P1348

Code

LAND ROVER P — Powertrain

Sensor B of fuel level - low circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 13 EN: 90 RU: 19

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Page language: EN

Causes

Broken, shorted or corroded wiring harness or connector for fuel level sensor B
Poor ground at the fuel sender or module
Failed fuel level sender (float/potentiometer) in the tank or fuel module
Faulty instrument cluster or body control module input for sensor B
Intermittent connection due to vibration or damaged connector
Aftermarket modifications or recent service work left connector loose

Symptoms

Fuel gauge reads empty or much lower than actual fuel level
Inaccurate range/vehicle mileage-to-empty calculations
Fuel level warning or message displayed
Intermittent or permanent loss of fuel level B reading (may affect instruments/BCM)

What to check

Read and record freeze frame/related codes and monitor fuel level sensor B live data with a diagnostic scanner
Visually inspect fuel tank area, connectors and wiring for damage, corrosion or chafing
Check connector pins for corrosion, bent pins or poor contact at the sender and at the harness/ECM
Measure reference voltage and ground at the sender connector with key ON (reference typically provided by BCM/ECM)
Measure signal voltage/resistance of the sender while moving float (or by hand if accessible) to observe change
Wiggle test wiring while observing live data for intermittent faults

Signal parameters

Typical variable signal: approximately 0.5–4.5 V across sender range (vehicle-specific — consult factory data)
Low-circuit indication: signal voltage near 0 V or below manufacturer threshold
Resistance-type senders: expect variable resistance across float travel (often tens to hundreds of ohms; consult factory spec)
Open-circuit: infinite resistance or no signal change when moving float
Short to ground: continuity between signal wire and chassis ground

Diagnostic algorithm

Retrieve all stored codes and note freeze frame data. Confirm code P1348 is present and whether it is current or history.
With key ON (engine off), monitor live fuel level sensor B data using a Land Rover–capable scan tool. Note voltage/reading and whether it changes when fuel level changes (if safe to do).
Visually inspect and repair any damaged wiring or connectors at the fuel module, harness routing, and body control module/ECM connector. Unplug connectors and inspect pins for corrosion or damage.
Check for proper reference voltage and ground at the sender connector. If reference voltage missing, trace back to BCM/ECM and check related fuses/relays.
Measure signal wire for continuity to the module; check for short to ground or battery. Backprobe the connector and compare to expected voltage/resistance values.
If wiring and power/ground are good but signal is incorrect or does not change with float movement, remove/inspect the fuel module/sender assembly per OEM procedure and bench-test the sender. Replace sender/module if faulty.
If sender tests good, test the module input at the BCM/ECM for proper operation. Repair or replace BCM/ECM only after eliminating wiring and sender faults.
After any repair, clear codes, perform relearn/initialization if required by manufacturer, and verify operation by rechecking live data and road/test conditions.

Likely causes

Corroded/loose connector at the fuel tank module or wiring chafe
Internal failure of the sender potentiometer (stuck at low output)
Short to ground on the sensor signal wire
Failed module input (rare compared with wiring/sender failure)

Fault status

⚠️ Status

P1348 — Sensor B of fuel level: low circuit detected. The control module has detected a fuel level B signal below the expected threshold.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5 - 2.0 hours

Repair manuals

Manual library for LAND ROVER

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Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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P1348 — Sensor B of fuel level - low circuit