P131A

Code

LAND ROVER P — Powertrain

Low fuel level detection

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 14 EN: 12 RU: 14

AI status

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Page language: EN

Causes

Actual low fuel level in tank
Faulty fuel level sender (float/potentiometer) in the fuel pump module
Corroded, damaged or disconnected wiring/connectors between sender and ECU
Poor ground at sender or instrument cluster
Intermittent float sticking (debris, tank corrosion)
Fuel tank module or integrated sensor module fault

Symptoms

Low fuel warning light or message illuminated
Fuel gauge showing empty or incorrect level
Stored P131A fault in ECM/BCM and possible history of intermittent events
Inconsistent or jumping fuel level readings
No other drivability symptoms in many cases

What to check

Scan vehicle and read freeze frame, pending and stored codes; record fuel level PID and timestamp
Visually confirm actual fuel level (refill to a known amount if necessary)
Inspect connectors at the fuel pump/fuel tank module and instrument cluster for corrosion, water ingress, bent pins or loose clips
Use scan tool to monitor live fuel level PID while moving vehicle or gently manipulating fuel tank area to reproduce changes
Measure sender signal voltage/resistance at the harness with ignition ON and compare values as the tank level/float is moved (observe manufacturer service data if available)
Check continuity to ground and supply voltage to the sender circuit; check related fuses and grounds

Signal parameters

Fuel level PID: 0–100% (should change smoothly with actual level)
Fuel level sender voltage: typically varies (commonly in the ~0.5–4.5 V range) as float moves — should not be open/shorted or fixed
Sender resistance: varies with float position (no open circuit and no short to ground/12V)
Scan-tool live data: no large jumps or frozen values during ignition cycles or gentle tank movement

Diagnostic algorithm

Verify safety: work in ventilated area and avoid open flames/sparks near fuel tank.
Using a scan tool, confirm P131A is present and record live fuel level PID and any freeze-frame data.
Visually confirm actual fuel level. If tank is empty, refill to a usable level and re-check code; some systems set low-level codes with legitimately low fuel.
Inspect external connectors and wiring to the fuel pump/module and instrument cluster for damage, corrosion or looseness; repair as needed.
With ignition ON (engine off), monitor sender signal with a scan tool while an assistant gently rocks vehicle or while tank level is changed (if possible) to look for movement in PID.
Backprobe connector at fuel pump/module and measure signal voltage and resistance through harness while operating the float (if accessible) or lift/remove pump per service manual. Compare to expected behavior (should vary smoothly, no open/short).
Check supply voltage and ground at the sender connector; repair any poor ground or supply issues.
If wiring and connectors test OK but signal is erratic/stuck, remove and inspect fuel pump module and sender float for damage, sticking, or contamination; replace module or sender assembly if faulty.
After repairs or replacements, clear codes, confirm proper live fuel level readings, perform drive or soak cycles to ensure code does not return.
If problem persists and wiring/module are good, check for ECU/BCM updates or intermittent module faults and consider module replacement only after other items are ruled out.

Likely causes

Empty or near-empty fuel tank (simple, often overlooked)
Failed/stuck sender float or worn potentiometer
Open or short in sender circuit or poor connector/ground
Contaminants or foam in tank interfering with float movement
Faulty fuel pump assembly with integrated level sensor

Fault status

⚠️ Status

Low fuel level detection fault — fuel level signal out of expected range or indicates low fuel; stored when fuel level/sensor circuit validation fails.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours

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