Your 370Z or G37 Won't Start and the Button Says LOCK: The Steering Lock Failure, Explained

If your Nissan 370Z or Infiniti G37 suddenly will not start — the push button shows LOCK or does nothing, an orange KEY warning light glows on the dash, and the car will not even cycle into accessory mode despite a healthy battery — the most likely culprit is the electronic steering column lock, a small motorised module bolted to the steering column. When it fails in the locked position, the car's security system never receives the "steering unlocked" signal it requires before authorising a start, so a perfectly good car is stranded by a part that has nothing to do with the engine. Owners of early cars have a famous preventive fix — pulling the steering lock fuse while the car still works — but once the module has failed, that same fuse pull usually does nothing, and recovery gets more involved.

What the Steering Lock Actually Does

The electronic steering column lock (owners shorten it to ESCL) is an anti-theft device: a motor-driven pin that physically locks the steering column when the car is off and retracts when you press the start button with a valid key nearby. The important part for diagnosis is the handshake. The car does not simply power the starter when you press the button — it first asks the lock module to retract and report back. If the module's motor or internal switches fail, the report never comes, the button stays at LOCK, accessory mode is unavailable, and the key light complains. That is why the classic symptoms are electrical silence rather than a struggling crank: no ACC, no crank, sometimes a steering wheel that stays locked, and a car that behaves as if it does not recognise a key it recognised yesterday.

Step One: Rule Out the Simple Causes First

Owners in thread after thread started where you should: the key fob battery and the car's 12-volt battery. A weak fob battery or a genuinely flat 12-volt battery can produce key warnings and a dead button, and both are cheap to eliminate — try the spare fob, hold the fob against the start button as the manual describes for a weak fob battery, and test or charge the car battery before condemning anything. The steering lock moves to the top of the suspect list when the battery is verified good, the fob battery is fresh, and the car still will not leave LOCK or enter ACC. Several owners were misled at exactly this point, replacing fob batteries to no effect before finding the real cause. A starter motor, by contrast, almost never prevents accessory mode — if you cannot get ACC, think security handshake, not starter.

Which Years? Owners Disagree — Treat 2009–2012 as the Risk Zone

Ask owners which cars are at risk and you get an argument, so here is the honest version. The failures reported most often involve 2009–2012 cars, and one widely linked discussion of the Nissan technical service bulletin puts the affected production run ending around mid-July 2011 — which would catch some early model-year 2012 cars built in 2011. Other owners insist the problem was fixed for 2011 and up; others still report failures on 2011 cars at modest mileage, a stranded 2012, and even a 2014 car whose symptoms returned hours after a fuse pull. The practical takeaway does not depend on resolving the argument: if your 370Z or G37 is from the early years and still locks its column, treat it as at risk; if it is newer, the failure is less common but not unheard of. Owners also disagree on whether the factory response was a recall or only a service bulletin — not the same thing — so check your own car's status rather than assuming coverage.

The Preventive Fix: Pull the Fuse While the Car Still Works

The single most repeated piece of owner advice is preventive: while the car still starts normally, put it in accessory or ON mode with the steering unlocked, then remove the steering lock fuse — a 10-amp fuse in the engine-bay fuse box by the battery — so the module can never be powered to engage again. Owners who did this report it as a short, free job, and the logic is sound: a module that never receives power cannot fail in the locked position. Two honest caveats come with it. First, the trade-off: your steering will no longer lock when the car is parked, which is an anti-theft feature you are choosing to give up. Second, timing is everything — owners are emphatic that the fuse must come out with the lock retracted and the car in ACC or ON. Pulling it at the wrong moment, or after the module has already failed, does not produce the same result.

Already Stranded? Why the Fuse Alone Won't Save You

Once the module has failed locked, most owners find the fuse pull does nothing, because the problem is no longer power — it is the missing "unlocked" report. The recovery methods owners describe all aim at the same goal: coax the module into reporting unlocked one more time, get the car into ACC, and then pull the fuse so it can never lock again. The reported methods, in escalating order, are: firmly tapping the aluminium module housing on the column while pressing the start button, which some owners say frees a stuck mechanism (others report it did nothing); temporarily grounding the module's signal wire to bodywork to simulate the unlocked state long enough to reach ACC and pull the fuse — a method owners describe inconsistently, with different wire identifications, and with a firm warning that the ground is temporary only, because leaving it attached upsets the security system; and removing the module, opening it, and manually moving the lock to the open position before reinstalling and pulling the fuse. Treat the wiring methods as locksmith-or-professional territory: the threads themselves contain conflicting instructions, one owner's fuse-without-grounding attempt created new key fob faults, and this is the car's anti-theft system you are persuading. A tow to someone who knows this failure is money better spent than experimenting blind.

Replacement, Bypasses and Emulators: The Traps

The straightforward fix is a new module, and owners' reported costs vary wildly — all of these are owner anecdotes, not quotes: dealer figures reported in the threads run from about $1,580 for a 2011 car to $2,200 for a 2010 G37, with one owner quoted $1,700 for the genuine part alone before labour, and another reporting a workshop change plus key remapping for about $600. DIY replacement is possible but the module is mounted with shear bolts whose heads snap off by design, so removal means carefully drilling them out, and a replacement may need key matching or programming depending on the car and the part. Cheap bypasses and emulator modules exist and are the biggest trap in the threads: an owner who fitted an emulator found the car still locked, because the unit needed key matching and activation despite plug-and-play advertising, and another owner was told at a key-programming appointment that their bypass had to come out and a real lock fitted before keys could be reprogrammed. Several owners also warn that a dealer replacement may be the same failure-prone design — which is why so many, after any fix, pull the fuse anyway.

The Mistakes to Avoid

Do not keep driving a car that has shown early symptoms — intermittent key lights or occasional LOCK behaviour — hoping it clears; owners were stranded at work, at fuel stations and a long way from home. Do not replace the starter or battery repeatedly when accessory mode itself is unavailable. Do not pull the fuse after failure and declare the method useless; it is a preventive, not a cure. Do not leave a temporary ground attached. And if your car is in the risk years and still healthy, do not wait: the preventive fuse pull, done correctly while everything works, is the cheapest insurance in this entire story. For the other famous way a 370Z or G37 clutch pedal strands its owner, see our CSC failure guide, and for the quiet engine problem on the same cars, our gallery gasket guide.