B13C8

Code

LAND ROVER B — Body

Presence light - Power supply B

Brand: LAND ROVER

Type: B — Body

Views: UK: 11 EN: 24 RU: 17

AI status

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Page language: EN

Causes

Blown fuse for presence light power supply B
Open or shorted wiring in power supply B circuit
Corroded/loose connector or poor ground at light module
Failed presence/ambient/puddle light module (LED unit)
Faulty body control module (BCM) or lighting control module output
Aftermarket modification or repair damaged wiring

Symptoms

Presence/puddle/ambient light does not illuminate or is intermittent
Lighting behaves inconsistently (flicker, on/off)
DTC B13C8 stored in BCM or lighting module
Possible battery drain if short to ground exists
Related lighting messages/errors on vehicle status display

What to check

Retrieve freeze frame and full module data with a diagnostic tool; note when the fault occurred
Visual inspection of wiring, connectors, and lamp unit for corrosion, damage or water ingress
Check fuses and fusible links for the presence light circuits (supply B)
Probe the lamp connector with key ON to verify supply voltage and ground
Check for continuity and shorts to ground/power between BCM and lamp
Swap or inspect known-good lamp/module (if available) to isolate module vs wiring

Signal parameters

Expected supply voltage at lamp connector with ignition/lighting ON: ~11–14 V
Supply voltage when OFF: near 0 V (unless circuits are battery-fed with retained function)
Ground continuity:
Module output command: digital command/CAN request present in BCM data (check with scan tool)
Current draw: low for LED lamp (typically

Diagnostic algorithm

Read and record all related codes and relevant module data with a diagnostic scanner. Note if faults are permanent or intermittent.
Perform visual inspection of lamp, connector, and wiring harness for obvious damage, corrosion or water entry. Repair any visible issues.
Check the appropriate fuse(s) for presence light power supply B; replace if blown and re-test. If fuse blows again, stop and investigate short.
With connector disconnected, measure supply voltage at the harness side with ignition/lighting ON. Confirm expected battery voltage (~12 V).
Measure continuity from the harness power pin back to the BCM output (with power removed). Check for opens or high resistance.
Check ground at the lamp: measure resistance to chassis ground and look for bad ground connections. Clean/secure ground if necessary.
If wiring and fuses are good, connect a known-good lamp or bench test the suspect lamp to verify lamp functionality.
Monitor BCM/lighting module outputs with a diagnostic tool while commanding the presence light ON/OFF. Verify the module is sending the correct command and that the supply responds.
If BCM output is absent or supply is present but module does not operate, consider replacing the lamp/module. If BCM output is incorrect and wiring is OK, evaluate module replacement or reprogramming.
After repairs, clear codes and perform full function test and road or ambient light cycle test to confirm the fault does not return.

Likely causes

Fuse blown or contact fault
Broken wire or pinched harness between BCM and lamp
Corroded connector at lamp or inline splice
LED lamp module internal failure
BCM driver transistor fault or internal short

Fault status

⚠️ Status

Presence light - Power supply B: Voltage/circuit fault detected (open, short, or out-of-range supply)

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

Repair manuals

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B13C8 — Presence light - Power supply B