Faulty fuel level sender (worn track, failed float or internal short) in the fuel tank unit; Signal wire shorted to earth, for example chafed loom near the tank or under the rear seat or boot floor; Corroded or damaged connector at the fuel pump and sender module or in the boot area; Water ingress or contamination affecting the sender wiring or connector; Poor earth or reference supply to the sender circuit; Fault in the control unit or instrument cluster input.

P1199

Fuel Level Input Circuit Low.

Jaguar
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
1: AreaFuel and air metering
99: FaultThe specific fault in that area

What it means

On a Jaguar, P1199 means the control unit has detected a low voltage signal from the fuel level input circuit. The module saw the fuel level sender signal fall below its expected range, which points to a short to earth, a fault in the sender or a wiring problem. Exact circuit layout and which module reads the signal depend on the model and year.

Symptoms

Fuel gauge reads empty or drops to zero
Low fuel warning light or message showing with fuel in the tank
Fuel gauge reading erratic or stuck
Malfunction indicator lamp on
Inaccurate range or fuel remaining display

Possible causes

Faulty fuel level sender (worn track, failed float or internal short) in the fuel tank unitlikely
Signal wire shorted to earth, for example chafed loom near the tank or under the rear seat or boot floorlikely
Corroded or damaged connector at the fuel pump and sender module or in the boot areapossible
Water ingress or contamination affecting the sender wiring or connectorpossible
Poor earth or reference supply to the sender circuitpossible
Fault in the control unit or instrument cluster inputrare

How to diagnose

Read all stored codes and freeze frame data, and note whether other fuel system or instrument cluster faults are present
Compare the gauge reading with the actual amount of fuel in the tank and see if the reading changes after refuelling
Check live data for fuel level, if available, and see whether it reads at the minimum or is stuck
Inspect the wiring and connectors from the fuel tank sender to the control unit for chafing, corrosion, water and damaged pins
Check the sender circuit for a short to earth with the connector unplugged, following the model wiring diagram
Check the supply, signal and earth at the sender connector against the manufacturer specification for your model
Measure the sender resistance across its range and compare it with the specification for your model
Clear the code after repair and road test to confirm it does not return

How to fix

Replace the fuel level sender or fuel tank unit if its readings are out of specification
Repair or replace damaged wiring that is shorted to earth
Clean, repair or replace corroded or damaged connectors and terminals
Repair earth or supply faults in the sender circuit
Dry out and seal any area with water ingress, and fix the source of the leak
Replace or repair the control unit or cluster only after wiring and sender faults are ruled out

Can I keep driving?

Low severity

The car is usually safe to drive, but the fuel gauge may be unreliable, so track mileage and refuel by distance to avoid running out. Book it in soon to restore an accurate reading.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.