Key Fob Repair and Replacement in Solihull

Why has my car key fob stopped working?

A key fob that has stopped working usually fails for one of five reasons, and the diagnosis follows that order. A flat battery is the most common cause, and it shows as a fob that works only at close range or not at all. Worn buttons come next, where the fob works when pressed hard in one spot and fails elsewhere. A damaged shell lets moisture in, a failed chip stops the immobiliser recognising the key, and a fob that has lost its programming needs pairing again.

The locksmith works through that ladder at the car, starting with the simplest cause and moving to the more serious ones, so a driver is not sold a new fob for a fault a battery would fix. The fault is explained before any work starts, and the price is agreed on the call and confirmed again at the car if the diagnosis changes. No work starts on a price you have not accepted.

• Flat battery: the fob works only at close range, or not at all.
• Worn buttons: the fob works when pressed hard in one spot.
• Damaged shell: moisture reaches the chip inside the fob.
• Failed chip: the immobiliser no longer recognises the key.
• Lost programming: the fob needs pairing with the car again.

Car key fob battery replacement in Solihull

A flat fob battery is a legitimate owner task, and it is worth trying before calling a locksmith. A fob that has gone weak, works only beside the car, or stops responding altogether often needs nothing more than a fresh coin battery, and the fob returns to normal once the battery is changed. The battery type is printed inside the fob case, and a new battery costs little from a shop.

Open the fob case with care, because forcing the case can damage the buttons or the chip inside, and a damaged fob costs more to fix than a battery. If a new battery does not fix the fob, the fault lies in the fob or its programming, and that is the point to call the locksmith on 07367 634032. A battery change is not sold as a callout service, and the locksmith will say so plainly on the call.

Car key fob shell and button repair

A fob shell takes daily punishment: it is dropped, sat on, squeezed in pockets, and soaked in rain, and the case cracks while the buttons wear smooth. A shell replacement moves the chip and the blade into a new case, and worn buttons are replaced at the same time, so the fob looks and feels new without the cost of a full replacement. The chip itself is untouched, so no new programming is needed for a shell-only repair.

Shell and button repairs suit fobs where the electronics still work and only the case has failed. The locksmith checks the chip and the buttons at the car before deciding, because a shell repair cannot fix a failed chip, and honesty about that saves a wasted visit. If the chip has failed, the fob needs replacing instead, and the next section explains that decision.

When does a car key fob need replacing instead of repairing?

A fob needs replacing when the electronics inside have failed, rather than the case around them. Water damage is the most common cause: a fob dropped in a puddle or left in a wet pocket can corrode the circuit board beyond repair, and no battery change will bring it back. A failed chip is the second cause, where the immobiliser no longer recognises the key at all, and a smart or proximity key with a sealed unit often cannot be opened for repair.

A replacement fob is shaped and coded beside the car, using details read off the vehicle, and ownership documents are checked before it is made, namely the V5C logbook and photo ID. The new fob is tried with you, including the remote locking and the push-button start where fitted. The proof of ownership page lays out the documents, and the prices page explains the factors that shape the cost.

Car key fob security and relay attack protection

A keyless fob carries a security risk that a standard key does not: the signal it sends can be copied by a relay attack, where the signal from a fob inside the house is relayed to the car outside. The protection is simple and cheap: keep the fob in a Faraday pouch at home, which blocks the signal, and keep the fob away from doors and windows. This page describes the risk and the protection, and never describes how to perform a relay attack.

If a fob has been cloned or copied without your knowledge, the signs include the car unlocking itself, the alarm sounding without cause, or a key that works when it should not. Report any suspected cloning to the police, and call the locksmith for advice on the next step. The links below lead to vehicle security standards and to fraud reporting guidance.

• Thatcham Research — vehicle security standards
• Sold Secure — lock and key security
• Action Fraud — report key cloning and vehicle fraud