Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B1004: Keep Alive Memory Data Lost: Description
Module contains a data storage area which can save pertinent data when ignition is turned to OFF position. Keep Alive Memory (KAM) data is lost if battery power is removed from the module. KAM area is an integral part of the microprocessor and cannot be serviced separately. DTC B1004 indicates that keep alive, or long term, memory in module has been reset. This is a normal occurrence whenever power or ground is removed from the module, such as when the battery is disconnected and reconnected. Microprocessor reverts back to base programmed critical operating data until new data is learned and stored in KAM. A current DTC clears when malfunction is no longer present. A history DTC clears when module ignition cycle counter reaches reset threshold, without a repeat of the malfunction.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.