Jaguar passive entry systems work at a detection zone of approximately one metre from each door handle antenna. If the keyless entry has stopped working at its normal range, or if you now have to stand much closer to the door for it to detect the key, there is usually a simple explanation.
Fob Battery Declining
The most common cause of reduced passive entry range is a fob battery beginning to decline. The key fob’s response signal to the vehicle’s antenna field weakens as the battery voltage drops. The first symptom is shorter detection range — you might need to be within 30 centimetres rather than the usual one metre. Eventually passive entry stops working entirely, but button presses still function. Replace the CR2032 battery. Passive entry range should return to normal immediately.
12V Vehicle Battery Low
If the 12V battery in the vehicle is low, the proximity antenna fields are weaker than normal. A weaker broadcast field has a shorter effective range. The key needs to be closer to the handle to reach the antenna field. If the vehicle has been standing unused for two or more weeks, this is worth checking.
Interference at a Specific Location
Some locations produce radio frequency interference at the frequencies Jaguar PEPS systems use. Multi-storey car parks, near broadcasting infrastructure, or close to certain industrial equipment. If the reduced range only occurs in one specific location and passive entry works normally elsewhere, this is environmental interference rather than a fob or vehicle fault.
Damaged Key Antenna
Physical damage to the fob’s internal antenna — from a drop, a crack in the case, or water exposure — can reduce the signal output. If a fresh battery and a move to a different location do not resolve the issue, the fob’s internal antenna may be damaged.
| Service | AJ Auto Price | Main Dealer Estimate |
|---|---|---|
| Jaguar spare key | From £180 | £400 to £900+ |
| Jaguar all keys lost | From £250 | £700 to £1,500+ |
For Jaguar key diagnosis and replacement see our Jaguar key not detected page and the Jaguar key replacement page.
Frequently Asked Questions
What is the normal detection range for Jaguar keyless entry?
Most Jaguar proximity entry systems detect a valid key within approximately one to two metres. Detection range can reduce with a weak fob battery, interference, or a vehicle security system configured to a tighter proximity setting.
Why does my Jaguar sometimes detect the key close but not at arm’s length?
A diminishing detection zone is one of the first signs of a key fob battery that needs replacing. The fob transmits a weaker signal as the battery drains, meaning the car only detects it when the key is very close rather than at normal arm’s length.
Can mobile phones or other electronics interfere with keyless entry range?
Yes. Mobile phones, some wireless chargers, and other devices that emit radio frequency signals can interfere with the low-frequency signals used by proximity entry systems. Moving the key away from electronic devices before approaching the car can confirm if interference is the cause.
What should I do if the detection range problem started suddenly rather than gradually?
A sudden rather than gradual reduction in range suggests an electronics fault rather than a battery issue. This warrants a diagnostic check to identify whether the fault is in the key, the vehicle antenna, or the proximity module.
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When to go to a dealer instead
If your vehicle is still under JLR factory warranty and the fault is covered, take it to a dealer. Warranty repairs are free and no specialist can match that. If you need a recall fix, the dealer is the right call. Outside of those two situations, a mobile JLR specialist will be faster, cheaper, and will attend at your location.