P1925

Code

LAND ROVER P — Powertrain

Fuel additive level - high circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 19 EN: 27 RU: 21

AI status

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Page language: EN

Causes

Short circuit to battery voltage on the additive level sensor signal wire
Faulty/additive level sensor (stuck or internally shorted)
Corroded, damaged or loose connector at the additive tank sensor
Wiring harness damage (chafing, pinched, water ingress)
Additive tank overfilled or sensor physically jammed
Body control module / ECU fault or incorrect software/calibration

Symptoms

Warning lamp or dashboard message indicating fuel additive level fault
Additive system disablement or reduced function (depending on model)
No drivability symptoms in some cases (electrical fault only)
Possible recurring fault after clearing codes if root cause not repaired

What to check

Read and record freeze frame and live data with a capable scan tool
Confirm the additive tank level is physically correct (inspect visually)
Inspect connector and wiring at additive level sensor for corrosion, damage, or moisture
Check related fuses and body control module power/ground circuits
Backprobe sensor signal and ground with the ignition on to measure voltage
Wiggle the harness while watching live data to check for intermittent faults

Signal parameters

Typical level-sensor signal: 0–5 V range (varies by design); 'high' condition commonly seen as >4.5 V or equal to battery voltage
Supply voltage to sensor circuit: ~12 V (when applicable) — verify is not present on the signal pin
Ground continuity: near 0 Ω from sensor ground to chassis ground
Resistance-based float sensors: expect a defined resistance range specified by manufacturer; open circuit or very high resistance indicates fault

Diagnostic algorithm

Connect a diagnostic scanner, read DTC P1925 and any related codes; record live data and freeze frame.
Visually inspect additive tank, sensor, connector, and wiring for obvious damage, contamination, or overfilling.
With ignition ON (engine off), backprobe the sensor connector: measure signal voltage, supply voltage and ground continuity. Compare to expected range. A signal at or near battery voltage indicates a short to power or internal short.
Perform a wiggle test on the wiring harness while observing the live signal for intermittent changes.
Disconnect the sensor and check signal wire for short to battery (probe between signal and battery +) and short to ground (signal to chassis ground). Repair any shorted wiring.
If wiring checks OK, test/replace the additive level sensor per manufacturer procedure. Re-test live data.
If sensor and wiring are good, inspect/replace body/control module connectors or consider module diagnostics per manufacturer service information.
After repairs, erase codes and perform a road test or system cycle to confirm the fault does not return.

Likely causes

Signal wire shorted to 12V or accessory power
Failed level sensor (internal electronics or float mechanism)
Connector pins corroded or pushed out
Ground open elsewhere causing abnormal voltage reading
Control module input damaged or intermittent

Fault status

⚠️ Status

Fuel additive level sensor circuit reports a high/overrange signal to the control module; internal/external short or sensor fault suspected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 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.

LAND ROVER

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P1925 — Fuel additive level - high circuit