B2190 on Infiniti: How to Diagnose & Fix
Manufacturer-Specific Body Code (definition varies: anti-theft antenna / window switch circuit)
1 Infiniti model · 1 documented issue · 1 critical · $600-$1,800 repair
B2190 on Infiniti by model: symptoms, diagnosis and fix
Infiniti/Nissan vehicles using the electronic steering column lock system have a well-documented failure mode where the vehicle will not recognize the lock state, leaving the car unable to start even though the battery and key fob appear normal. The issue is widely discussed across Nissan/Infiniti owner communities and tied to the steering lock control unit used on related FM-platform vehicles. Owners typically report a sudden no-start with the steering wheel locked or the ignition staying in ACC/ON behavior without cranking.
Common Symptoms
- push-button start does nothing
- vehicle stuck in ACC or ON mode
- steering remains locked
- intelligent key warning
- intermittent no-start that becomes permanent
How to Fix
Confirm battery voltage and key fob operation first, then scan BCM/IPDM/steering lock modules for communication or lock-status faults. Repair usually involves replacing or bypassing the failed electronic steering lock assembly depending on model applicability and local repair practice, followed by key/immobilizer relearn if required. Because symptoms mimic a weak battery or bad brake switch, proper diagnosis is important before replacing parts.
Owner tips & cautions
- TipBefore condemning the steering lock, verify the 12V battery is fully charged and load-tested; low voltage can trigger misleading intelligent-key and lock errors.
- TipIf the vehicle intermittently fails to start, scan BCM and immobilizer modules immediately while the fault is active; stored history can disappear after battery disconnects.
Sources for this issue (1)
B2190 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B2190 mean on a Infiniti?
B2190 stands for "Manufacturer-Specific Body Code (definition varies: anti-theft antenna / window switch circuit)." B2190 is a manufacturer-specific body code, so its meaning varies by maker. On Nissan/Infiniti it commonly relates to the NATS (anti-theft) antenna amplifier circuit, while on GM vehicles it has been associated with a window or seat switch circuit fault. In general it points to a body-control-module input or convenience/security circuit that is out of range or open/shorted. The exact component must be confirmed against the specific vehicle's service information. On Infiniti it is documented across 1 model: QX50.
What are the most common causes of B2190?
The most common causes of B2190 are: Faulty anti-theft (immobilizer) antenna or amplifier (Nissan/Infiniti), Damaged or open switch circuit wiring, Corroded or loose connector at the body control module, Failed switch or input component, Short to power or ground in the affected circuit, Body control module fault. The specific cause varies by vehicle.
How much does it cost to fix B2190 on a Infiniti?
Published repair estimates on Infiniti range from $600 to $1,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for B2190 on a different make?
View B2190 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.