OBD2 memory savers, often found at retailers like Napa, promise to retain vehicle settings during battery disconnection. However, industry experts strongly advise against their use, citing potential risks to sensitive electronic systems. This article explores why professionals recommend against using OBD2 memory savers, especially during repairs involving welding.
Why Experts Advise Against OBD2 Memory Savers
The consensus among leading automotive repair professionals and organizations like I-CAR is clear: OBD2 memory savers are not recommended. These devices, intended to maintain power to vehicle modules while the battery is disconnected, can inadvertently create electrical pathways that expose vulnerable systems to damage.
Risk of System Damage During Welding
Welding operations generate high voltages and amperages that can overwhelm electronic circuits. While disconnecting the battery typically safeguards these components, a memory saver can bypass this protection, leaving systems susceptible to irreversible harm. Experts like George Hogan, a business development manager with Axalta Coating Systems, point out the heightened risk of fault codes and damage due to unexpected signals introduced by the memory saver.
Interference with “Always-On” Systems
Modern vehicles often feature systems that remain active even with the ignition off, such as keyless entry. As noted by an automaker engineer consulted by Hogan, these “always-on” systems are particularly vulnerable when a memory saver is used during welding. The constant search for signals from the key fob, coupled with the electrical activity from welding, can lead to malfunctions or damage.
Defeating the Purpose of Battery Disconnection
Disconnecting the battery serves as a crucial safety measure during repairs, isolating sensitive electronics from potential harm. Using an OBD2 memory saver negates this protection, essentially providing an electrical path through the system and increasing the risk of damage. Chuck Olsen, director of advanced diagnostics and technical support for Collision Diagnostic Services, emphasizes that memory savers might be acceptable for simple battery replacements but are strongly discouraged for other repairs.
Potential for Airbag Deployment and Module Damage
Larry Montanez, a former I-CAR instructor and collision damage analyst, highlights the potential for even more severe consequences, including accidental airbag deployment and damage to sensitive electronic modules. Electromagnetic interference (EMI) generated during welding, especially resistance spot welding, can disrupt these systems even with the battery disconnected. A memory saver further amplifies this risk. Montanez also notes that many OEMs require disconnecting the Supplemental Restraint System (SRS) modules during welding to prevent shorts, a precaution rendered useless by a memory saver.
Conclusion: Prioritize Safety Over Convenience
While the convenience of an OBD2 memory saver might seem appealing, the potential risks far outweigh the benefits. Experts unanimously recommend against their use, especially during welding or complex repairs. Disconnecting the battery remains the safest practice for protecting vehicle electronics. Prioritize safety and avoid potential damage to expensive components by adhering to industry best practices and foregoing the use of memory savers. Consult your vehicle’s specific repair manual for proper procedures and always prioritize safety.
