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What is the meaning of system voltage low and can this be fixed and how much will it cost? Thanks

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Voltage low (when engine is off) means problems with the battery. Try to recharge the battery with dedicate charger.

Posted on Dec 01, 2014

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It may be an alternator or battery take it to your local car part store to.get it tested for free. If the car doesn't run pull the alternator and battery to have them tested.

Posted on Dec 01, 2014

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Our 2007 Ford Freestyle 3.0V6 shows B1318 code, also scanner shows low battery voltage module. Car shuts off.Please help what to do to fix?


Which module ?

B1318 Battery Voltage Low Audio Control Module REFER to Section 414-00 . B1318 Battery Voltage Low DSM REFER to Section 414-00 . B1318 Battery Voltage Low DVD Player REFER to Section 414-00 . B1318 Battery Voltage Low Instrument Cluster REFER to Section 414-00 . B1318 Battery Voltage Low RCM REFER to Section 414-00 . B1318 Battery Voltage Low Satellite Radio Receiver REFER to Section 414-00 . B1318 Battery Voltage Low SJB REFER to Section 414-00 .
According to this charging system isn't working correctly ! This is a computer controlled charging system .
Principles of Operation
The powertrain control module (PCM) controlled charging system determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. This system is unique in that it has 2 unidirectional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated (PWM). The generator communication (GEN COM) line communicates the desired setpoint from the PCM to the voltage regulator. The generator monitor (GEN MON) line communicates the generator load and error conditions to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.
The charging system voltage is controlled by the PCM. The generator charges the battery and at the same time supplies power for all of the electrical loads that are required. The battery is more effectively charged with a higher voltage when the battery is cold and a lower voltage when the battery is warm. The PCM is able to adjust the charging voltage according to the battery temperature by using a signal from the intake air temperature (IAT) sensor. This means the voltage setpoint is calculated by the PCM and communicated to the regulator by a communication link.
The PCM simultaneously controls and monitors the output of the generator. When the current consumption is high or the battery is discharged (the PCM recognizes this and increases the output of the generator to accommodate), the system is also able to increase the idle speed to increase the charge.
To minimize the engine drag when starting the engine, the PCM does not allow the generator to produce any output until the engine has started. The PCM then progressively increases the output of the generator.
The PCM turns the charging system warning indicator off after the engine is started and illuminates it under fault conditions (when the generator is not generating the correct amount of current with the engine running). The charging system warning indicator is also illuminated by the PCM whenever the key is ON with the engine OFF.
This is a System 4 charging system, which uses the GEN MON and GEN COM lines to control and monitor the charging system through the PCM. System 4 charging systems are virtually identical in design and therefore, share the same diagnostics. The circuit numbers and colors may be different, but the functions are the same.

Jun 30, 2017 | Ford Cars & Trucks

1 Answer

My 2008 Dodge Dakota is sending the code P0562. How do I fix this problem ??


Possible causes-- Low battery charge
- Battery defective
- Loose or missing alternator drive belt
- Faulty alternator
- Open or short system voltage circuit

Start by checking battery voltage.

Sep 20, 2014 | 2008 Dodge Dakota

2 Answers

2004 dodge ram 1500 4X4 5.7 hemi - runs rough & dies at slow speeds but okay at fast speeds. diagnostic code P0157 o2 circuit low voltage bank 2 sensor 2 is shown. how to fix?


Usually the code means the O2 sensor is faulty.
But in your case it could mean there is a problem with the fuel system on bank two. Bank two is the side with cylinder two.
A low voltage reading from the sensor would mean that side is very lean if the sensor is working and the sensor in front of the catalytic converter shows the same readings.

Feb 01, 2013 | Cars & Trucks

2 Answers

Check engine light low voltage o2 sensor 04 chevy ventura


your code must be P0131, a P0131 code refers to the first oxygen sensor on Bank 1. P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 1 is located in front of the catalytic converter.
The solution is you can:
1.Replace faulty sensor.
2.Repair short, open, or high resistance on o2 signal circuit. FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook

Jul 02, 2011 | 2004 Chevrolet Venture Passanger

1 Answer

Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...


OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

Nov 06, 2010 | 1999 Buick LeSabre

1 Answer

Massage said low ref ac off what dose that mean thanks


that means low refrigerant available and the low pressure switch is preventing the compressor from damaging itself. You will need freon added to the system which in not uncommon since mobile a/c systems normally leak a small amount each year and eventually need topped off to work properly. Either buy some freon from a parts store or find an independant repair shop that will agree to just add the freon necessay to make the system work again. Freon necessary on most systems ranges from 1 to 2 pounds and freon bought in bulk by all shops costs $3 a pound and labor to do this is about a half hour so look at their labor rate and add a reasonable profit for the freon and this is what it should cost. If this helps please reply cause that helps me and good luck

Apr 29, 2010 | 1998 Cadillac DeVille

3 Answers

Wat does code p1400 means


In order to give you accurate information. I need size of engine example 2.0 L 3.0L. but code P1400 means Differential Pressure feedback EGR circuit low input. Maybe your differential oil is low.

Apr 01, 2010 | 2002 Ford Taurus

4 Answers

1998 jeep cherokee sport- i get a code p1682.


P1682 - Charging system voltage to low.

Nov 23, 2009 | 1998 Jeep Cherokee

1 Answer

Brake light stays on


code 22 is a problem at coolant temp.sensor voltage too high or too low,the brake warning light could mean that fluid is low and u have a lost of pressure,brake line leak,leaking rear brake cylinder,worned out brakes,defective master cylinder or a defective handbrake and the switch stays on.youll have to check brake system!

May 27, 2009 | 1987 Plymouth Reliant

2 Answers

2000 lincoln ls i got a trouble code p1633 (KAM)voltage to low


P1633 means KAM (Keep Alive Memory ) Voltage too low. the KAM is caused by low battery voltage and you replace the battery.When you replace the battery the KAM loses Memory and the problems resulting in what you are experiencing now.When replacing a new battery, reconnect the Positive cable first.And use a trickle battery charger set low to the cables before disconnectng the battery . this will keep the voltage to the ECM powered with enough voltage. All you can do now is make the computer relearn the way it should run. Disconnect the negative cable from the battery, wait a while 20 seconds or so. then reconnect the cable. I do not know if this is a temporary fix or not but it should re-program the computer.

Nov 19, 2008 | 2000 Lincoln LS

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