Ford B1676 Code: Battery Pack Voltage Out of Range
The ABS or another Ford module saw its supply voltage go too low or too high, and it shut its function down.
Safety first · Consult a professional
- Braking system affected: ABS may be disabled. Drive carefully and have it checked promptly.
At a glance
Severity: Moderate
- Meaning
- Battery Pack Voltage Out of Range
- System
- Body Systems · Body
- Safe to drive?
- With caution
- Typical repair cost
- $20–$1,400
- DIY difficulty
- Moderate
Despite the name, B1676 on a gasoline or diesel Ford has nothing to do with a hybrid battery pack. It is a supply-voltage code, most often logged by the anti-lock brake module, that sets when the voltage the module receives is outside its working window in either direction. Ford service information for the ABS module describes it as roughly below 9.7 V for a fraction of a second while driving above about 12 mph, or above about 18 V at any time; other modules use similar limits. While the voltage is out of range the ABS module turns off ABS and often traction control, so the warning lights come on. Unlike B1318, which only flags low voltage, B1676 also catches overcharging and voltage spikes, and it often points to the module's own fuse, feed or ground rather than the battery.
Can I keep driving? Normal braking works, but ABS and traction control may be off while the fault is active, so leave extra stopping distance on wet or icy roads. If the battery light is on or the lights flare bright, have the charging system checked right away.
How to read B1676
- B Body
- 1 Manufacturer-specific
- 6 Body Systems
- 76 Specific fault
Symptoms
- ABS and traction control lights on, sometimes together with the red brake warning light
- Warning lights that come and go over bumps or when high electrical loads switch on
- Headlights flickering or getting unusually bright at higher rpm (overcharging)
- No-start or slow crank after a night parked (low battery)
- Code stored right after a jump start or a battery charger was used in boost mode
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Poor power or ground at the ABS module: corroded connector pins, loose ground eyelet, damaged fuse box terminal
- Weak battery or loose battery clamps causing voltage to dip below the limit while driving
- Alternator fault: failed regulator overcharging, or a failing diode causing heavy voltage ripple
- Blown or corroded ABS fuse (module or pump feed)
- Voltage spike from a jump pack, a 24 V booster or a charger connected while the ignition was on
- Internal ABS module fault in its supply monitoring
Diagnosis step by step
Check which module stored it and the other codes
Scan all modules. B1676 in the ABS module together with C1185 or a lost-communication code points to the module's power supply; B1676 in several modules at once points to the battery or alternator.
Tools: OBD-II scanner
Test battery and charging voltage
Resting voltage should be about 12.6 V, and 13.8 to 14.8 V at idle with loads on. More than about 15 V means the regulator is overcharging and can set B1676 on its own.
Tools: Multimeter
Check alternator ripple
Set the meter to AC volts and measure across the battery with the engine running and loads on. More than roughly 0.5 V AC suggests a failed diode, which can confuse sensitive modules even when the DC voltage looks fine.
Tools: Multimeter
Measure voltage at the ABS module
Back-probe the module's battery and ignition feed pins with the engine running and compare with battery voltage. A difference of more than about 0.5 V means resistance in a fuse, fuse box terminal or wire.
Tools: Multimeter, Flashlight
Voltage-drop the module ground
Measure between the module's ground pin and the battery negative post while the key is on. More than about 0.2 V points to a corroded ground eyelet on the frame or inner fender, a very common find on older trucks.
Tools: Multimeter
Inspect the connector and clear
Unplug the ABS connector, look for green corrosion or spread terminals, clean and apply dielectric grease sparingly. Clear the codes and road test above 20 mph.
Tools: Screwdriver, Flashlight, OBD-II scanner
Where the parts are
- 1Battery
- 2Alternator
- 3Engine computer (ECM)
- 4CAN bus
- 5Transmission
- 6Wheel speed sensor
- 7High-voltage battery
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Clean / repair ABS module ground and connector | Yes | $50–$220 |
| Replace ABS fuse or repair fuse box terminal | Yes | $20–$250 |
| Replace battery | Yes | $150–$320 |
| Replace alternator (overcharging or ripple) | No | $350–$850 |
| Rebuild or replace ABS module | No | $250–$1,400 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Emissions / smog test impact
Depends
B1676 doesn't light the check engine light, so it won't fail the emissions part of a US smog check. In states with a safety inspection, the ABS light it turns on can cause a failure.
Frequently asked questions
My Ford isn't a hybrid. Why does it say battery pack?
The wording is historic. On conventional Fords B1676 simply means the module's supply voltage from the 12 V battery was outside its allowed range, too low or too high.
What's the difference between B1676 and B1318?
B1318 only reports low voltage and is usually logged by body modules. B1676 covers both low and high voltage and is typically logged by the ABS module, so it also catches overcharging and poor module supply connections.
Why do my ABS lights go off after restarting?
Once the voltage returns to normal, the module can re-enable ABS on the next ignition cycle. That on-and-off pattern is typical of a loose ground or a weak battery rather than a failed module.
Can jump-starting cause B1676?
Yes. A 24 V truck booster or a charger in boost mode can push system voltage over the limit, and a hard crank can pull it below. Clear the code after a jump start and see whether it returns.
Sources
- Manufacturer public service information (cross-checked)
- Methodology: How We Build Code Pages · Data Sources We Use · Editorial Policy