B1671

Code

LAND ROVER B — Body

Battery module voltage out of range

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 32 RU: 14

AI status

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Page language: EN

Causes

Weak, discharged or overcharged 12V battery
Faulty battery monitoring sensor or battery module
Poor or corroded battery/ground connections
Open/short or high-resistance wiring between battery and control module
Faulty charging system (alternator/regulator) causing under- or over-voltage
Body control module (BCM) or battery monitoring module fault or software issue

Symptoms

DTC B1671 illuminated and/or battery warning lamp on dash
Intermittent electrical faults or parasitic drains
Possible difficulty starting the vehicle or slow cranking
Accessory or body systems resetting or behaving erratically
Jump-start or charging system warnings

What to check

Read and record freeze frame and live data from vehicle scan tool (battery voltage, battery module data, status flags)
Measure battery terminal voltage with a quality multimeter (engine off and engine running)
Inspect battery terminals, harness connectors and ground straps for corrosion, tightness and damage
Check charging system output (alternator voltage and regulator function) under load
Perform visual inspection of battery monitoring module and associated wiring for water damage or chafing
Check for other stored codes (U- or P-codes) that indicate communication or charging faults

Signal parameters

Expected battery voltage (engine off): ~12.2–12.8 V (charged battery)
Expected battery voltage (engine running): ~13.5–14.8 V (alternator regulating)
DTC threshold: battery module/BCM detects voltage outside calibrated upper/lower limits (manufacturer specific)
Sampling: voltage typically sampled continuously or at ignition events; compare instantaneous and averaged values
Communication: battery module transmits voltage data over CAN/vehicle network to BCM

Diagnostic algorithm

Connect a calibrated scan tool and read all stored/active DTCs and relevant freeze frame data. Note voltage values and timestamps.
Visually inspect battery, terminals, ground straps and battery-monitoring module connectors. Clean and tighten terminals as required.
With engine off, measure battery terminal voltage at the battery posts using a DVM. Compare to expected charge (12.2–12.8 V).
Start engine and measure charging voltage at battery posts. Confirm alternator output is within ~13.5–14.8 V. Investigate alternator if out of range.
Backprobing: monitor live voltage values reported by the battery module and compare to direct battery measurements. Look for disagreement or intermittent spikes.
Wiggle test harness and connectors while observing live data for intermittent faults. Check for corrosion, water ingress, damaged pins.
If wiring and connections are good but reported voltages are incorrect, test/replace the battery monitoring sensor/module or its connector as per service manual.
Check for BCM or network communication errors (U-codes). If present, follow module communication diagnostics before replacing hardware.
Apply battery load test or replace battery if capacity is low or internal resistance high. Re-test after battery service.
Clear codes, perform relevant relearn/calibration procedures if module or battery was replaced, then road/test to confirm the fault does not return.
If the problem persists, consult manufacturer technical service bulletins and consider software reflash of BCM/battery module before component replacement.

Likely causes

Low battery state of charge or failing battery causing voltage below threshold
Loose or corroded battery terminals or poor ground causing inaccurate readings
Battery sensor/module failure or internal fault in the battery pack monitor
Alternator/regulator producing excessive voltage (overcharging)
Faulty wiring between battery and battery monitoring/BCM (short to ground or open circuit)

Fault status

⚠️ Status

Battery module voltage is outside the allowed range. Check battery condition, charging system, wiring and battery monitoring module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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