Code
B145E
LAND ROVER
B — Body
Proximity sensor power supply - Circuit 2 Trunk control module circuit 2
Views:
UK: 2
EN: 3
RU: 0
AI status
Completed
Completed
100%
Causes
- Open or short in proximity sensor power supply wiring (circuit 2)
- Poor or corroded connector at the sensor or trunk control module
- Failed proximity sensor (internal short/open)
- Faulty trunk control module (TCM) power driver or circuit
- Blown fuse or faulty fuse connection supplying the module/sensor
- Water ingress or physical damage to sensor or wiring
Symptoms
- Trunk proximity sensor 2 not responding or erratic
- Trunk open/close functions unreliable or not working
- DTC B145E stored and possible accompanying warning messages
- Intermittent trunk operation when moving/handling harness
- Other trunk accessories behaving abnormally (lighting, latches)
What to check
- Read stored codes and freeze-frame data with a compatible scan tool
- Visually inspect sensor, wiring harness, grommets and connectors for damage or water
- Check relevant fuses and power distribution for the trunk control module
- Backprobe sensor connector and trunk control module connector for supply and ground with key ON
- Perform wiggle/strain test on harness to reproduce fault
- Disconnect sensor to see if code changes (isolate sensor vs module)
Signal parameters
- Reference/power supply to proximity sensor (typical): ~5 V reference or as specified by OEM — verify with wiring diagram
- Battery system voltage with engine OFF/ON: ~11–14 V
- Expected continuity: supply circuit should not be open; resistance to ground should be low where applicable
- No short to ground or short to battery positive on the sensor supply circuit
Diagnostic algorithm
- Retrieve DTCs and any related codes; record freeze-frame data.
- Visually inspect sensor 2, connector, harness routing near trunk and liftgate for damage, corrosion or water entry.
- Verify fuses and power feeds to trunk control module; repair any blown/loose fuses.
- With ignition ON, backprobe the sensor 2 power pin and measure supply voltage. Compare to OEM expected value from wiring diagram.
- Check sensor ground continuity to chassis ground; measure voltage drop while operating or wiggling harness.
- Check for short to ground or short to battery: measure resistance from supply pin to ground and to battery positive with battery disconnected.
- Disconnect sensor 2 and clear codes. If code does not return, suspect the sensor or its immediate wiring/connector; if code returns with sensor disconnected, suspect wiring or trunk control module.
- If wiring and connectors test good, substitute a known-good sensor (if available) or repair/replace sensor and retest.
- If problem persists after sensor and wiring repair, inspect/replace trunk control module or have module bench-tested; check for software updates or TSBs before replacement.
- After repair, clear codes and perform function test and road/operation verification to ensure code does not return.
Likely causes
- Damaged/shorted wiring or pin-stressed connector at trunk area (most common)
- Corroded/contaminated connector causing intermittent supply
- Failed proximity sensor on circuit 2
- Faulty trunk control module driver or internal fault (less common)
Fault status
Status
Trunk control module detected fault on proximity sensor power supply circuit 2 — open/short/low supply or intermittent connection.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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