with his service and will definitely recommend him to others.
2008 MAZDA 3 - CHECK ENGINE LIGHT IS ON - SAINT PETERSBURG, FLORIDA

Chris

13 years of experience
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Chris
13 years of experience
Chris came on time. He was unable to recharge our A/C because he proposed a set of preliminary tests for which he did not have the equipment to perform.
2003 FORD E-350 CLUB WAGON - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

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27 years of experience
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Clifton
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Clifton is wonderful. I really appreciate the time he spent showing me what was wrong with my car. He takes his time to make an accurate assessment and really goes above and beyond to fix things. I will definitely use Clifton again and highly recommend him as a mechanic.
2006 FORD ESCAPE - CHECK ENGINE LIGHT IS ON - DELRAY BEACH, FLORIDA

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