B1A78 on Jeep
Manufacturer-Specific Body/Security System Code
B1A78 on Jeep vehicles indicates manufacturer-specific body/security system code. Au7o has documented this code across 1 Jeep model — most commonly on Grand Wagoneer. 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. Typical repair costs on Jeep range from $200 to $1,800, depending on the specific model and root cause.
Common Causes of B1A78
- •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
B1A78 on Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Second-Row Power Seat Memory Malfunction / Seat Fails to Return to Position2021-2024
The second-row captain's chairs equipped with power adjustment and memory functions on Grand Wagoneer L and standard models have been reported to fail to return to memorized positions or become entirely non-operational. The seat position memory module loses stored settings after a battery event, and the seat track actuator motors can bind in the rearmost position, blocking third-row access. Owner complaints on forums and NHTSA describe seats that move to a position and stop mid-travel, or refuse to respond to the Easy Entry function.
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View B1A78 across all makes →Frequently Asked Questions
What does B1A78 mean on Jeep?▼
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. On Jeep specifically, this code is documented across 1 model.
What causes B1A78 on Jeep vehicles?▼
Common causes on Jeep: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1A78 on a Jeep?▼
Repair costs on Jeep range from $200 to $1,800, depending on the specific model and root cause.
Which Jeep models have B1A78 documented?▼
Au7o has documented B1A78 on 1 Jeep model: Grand Wagoneer.