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Home / DTC / B2348 — voltage failure in low voltage in the common positive reference source tension

B2348 — voltage failure in low voltage in the common positive reference source tension

Detailed page for trouble code B2348.

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Code

B2348

LAND ROVER B — Body

voltage failure in low voltage in the common positive reference source tension

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak or discharged battery
  • Poor battery terminals or cable connections (high resistance)
  • Blown fuse or faulty supply relay for the common positive reference circuit
  • High-resistance wiring or connector corrosion in the positive supply circuit
  • Short to ground or excessive parasitic draw on the reference circuit
  • Faulty alternator or charging system (insufficient charging voltage)

Symptoms

  • Multiple electrical systems inoperative or intermittent (windows, locks, lights, infotainment)
  • Dashboard warning lights (battery/charging, module warnings) or stored module faults
  • Modules reporting loss of supply or communication errors
  • Vehicle may not start or may crank slowly if battery/charging affected
  • Fuses or relays may show thermal damage or discoloration

What to check

  • Read and record all stored DTCs and freeze frame data from all modules
  • Measure battery resting voltage (key off) and voltage with ignition on and engine running
  • Inspect battery terminals and main ground and positive connections for corrosion/tightness
  • Inspect relevant fuses and relays for the common positive reference circuit and verify continuity
  • Probe the module connector pin for the common positive reference with respect to ground (key on)
  • Check charging system output (alternator/regulator) under load

Signal parameters

  • Expected battery/rest voltage (key OFF): ~12.2–12.8 V (healthy battery)
  • Expected supply voltage (ignition ON, engine OFF): ~11.5–13.5 V depending on load
  • Expected charging voltage (engine running): ~13.5–14.8 V
  • Fault threshold: supply significantly below battery/charging voltage (commonly < 9–11 V under expected conditions) or unstable/dropouts
  • Cranking voltage: typically should not drop below ~9–10 V on healthy systems (dependent on battery)

Diagnostic algorithm

  1. Record all DTCs and freeze frame data from all modules; note any related codes (voltage, communication).
  2. Verify battery state of charge and condition (conductance or load test). Charge or replace battery if weak.
  3. Turn ignition ON and measure voltage at battery positive and at the affected module's common positive reference pin. Compare values and note any significant drop.
  4. Inspect and clean battery terminals, main positive cable connections, and chassis/engine grounds. Re-measure voltage.
  5. Check fuses/relays supplying the common positive reference; verify continuity to battery and to module connector pins.
  6. If voltage is low at module but OK at battery, trace and test wiring between battery/fuse/relay and module for high resistance, opens, or short-to-ground. Wiggle harnesses while monitoring voltage to reveal intermittent faults.
  7. Perform parasitic draw test if battery discharges when vehicle off. Isolate circuits to find offending load.
  8. Verify alternator/charging output under load. Repair charging system if it fails to maintain voltage.
  9. If wiring, fuses, relays, battery and charging system are confirmed good and voltage issues persist only at the module, consider module supply pin/connector damage or internal module fault. Follow manufacturer procedures before replacing module.
  10. After repairs, clear DTCs, perform functional checks, and recheck for reoccurrence under representative operating conditions.

Likely causes

  • Battery voltage below expected range (battery health or state of charge issue)
  • Loose or corroded battery terminal or engine bay connector causing voltage drop
  • Open or high-resistance fuse/relay in the common positive feed
  • Damaged wiring (chafing, pinched, melted) causing voltage loss under load
  • Intermittent short to ground or heavy load placed on the reference circuit
  • Charging system not maintaining rated voltage

Fault status

⚠️ Status
Stored when the common positive reference supply voltage is detected below the required threshold or is unstable. The fault may be logged with associated module communication or supply faults and freeze-frame data indicating measured voltages at the time of fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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P0562 U0100 B2349 B2350 B0001
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Code

B2348

Other B — Body

Mirror Switch Reference Voltage Positive Common Supply Voltage Fault

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak or discharged battery
  • Poor battery terminals or cable connections (high resistance)
  • Blown fuse or faulty supply relay for the common positive reference circuit
  • High-resistance wiring or connector corrosion in the positive supply circuit
  • Short to ground or excessive parasitic draw on the reference circuit
  • Faulty alternator or charging system (insufficient charging voltage)

Symptoms

  • Multiple electrical systems inoperative or intermittent (windows, locks, lights, infotainment)
  • Dashboard warning lights (battery/charging, module warnings) or stored module faults
  • Modules reporting loss of supply or communication errors
  • Vehicle may not start or may crank slowly if battery/charging affected
  • Fuses or relays may show thermal damage or discoloration

What to check

  • Read and record all stored DTCs and freeze frame data from all modules
  • Measure battery resting voltage (key off) and voltage with ignition on and engine running
  • Inspect battery terminals and main ground and positive connections for corrosion/tightness
  • Inspect relevant fuses and relays for the common positive reference circuit and verify continuity
  • Probe the module connector pin for the common positive reference with respect to ground (key on)
  • Check charging system output (alternator/regulator) under load

Signal parameters

  • Expected battery/rest voltage (key OFF): ~12.2–12.8 V (healthy battery)
  • Expected supply voltage (ignition ON, engine OFF): ~11.5–13.5 V depending on load
  • Expected charging voltage (engine running): ~13.5–14.8 V
  • Fault threshold: supply significantly below battery/charging voltage (commonly < 9–11 V under expected conditions) or unstable/dropouts
  • Cranking voltage: typically should not drop below ~9–10 V on healthy systems (dependent on battery)

Diagnostic algorithm

  1. Record all DTCs and freeze frame data from all modules; note any related codes (voltage, communication).
  2. Verify battery state of charge and condition (conductance or load test). Charge or replace battery if weak.
  3. Turn ignition ON and measure voltage at battery positive and at the affected module's common positive reference pin. Compare values and note any significant drop.
  4. Inspect and clean battery terminals, main positive cable connections, and chassis/engine grounds. Re-measure voltage.
  5. Check fuses/relays supplying the common positive reference; verify continuity to battery and to module connector pins.
  6. If voltage is low at module but OK at battery, trace and test wiring between battery/fuse/relay and module for high resistance, opens, or short-to-ground. Wiggle harnesses while monitoring voltage to reveal intermittent faults.
  7. Perform parasitic draw test if battery discharges when vehicle off. Isolate circuits to find offending load.
  8. Verify alternator/charging output under load. Repair charging system if it fails to maintain voltage.
  9. If wiring, fuses, relays, battery and charging system are confirmed good and voltage issues persist only at the module, consider module supply pin/connector damage or internal module fault. Follow manufacturer procedures before replacing module.
  10. After repairs, clear DTCs, perform functional checks, and recheck for reoccurrence under representative operating conditions.

Likely causes

  • Battery voltage below expected range (battery health or state of charge issue)
  • Loose or corroded battery terminal or engine bay connector causing voltage drop
  • Open or high-resistance fuse/relay in the common positive feed
  • Damaged wiring (chafing, pinched, melted) causing voltage loss under load
  • Intermittent short to ground or heavy load placed on the reference circuit
  • Charging system not maintaining rated voltage

Fault status

⚠️ Status
Stored when the common positive reference supply voltage is detected below the required threshold or is unstable. The fault may be logged with associated module communication or supply faults and freeze-frame data indicating measured voltages at the time of fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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