P1684low severityPowertrain
Battery Was Disconnected Within Last 50 Starts
on 2008 Dodge Viper 8.4L V10 · RWD
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
- Clear the code and drive through 50 start cycles to allow it to expire
- If battery was not intentionally disconnected, check battery cables for looseness
- Test battery condition and charging system
- Check for parasitic electrical drain
- 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.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0005
Fuel Shutoff Valve A Control Circuit/Open
P0006
Fuel Shutoff Valve A Control Circuit Low
P0007
Fuel Shutoff Valve A Control Circuit High
P0008
Engine Position System Performance - Bank 1
P0009
Engine Position System Performance - Bank 2
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1