P0943high severityPowertrain
Hydraulic Pressure Unit Cycling Period Too Short
on 2008 Dodge Viper 8.4L V10 · RWD
What this code means
The transmission hydraulic pressure accumulator is cycling on and off too frequently. This often points to a leak in the hydraulic system or a failing pump that can't hold pressure.
Symptoms
- Harsh or erratic shifting
- Transmission warning light on
- Whining noise from transmission
Common causes
- Internal transmission fluid leak
- Faulty hydraulic pump
- Worn accumulator or seals
- Low transmission fluid level
Diagnostic steps
- Check transmission fluid level and condition
- Scan for related transmission codes
- Test hydraulic system pressure
- Inspect pump and accumulator for wear or leaks
🔌 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