What this code means

The PCM has recorded that battery power was lost or disconnected within the last 50 engine start cycles. This is an informational code that indicates the PCM adaptive memory was reset and the system is relearning.

Symptoms

• Check Engine Light (temporary)
• Slightly rough idle during relearn
• Transmission may shift differently during relearn
• Fuel economy temporarily reduced

Common causes

• Battery recently disconnected for service
• Battery replaced
• Loose or corroded battery cable
• PCM fuse momentarily lost power
• Parasitic drain completely discharged battery

Diagnostic steps

1. Clear the code and drive through 50 start cycles to allow it to expire
2. If battery was not intentionally disconnected, check battery cables for looseness
3. Test battery condition and charging system
4. Check for parasitic electrical drain
5. Inspect PCM power supply fuses

Repair notes

This code will clear itself after approximately 50 key-on cycles; no repair needed unless the battery disconnect was unintentional.

Other Powertrain codes on this vehicle