P1923

Code

LAND ROVER P — Powertrain

Fuel additive level - circuit range / performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 18 EN: 27 RU: 17

AI status

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Page language: EN

Causes

Low or empty additive reservoir
Faulty additive level sensor (float/resistive/PWM)
Open, shorted or corroded wiring or connector to the sensor
Poor ground or power supply to the sensor
Contaminated or mechanically jammed float in the reservoir
Faulty body control/module or ECM input circuit

Symptoms

Malfunction Indicator Lamp (MIL) / engine warning illuminated
Dash message indicating additive level or service additive required
Additive dosing or regeneration strategies inhibited or altered
Possible reduced engine performance or limp-home mode on some systems
Stored freeze-frame data and related codes

What to check

Read and record all stored codes and freeze-frame data with a suitable scan tool
Check additive reservoir level and visually inspect for contamination or foreign objects
Visually inspect sensor connector and wiring for corrosion, damage or water ingress
Backprobe sensor connector with key ON and measure reference voltage, signal and ground
Check for continuity and shorts to ground/power on the sensor harness
Perform wiggle test on harness while watching live sensor data for intermittent faults

Signal parameters

Typical sensor signal: 0–5.0 V DC (varies by design)
Expected idle/normal range: often ~0.5–4.5 V depending on float position (consult OEM spec)
Reference supply: usually 5 V or switched supply from control module
Signal type: analog voltage or resistive change (some systems may use PWM/frequency)

Diagnostic algorithm

Use a diagnostic scan tool to confirm P1923 and note freeze frame/live data. Clear codes and see if code returns. 2) Visually inspect the additive reservoir, sensor and connectors for contamination, corrosion, damage or loose fittings. Top up additive if low. 3) With key ON (engine off), backprobe the sensor connector: verify reference voltage, ground continuity and measure the sensor signal while moving the float (if accessible). Compare to OEM values. 4) If signal is out of range, inspect harness for open/shorts: perform continuity checks to module and check for shorts to power or ground. Repair any wiring faults. 5) If wiring and supply are good but signal incorrect, remove sensor and bench-test per manufacturer procedure (measure resistance or output vs float position). Replace sensor if out of specification. 6) After repair, clear codes, top-up additive if required, and perform required system relearn or regeneration procedure per manufacturer. Re-scan and road test to confirm repair. 7) If code persists, consider module input circuit fault and consult manufacturer diagnostic procedures for ECM/body control testing or perform module replacement only after thorough verification.

Likely causes

Contaminated or stuck float in additive reservoir
Corroded or loose connector at the level sensor
Failed level sensor element (electronic)
Broken or shorted wiring between sensor and control module

Fault status

⚠️ Status

P1923 — Fuel additive level sensor circuit range/performance. Check additive level, sensor, wiring and connectors.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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P1923 — Fuel additive level - circuit range / performance