Universal (All Makes) Vehicle (OBD-II)
Severity:Common Causes
- map[cause:Faulty security module generating incorrect message data]
- map[cause:CAN bus communication fault causing dropped or corrupted messages]
- map[cause:Low battery voltage causing module resets and counter mismatches]
- map[cause:Damaged CAN bus wiring causing data corruption]
- map[cause:Aftermarket security system interfering with factory security module messages]
How to Fix It
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Check the vehicle battery — low voltage causes many module communication faults.
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Scan all modules with a full-system scan tool and check for CAN bus error codes.
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Inspect CAN bus wiring for damage, shorts, or open circuits.
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Remove any aftermarket security devices and retest.
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Have the security module reprogrammed or replaced if the fault persists.
Frequently Asked Questions
Could an aftermarket alarm cause P2958?
Yes. Aftermarket systems that tap into factory wiring can disrupt CAN bus communication. Removing or properly installing the aftermarket unit often resolves this.
Can a dead battery cause P2958?
Yes. When the battery drops below normal operating voltage, modules can reset and lose synchronization. Replace the battery and clear codes first before doing anything more complex.
Is P2958 a theft risk?
Not directly — it's a fault in the communication, not the security system itself. But a failing security module could affect anti-theft function. Have it evaluated by a dealer or security specialist.