make a purchase, we may earn a small commission. grill/bumpers compatible? The light may appear in red or amber color and show the CHG or ALT icons. Good luck. . He said (What is the Difference), What is a Serpentine Belt & When Should You Replace It. Come join the discussion about Silverados, Sierras, and other full size trucks performance, modifications, suspension, lift kits, tires, maintenance, and more! This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Replace the Electronic Control Unit (ECU). Once the car has stopped moving, it could be a sign of a faulty alternator. The light indicator usually shows you that the battery is no longer working or the alternator has ceased functioning. The Chevy service battery charging system is a series of electrical components that allow a Chevrolet service battery to be charged. 1596 Technical Service Bulletins (TSBs) have been issued for the 2007 Chevrolet Tahoe. Think there is one. This is beneficial for the battery as it will not be subjected to sudden spikes in voltage and can potentially last longer with a more even charge. For a better experience, please enable JavaScript in your browser before proceeding. I had the old battery checked and replaced shortly after I bought the truck a couple of months back since it had trouble starting. As the owner of a 2008-2013 model year Chevrolet Tahoe or GMC Yukon, or 2009-2013 model year Cadillac Escalade, Chevrolet Silverado LD or GMC Sierra LD hybrid 2-mode vehicle, your . Also, check if the harness connector that holds the alternator is much secure. Ben, if your talking about the one that is right there by the cylinder head on the passenger side, it is good and tight, haven't checked it for voltage drop or resistance yet. Other daily symptoms include flickering lights and screens while at idle. Once again, this is a on/off pulsed signal and the ECM communicates performance back to the BCM. was to come, Sounds like they did the alternator test that I described. . me off it starts up no problem. The most likely causes are the battery, fuel pump, starter, ignition switch, battery cable or a wiring fault. The BCM will command charge mode for 2-3 minutes and then determine which mode to enter depending on voltage requirements, In addition to all these charging modes, the old ALT/BAT light has been changed to Service Battery Charging System. The indicator will illuminate under these conditions: The ECM detects generator output is less than 11 volts or greater than 16. My Tahoe does the same thing. Thanks for the insight, gang! If the battery light comes with a temperature light, you should avoid any activity with the vehicle. If your Tahoe's engine won't crank or cranks very slowly, then the most likely culprit is a weak or dead 12v battery. Reset the ECU. chargers with a slow charge mode use the most electricity to recharge a battery and are best for charging a battery over a longer period of time. Hello, I can not believe that I've been in here since 2018 and never Posted! The alternator produces an electrical current to operate accessories and charge up the battery. You need to locate the black/white wire that runs from the B+ pin on the alternator and battery cable junction block and check it for continuity. When your "Service Charging System" light turns on, the first thing you should do is make sure that the battery is fully charged. My guess judging by the gauge it was about 15-16v. Had AAA put in a battery and getting service battery charging system message. The charging voltage is set to 14.3 volts for 30 seconds. Look for a worn-out or loose drive belt, alternator connection problems, loose alternator mounting bolts, and corrosion and dirt around the battery case and cables. This morning the "Service Charging System" message came on and the battery light - Answered by a verified Chevy Mechanic . an alternator and someone else will It was released during a recession when many people were being careful with their money and were less willing to splurge on a hybrid SUV. Normal duty cycle for the current sensor is between 5-95%. Service battery charging system 40 Answers. Voltage is regulated between 13.9-14.5 volts. 10K views 2 months ago Causes and fixes for a Chevy or GMC that has a "service battery charging system" message on the dashboard. As mentioned earlier, the light is a sign that the alternator has stopped charging the battery, thereby preventing your cars electrical system from acquiring the complete power it desires. You must log in or register to reply here. Siouxicide 11-01-2009, 11:02 AM The BCM will command Fuel Economy Mode when it measures air temperature to be at least 32F but less than 176F, and the battery current is less than 15 amps but greater than -8 amps, and the SOC is greater than or equal to 80 percent. Ensure there is a greater output in the alternator output as the car engine runs at 2000 RPM. I'll unplug and plug the sensor back . Good luck. Next, you should implement the No-Load Test and Load Test. He Loveswriting about Automotive Diagnostics and Repair, Trouble codes, Buyer guides for various car parts and accessories, and lots more. Heres an example of the correlation between duty cycle and voltage output, 10% 11 V 20% 11.56 V 30% 12.12 V 40% 12.68 V 50% 13.25 V 60% 13.81 V 70% 14.37 V 80% 14.94 V 90% 15.5 V. In addition to controlling how much power the generator puts out, the EPM is executes several program modes. off. battery cables first. However, the BCM will command a voltage reduction mode if the battery temperature is above 32F and the battery current is less than 1 amp but greater -7 amps. Tomorrow I just Set the Battery Tester to its ammeter function. I had the battery and charging system checked and all are up to specification. A Tech2, the computer used by the dealerships for these trucks, can see the health of the battery and alternator. My guess judging by the gauge it was about 15-16v. As said, it might occur for several reasons; it could be a problem of low voltage battery, alternator, battery connections, broken wire, and others. I've replaced the Again, the voltage regulator helps to keep the battery fully charged. You will have to replace your alternator if he finds the voltage below normal, as the old one is defective. Engine & Drivetrain . I recently had my engine rebuilt and i am now getting the message "service the battery charging system". Prescott. A ground battery charging system allows the battery to be constantly topped off and will constantly be charging. i purchase a new battery for my vehicle every 5 years regardless. Also Read: Car Stutters When Starting (How To Fix). It was over a 3+ hour period for me though (and I forgot my dome lights were on). Battery is probably nearing EOL. What are the four stages of a Chevrolet service battery charging system? These vehicles IMO struggle in the summer time with the huge loads from dual ac/cooling fans at idle. If it reads up to 9.6 volts at 21C, it means the battery has good capacity. The other day it came up again. The voltage regulator produces a fixed output voltage, which keeps the system from overloading. This includes wires, fusible links, etc. 2007 Chevrolet Tahoe TSBs 839 Tahoe Technical Service Bulletins. And make no mistake, the Tahoe Hybrid was a splurge. If I don't start it up at With both terminals connected, you will ideally look for a figure of around 12.6 volts or more. I had the old battery checked and replaced shortly after I bought the truck a couple of months back since it had trouble starting. The The 2012 Chevrolet Colorado is the perfect size pickup for running errands on the weekend and doing light duty chores around . The battery was tested at the dealership and it came up good. Mar 9, 2017 . I monitored closely thereafter, 10 to 20 minutes later voltage climbs back to normal. A charged battery is also more likely to provide a longer battery life because it is more resistant to being discharged. you are brave to drive it like that, if the voltage is low eventually it will crap out on you. If you want to drive with the battery light on, it should for a short period. Evidently the battery was dead and the system shut down. Mark helpful 60 coley8518 answered 8 years ago If not then the alternator is the problem. Besides the warning my headlights, dash lights and interior lights flicker. Here are a few things to fix your charging system warning light: A. Thanks in advance. . "Service Battery Charging System" warning. Make sure battery has a full charge and connections all good. Message On My 2007 Tahoe 'Service Battery Charging System' - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. The battery was tested at the dealership and it came up good. and rev up engine to approx. Whenever your vehicle refuses to start, it is caused by a bad battery that couldnt hold a charge. The four stages of a Chevrolet service battery charging system are: A float battery charging system allows the battery to float or be in equilibrium with the charging system. Now the car wouldn't start, just as with any "dead . I had sat at my son's baseball practice for about ten minutes with the key on prior to this. Performing the repair yourself, however, may cost less. 2004 chevy tahoe battery not charging light is on here is how i solve my battery/charging issues: 1. as preventative maint. take it to the mac. passes the load test, then Id move to Battery sulfation mode is used to help maintain the battery life. Plugin your car diagnostics scanner (We recommend the iCarsoft i900 or the Autel MS300) Turn on the ignition, followed by the scanner. Did you get to the bottom of this? Once the battery loses its charge, it triggers the voltage regulator to send a message to the alternator to recharge the battery. It is not advisable to drive with the service battery charging system indicator on, as it could leave you potentially stranded by the roadside. This is on a 2008 Tahoe LTZ with 125K miles. We had this message come up on the console a few weeks back. Any work done to the truck recently? JavaScript is disabled. What can I check to make sure it doesn't show up again. Keep the voltage within 13.0 to 15.0 volts while the engine runs at 2,000 rpm. The water pump usually uses the same belt that powers the alternator. What does a charged battery indicate on a Chevrolet service battery charging system? I hope this helps you. service battery and charging system appears and disappears on warning monitor needle comes to discharge and charge and battery lite on dash comes on, new battery same problem 3 Answers 235 shawns2005vette answered 8 years ago Seems to be a very common problem with this year and model. napa and Audo zone check the battery, starter, and Seems to be a very common problem on who you talk to someone will call it