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Low voltage battery - Cars & Trucks

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Hi Ciro, I really would like to have more information! have the battery checked to make sure its still good. Check that the alternator belt is tight and that the alternator is charging at the correct voltage. Regards John

Posted on Feb 11, 2012

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Posted on Jan 02, 2017

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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 low beams went out on 1983 pu but i still have high beams, battery was boiling, just replaced voltage regulator


Was it a medium sized wire? If so yes put it back on the battery because this is the charging wire for the battery. The low beams may be simple, they may have burnt out when the voltage reg. failed. low beams were on the most giving them the most over voltage causing early dimise

Sep 22, 2012 | 1983 Toyota Pickup

1 Answer

Headlight wiring low voltage


A battery's voltage is properly tested under load. This sounds like your battery is low on fluid or has not been charging properly. Not charging properly could be from low battery fluid, poor cable connections or a failing alternator. You did not state whether you tested this voltage issue with the vehicle running or not. If the vehicle was running when you observed this change in voltage upon turning on the headlights, then a bad alternator is most certainly suspect.

Aug 26, 2012 | 2004 Toyota Sequoia

1 Answer

Codes are reading low tps voltage, mapps high voltage ignition on low voltage at idle. Idle surges sputers and stalls when driving. Replaceed mapp and tps with no improvment?


Have you consider to check the battery power. I believe the main problem you have is either the battery or the alternator. Due to these two things with low voltage the brain ( ECU ) does not have the enough power to work. Good Luck.

Aug 15, 2012 | 1992 Chevrolet S-10 Blazer

1 Answer

2004 chrysler sebring 3.0 stalls and will not idle. Engine lite came on and scanner said TPS low voltage on one side. I replaced TPS and it temporarily idled ok. Engine light is now off. Runs fine except...


This is where proper diagnosis comes in...as the TPS sensor voltage low because of a failed TPS sensor? Or was the TPS voltage low due to low battery voltage at the control module? Did you bother to check for the proper voltage at the TPS sensor connector before throwing parts at the problem? If the battery voltage goes low, it is NORMAL for the engine to not idle correctly. Low voltage at the control module can cause the computer to lose all of its "learned" data. It will have to "re-learn" how to idle the engine. This can sometimes take a few days. This is exactly WHY I keep telling people to not be disconnecting batteries in an attempt to "clear" computer fault codes.
If your battery has been going dead, you need to properly test and diagnose your battery and charging system. If this system is not working correctly, there is NO WAY your computer network can function correctly. - this MUST be diagnosed and repaired FIRST!

May 18, 2012 | 2004 Chrysler Sebring

1 Answer

What iz the voltage of the battery


The fully charged battery voltage should be 12 volts.If its low then car will have starting problems.If there is no voltage then car will not start.In case if there is no voltage to the battery,then either is dead/faulty battery or the battery is drained.If it shows no voltage or low voltage,then get you battery charged at local car garage. ------- If its not getting charged at car garage then battery is faulty and it has to be replaced.------------This will help.Thanks . Helpmech.

Dec 16, 2010 | 1999 Ford Expedition

1 Answer

Just scanned my 1999 300m. It went into safe mode while me wife was driving it home- 2nd gear only. It had a code P1714 and P0700 come up on the scanner. I can't find anything about the P1714.


Definition of Diagnostic Trouble Code P1714 Chrysler: Low Battery Voltage Dodge: Low Battery Voltage Ford: Shift Solenoid A Inductive Signature Jaguar: Shift solenoid A inductive signature malfunction Jeep: Low Battery Voltage Lincoln: Shift Solenoid A Inductive Signature Mazda: Shift Solenoid '1' Mechanical Fault Mercury: Shift Solenoid A Inductive Signature Subaru: Throttle position sensor power circuit for automatic transmission
Definition of Diagnostic Trouble Code P1714 Chrysler: Low Battery Voltage Dodge: Low Battery Voltage Ford: Shift Solenoid A Inductive Signature Jaguar: Shift solenoid A inductive signature malfunction Jeep: Low Battery Voltage Lincoln: Shift Solenoid A Inductive Signature Mazda: Shift Solenoid '1' Mechanical Fault Mercury: Shift Solenoid A Inductive Signature Subaru: Throttle position sensor power circuit for automatic transmission
Definition of Diagnostic Trouble Code P1714 Chrysler: Low Battery Voltage Dodge: Low Battery Voltage Ford: Shift Solenoid A Inductive Signature Jaguar: Shift solenoid A inductive signature malfunction Jeep: Low Battery Voltage Lincoln: Shift Solenoid A Inductive Signature Mazda: Shift Solenoid '1' Mechanical Fault Mercury: Shift Solenoid A Inductive Signature Subaru: Throttle position sensor power circuit for automatic transmission
That code is low battery voltage on a chrysler

Jun 12, 2010 | Cars & Trucks

2 Answers

Low voltage at low revs


Your alternator is on the way out,replace with new or rebuilt. you can remove alternator and have it bench tested to be sure.

Feb 19, 2010 | 1999 Jeep Cherokee

1 Answer

The car battery light is on but the vehicle runs normally.


Battery light being on indicates low or over voltage at the battery. Have some one check the voltage with a voltmeter. Voltage too low will eventually run down the battery and voltage too high can damage the battery and other parts.

Oct 17, 2009 | 1997 Pontiac Grand Prix

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