Auto Locksmith Service Call and Diagnostic Fees in Keller TX (2026)

Almost every article about automotive locksmith pricing tells you what a key costs. Very few tell you what you pay before anybody touches the key, and that is the part people actually get surprised by. This page covers the fees that exist before the work: the service call, the diagnostic, the after-hours surcharge, and what happens to your bill when the problem turns out not to be a key at all. These are the real 2026 numbers for Keller, Southlake, Colleyville, Bedford, Grapevine and the rest of north Tarrant County. Call or text (817) 968-3866.

Quick Answer

As of August 2026, a mobile automotive locksmith call in the Keller area typically carries a service call fee of $45 to $95, which in most cases is folded into the job total rather than charged on top of it. Diagnosis runs $0 to $150 depending on complexity, and it is usually credited against the repair if you go ahead. An after-hours surcharge of around $100 applies outside normal business hours and should be included in the first total you are quoted, not added at the end. Bringing a drivable vehicle to the shop removes the mobile fee entirely. A typical straightforward key job in normal hours lands between $120 and $450 all in.

Pricing

Ranges only, as of August 2026.

Fee	Typical range	When it applies
Mobile service call fee	$45–$95	Any at-your-location visit; usually rolled into the job total
In-shop service call fee	$0	You drive the vehicle to the Arlington shop
Basic key or lock diagnosis	$0–$95	Applied to the repair if you proceed
Electrical and module diagnosis	$60–$150	Applied to the repair if you proceed
Immobilizer diagnosis	$60–$150	Applied to the repair if you proceed
After-hours surcharge	~$100	Outside normal business hours; quoted up front, never added later
Second vehicle at the same address, same visit	$0 additional call fee	Fleet, family, or two cars in one driveway

The Service Call Fee, Explained Honestly

A mobile service call fee is not padding. It pays for a van full of key blanks, cutting equipment, programming hardware and diagnostic tools driving to you, and for the technician's time getting there.

Here is the part worth understanding: in most cases it does not appear as a separate line you pay twice. When you book a key replacement and the job goes ahead, the fee is absorbed into the total you were quoted. Where it genuinely becomes a standalone charge is when someone drives out and no work happens, either because the customer changes their mind or because the situation turns out to be something we cannot help with.

That is also why we ask so many questions on the phone. Every question is an attempt to make sure the van that leaves is carrying the right parts and that the job is actually one we can do. A five-minute phone call is cheaper for you than a wasted trip.

The single cheapest thing you can do about this fee is drive the car to us. If your vehicle still starts and drives, in-shop work carries no mobile fee at all. You pay the service price. For a spare key that you are getting made proactively rather than in an emergency, that is almost always the right call. The case for doing it before you need it is in why you should cut a second key before you lose the first.

The Diagnostic Fee, and Why It Exists

There are two kinds of automotive locksmith job. In the first kind, you know what you need: a spare key, a duplicate, a fob. There is nothing to diagnose. Nobody should be charging you a diagnostic fee to cut a second key for a car that runs fine.

The second kind is a car that will not start, will not turn, will not respond, or is behaving strangely. That job begins with figuring out what is actually wrong, and that work has real value even when it ends with us telling you the answer is not a locksmith problem.

Basic key and lock diagnosis is often free or nominal and always credited to the repair. Electrical, module and immobilizer diagnosis runs $60 to $150 because it involves scan equipment, voltage testing and time.

Why we charge for it rather than guessing: the alternative is selling you a part you did not need. We have seen plenty of vehicles arrive at us after someone else replaced an ignition cylinder on a car whose actual fault was a $30 battery terminal. Twenty minutes of honest diagnosis is cheaper than a $500 wrong repair.

When the diagnostic fee is waived: it is credited against the repair on essentially every job we go on to perform. If you call us out, we diagnose, and you approve the fix, you do not pay for the diagnosis separately.

When the Answer Is "This Is Not a Key Problem"

This is the scenario that most articles skip, and it is where the honesty of a shop actually shows.

Roughly a third of the no-start calls we take turn out not to be key faults. The realistic list: a weak or dead 12-volt battery, a corroded battery terminal, a starter, a brake switch on a push-button car, a security or anti-theft system holding the vehicle down, or a control module that has failed or was replaced without being programmed to the vehicle.

That last category matters here because it changes the shape of the bill. A car whose engine cranks strongly but never fires, with a security light behaving oddly, is usually an immobilizer or module conversation rather than a key conversation. Depending on which module, that work runs from $90 for an adaptive relearn to $600 or more for full coding on a difficult platform. Our overview of what car computer module programming actually involves explains why those numbers spread so far apart, and if the fault sits on the transmission side there is a dedicated page on automatic transmission control module programming.

The other frequent version of this is a vehicle that locked itself out electronically after a battery event. That is an immobilizer state problem, not a broken key, and the fix is a relearn rather than a new key. We cover the specifics in immobilizer reset after a dead battery or module event.

What we do when the answer is not us. We tell you, we charge the diagnostic, and we do not sell you a key you do not need. If the vehicle needs a mechanic, a battery or a dealer-only procedure, that is what we say. It is a worse day for our invoice and a much better one for yours.

The After-Hours Surcharge

Outside normal business hours, an after-hours surcharge of around $100 applies. There are two things worth knowing about it.

First, it goes in the first number. If you call us at 10 PM, the total we quote you on the phone already includes it. We will name it so you know it is there, but you will not agree to $295 and then be handed a $395 invoice at the end. A quote that grows after the work is done is the single most common complaint people have about emergency locksmith service, and it is entirely avoidable.

Second, it is sometimes avoidable for you. If your situation can wait until morning, say so. A spare key, a worn ignition that still works, a fob that is failing intermittently — none of those need a night call. Booking first thing the next morning removes the surcharge from the total. If you are locked out or genuinely stranded, that is a different conversation and the surcharge is the cost of somebody being available at 2 AM.

Real Examples of How the Fees Stack

Numbers below are typical ranges, not quotes, and assume the Keller and north Tarrant County area as of August 2026.

A spare smart key, booked ahead, driven to the shop. No mobile fee. No diagnosis. You pay the key and programming. This is the cheapest version of every key job that exists, and it is available to anyone whose car still runs.

A spare smart key, mobile, at your house in Colleyville, Tuesday afternoon. Service call fee absorbed into the total. No diagnosis needed. No after-hours. You pay a modestly higher all-in figure than the shop version.

A car that will not start, mobile, Tuesday afternoon in Bedford. Service call plus diagnosis. If the fault is a key or immobilizer issue we can fix, the diagnosis is credited and you pay the repair. If it is a dead battery, you pay the diagnostic and we tell you what it is.

A total lockout with all keys lost, 11 PM, parking lot in Grapevine. Service call, after-hours surcharge, all-keys-lost origination and programming, all in the first quoted number. This is the most expensive combination available and it is why the spare-key argument is worth taking seriously before the emergency. The full picture on that job is in our guide to all keys lost and the VIN-to-new-key process.

Questions Worth Asking Any Locksmith Before They Drive Out

Not just us. Ask these of anybody you call:

1. What is the all-in total, including any call fee and after-hours charge? A shop that will not give you a total range over the phone with the year, make and model in hand is one to be cautious about.
2. Is the diagnostic credited if I approve the repair? It should be.
3. What happens to the fee if you cannot fix it? A straight answer here tells you a lot.
4. Is the price different if I bring the car to you? It should be, and by a meaningful amount.
5. Are you cutting the key to the vehicle's code or copying my existing key? Copying a worn key reproduces the wear, which matters on older vehicles. The distinction is covered in transponder key cloning versus programming.

One more, less obvious: ask whether the part is OEM or aftermarket, and what the difference costs. Both are legitimate choices on most platforms and the price gap is real. The tradeoffs are laid out in our page on OEM versus aftermarket key fobs.

If you are weighing a locksmith against the dealer service department, the fee structures are genuinely different and neither is universally cheaper. That comparison lives in auto locksmith versus dealership for car key replacement. For quick answers to the things people ask us most often, there is also our common questions page.

What to Have Ready When You Call

Having these four things in front of you shortens the call and sharpens the quote:

• Year, make, model and trim. Trim matters more than people expect; two versions of the same model year can take completely different keys.
• Whether you have any working key. This is the single biggest price variable in the entire trade. One working key present is dramatically cheaper than all keys lost.
• Proof of ownership. Registration or title plus a matching photo ID. We check this on every key origination without exception, and it is not negotiable — it is the thing that stops your car being opened by somebody who is not you.
• Where the vehicle is, and whether it is drivable. A drivable car has cheaper options.

Frequently Asked Questions

How much does it cost for a locksmith to come out in Keller TX? The mobile service call fee typically runs $45 to $95 as of August 2026, and in most cases it is absorbed into the job total rather than charged on top. It becomes a standalone charge mainly when a technician drives out and no work ends up happening.

Do you charge a diagnostic fee? For straightforward jobs like a spare key, no — there is nothing to diagnose. For a no-start, a dead lock or an electrical fault, diagnosis runs $0 to $150 depending on complexity, and it is credited against the repair if you approve the work.

What if my problem turns out not to be the key? We tell you plainly and you pay the diagnostic rather than a key you do not need. Somewhere around a third of no-start calls turn out to be batteries, starters, brake switches or modules rather than keys.

Is there an extra charge at night or on weekends? Yes, an after-hours surcharge of around $100 outside normal business hours. It is included in the first total we quote you on the phone and never added afterward. If your situation can wait for morning, booking then removes it.

Is it cheaper to bring the car to you? Yes, meaningfully. In-shop work carries no mobile service fee. If the vehicle still drives and the job is not urgent, that is the cheapest version of the same work.

Do you charge separately for two cars at the same address? No. If we are already there, a second vehicle on the same visit does not carry another call fee. You pay for the work on each vehicle.

Get an All-In Number First

Tell us the year, make and model, whether you have a working key, and where the car is. We will give you a total that already includes any call fee and after-hours charge before anyone drives out.

Call or text Keller Locksmith at (817) 968-3866.

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Written by the Kellerlocksmith Automotive Locksmith Team. Fees are typical ranges for the Keller and north Tarrant County area as of August 2026 and are not quotes. Texas locksmiths are regulated by the Texas Department of Public Safety Private Security Program.