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Home / DTC / P115B — Low fuel level - forced engine shutdown Compensation of the mass airflow circuit of the control box fan

P115B — Low fuel level - forced engine shutdown Compensation of the mass airflow circuit of the control box fan

Detailed page for trouble code P115B.

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Code

P115B

LAND ROVER P — Powertrain

Low fuel level - forced engine shutdown Compensation of the mass airflow circuit of the control box fan

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Very low fuel tank level or fuel starvation
  • Faulty fuel level sensor / sender or incorrect sender resistance
  • Intermittent or open/short in wiring to fuel level sender or fuel pump
  • Weak or failed fuel pump causing low fuel pressure when tank low
  • MAF sensor signal out of range or erroneous leading to compensation
  • Fan control circuit fault affecting intake/airflow compensation logic

Symptoms

  • Low fuel warning illuminated or inaccurate fuel gauge reading
  • Engine limp mode, reduced power or forced engine shutdown when running low on fuel
  • Intermittent stalling or no-start after extended low fuel operation
  • Check Engine Light (MIL) illuminated
  • Unusual MAF readings in live data (very low/high airflow or erratic values)
  • Cooling fan operation oddities or fan not operating when expected

What to check

  • Read stored and pending codes and freeze frame data with a capable scan tool
  • Verify actual fuel level visually or with a calibrated gauge
  • Check fuel pressure at the rail at key-on and during cranking/idle
  • Inspect fuel tank sender connector, wiring, and ground for damage/corrosion
  • Monitor live data: fuel tank level/sender resistance, fuel pump command, fuel pressure, MAF voltage/frequency, fan command and fan speed
  • Check for intermittent faults by wiggle-testing wiring and connectors while observing live data

Signal parameters

  • Fuel level sender resistance or percentage (% tank level) — expected range varies by model
  • Fuel rail pressure (bar / psi) — key-on, cranking, idle and under load
  • MAF sensor airflow (g/s) or voltage/frequency — steady values appropriate to rpm and load
  • Fan control command (on/off or PWM %) and measured fan speed/current
  • Fuel pump command (duty cycle / relay state) and pump supply voltage
  • Ground circuit continuity and connector voltage reference (key-on 12V)

Diagnostic algorithm

  1. Retrieve all manufacturer-specific codes and freeze frame data. Note conditions when P115B set (fuel level, rpm, temperature).
  2. Confirm actual fuel quantity. If tank was very low, refill and clear the code then re-check operation and re-run readiness/drive cycle.
  3. Inspect fuel sender and pump module connectors for corrosion, water intrusion or loose terminals. Repair as needed.
  4. Measure fuel level sender resistance vs specification while moving the float; verify gauge cluster/ECU values match physical level.
  5. Check fuel pressure and pump operation at low tank conditions (if safe). Replace or repair pump or filter if pressure is unacceptable.
  6. Scan live data for MAF sensor signals and fan control parameters. Clean or replace MAF if contaminated, and repair wiring if signals are erratic.
  7. Test fan control circuit: check relay, fuse, wiring and ECU outputs; verify fan runs when commanded and that current draw is within spec.
  8. Perform wiring continuity and resistance checks between modules (fuel tank module, MAF, fan control, ECU).
  9. Clear codes, perform a road test under the same conditions that caused the fault to verify repair. If intermittent, use data logger to capture occurrence.
  10. If wiring and components check out, consult latest Land Rover technical service information for ECU software updates or known issues and perform reflash if required.

Likely causes

  • Fuel level sender failure or float stuck at low reading
  • Low fuel in tank combined with marginal fuel pump causing momentary cutoff
  • Damaged wiring or poor ground to fuel tank module
  • MAF sensor contamination or failure triggering compensation logic
  • Faulty fan control relay/module causing airflow compensation to be commanded
  • Corroded connector at the fuel pump module or MAF harness

Fault status

⚠️ Status
Manufacturer-specific: Low fuel level detected — forced engine shutdown / MAF circuit compensation for fan control
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

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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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