B1676: How to Diagnose & Fix — Battery Pack Voltage Out Of Range
4 vehicles · 3 makes · $100-$1,200 repair
How to diagnose and fix B1676: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Lincoln Nautilus · 2019–2022
Nautilus owners frequently report the Auto Start-Stop system behaving erratically — failing to engage, failing to auto-restart smoothly at the light, or throwing a system-fault/malfunction message. The most common root cause is the 12V battery state-of-charge falling below the threshold the system needs (the AGM start-stop battery degrades faster than a conventional battery), so the system disables itself or restarts roughly. The popularity of plug-and-play 'start-stop eliminator' modules for the Nautilus reflects how much the behavior annoys owners.
Common Symptoms
- Auto Start-Stop won't shut the engine off at stops
- Rough or delayed engine auto-restart
- Start-Stop 'not available' or fault message
- Feature works intermittently / disables itself
- Frequent dead or weak battery
How to Fix
Test the 12V battery and charging system; replace a weak or aged AGM battery with the correct spec and perform a Battery Monitoring System (BMS) reset so the PCM relearns state-of-charge. Ensure parasitic-draw and software are current. Owners who simply dislike the feature use the dash defeat button each drive or a plug-and-play disable module (not a repair, a preference).
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Duralast Platinum H7/94R AGM battery, 850 CCAOEMH7-AGM / AutoZone 319458
Replace a failed 12-volt start-stop AGM battery after charging-system and draw/BMS diagnosis Fitment/availability: Live In Stock/Add to Cart page identifies H7-AGM, BCI 94R, AGM technology, 80 Ah, 850 CCA and matching terminal layout. Fo…
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Sources for this issue (2)
Lincoln Nautilus · 2024–2024
Roughly 46% of polled 2024 Nautilus owners (both ICE and hybrid) report repeated dead 12V batteries, sometimes with as little as 200 miles on the odometer. Two software-related causes identified: (1) Vehicle Dynamics Module stays awake and holds the CAN bus active after key-off (CSP 24P14), and (2) Driver Status Monitor Camera Module software keeps running after vehicle is off (CSP 24P08). A separate hardware-level fix for affected vehicles involves replacing the audio amplifier and 12V AGM battery when parasitic draw remains out of spec after the CSPs are applied.
Common Symptoms
- no-start after sitting overnight
- clicking when pressing start button
- dim dome lights
- battery low message
- needs frequent jump start
How to Fix
Have dealer apply software updates CSP 24P14 (VDM reprogram) and CSP 24P08 (Driver Status Monitor Camera Module reprogram), test 12V AGM battery state-of-health, and measure parasitic draw. If draw still exceeds spec, request audio amplifier replacement and a new battery — both covered under bumper-to-bumper warranty. An OTA update consolidating these fixes is anticipated.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (3)
Jaguar XK · 2007–2015
XK owners frequently report flat batteries from parasitic draw when a control module fails to enter sleep mode. Normal quiescent draw should fall to roughly 30-50 mA within about three minutes of lock-up; faulty cars have been measured at 200-220 mA, enough to reach 50% state of charge in under two weeks. The Body Control Module (BCM) is a documented culprit (including cases of burnt board traces/failing capacitors), and the fault is worst on cars driven infrequently.
Common Symptoms
- Flat/dead battery after a few days of sitting
- Quiescent draw well above ~50 mA
- Intermittent electrical gremlins, worse in winter
- Modules waking after lock / car not sleeping
How to Fix
Measure quiescent current after the car has gone to sleep, then use the fuse-pull method (allowing re-sleep between pulls) to isolate the circuit/module. Repair or replace the offending module (commonly the BCM) or the stuck accessory. Keep the car on a smart maintainer if it sits, and verify the battery itself is healthy before chasing the drain.
Sources for this issue (2)
Ford Explorer · 2016–2020
Ford F-150 Lightning · 2022–2025
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B1676 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B1676 mean?
B1676 stands for "Battery Pack Voltage Out Of Range." A control module reports that its supply voltage has left the acceptable operating window. Ford's published criterion is battery voltage below roughly 9.7 volts for more than about 210 ms with vehicle speed above 20 km/h (12 mph), or above roughly 18 volts at any time. It is a supply-quality code that many Ford-family modules can set, and it commonly appears as a companion code when a weak or degraded 12V battery causes voltage sag during cranking or during auto start-stop restarts. Because the code is set by whichever module saw the sag, it must be read together with that module's identity — when it is stored by the ABS module on Ford-family vehicles it is frequently caused by an internal module fault rather than the battery itself.
What are the most common causes of B1676?
The most common causes of B1676 are: Weak, sulfated or end-of-life 12V battery (voltage sag under load or during auto-restart), Failing alternator / charging system, or overcharging producing high-voltage spikes, Corroded, loose or high-resistance battery terminals and ground straps, Blown module fuse, open or shorted module power/ground harness, Poor connector contact at the module; internal ABS module failure on some applications. The specific cause varies by vehicle.
How much does it cost to fix B1676?
Repair costs for B1676 range from $100 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by B1676?
Au7o has documented B1676 across 4 vehicle models from 3 manufacturers: Ford, Jaguar, Lincoln.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.