B1A78 on 2021-2024 Jeep Grand Wagoneer — Manufacturer-Specific Body/Security System Code
1 vehicles · 1 makes · $200-$1,800 repair
Most Reported On
B1A78 is an OBD-II diagnostic trouble code meaning “Manufacturer-Specific Body/Security System Code.” B1A78 is a manufacturer-specific body code in the security-systems range with no single standardized SAE definition. As with the other B1Axx codes, it generally relates to immobilizer, key/transponder, or security-module operation, but the exact meaning varies by automaker. The specific name and causes cannot be reliably stated without brand-specific documentation. Confirm with a make-appropriate scan tool. This code is most commonly reported on 2021-2024 Jeep Grand Wagoneer, with repair costs ranging from $200 to $1,800.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B1A78 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1A78 mean?
B1A78 stands for "Manufacturer-Specific Body/Security System Code." B1A78 is a manufacturer-specific body code in the security-systems range with no single standardized SAE definition. As with the other B1Axx codes, it generally relates to immobilizer, key/transponder, or security-module operation, but the exact meaning varies by automaker. The specific name and causes cannot be reliably stated without brand-specific documentation. Confirm with a make-appropriate scan tool.
What are the most common causes of B1A78?
The most common causes of B1A78 are: Immobilizer or anti-theft system fault, Key/transponder recognition problem, Security module communication error, Wiring or connector fault in the security circuit, Module configuration or software issue, Faulty body control / security module. The specific cause varies by vehicle.
How much does it cost to fix B1A78?
Repair costs for B1A78 range from $200 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by B1A78?
Au7o has documented B1A78 across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.