P1319

What it means

P1319 on an Infiniti means the engine control unit has found a fault in the reset circuit between itself and the spark plug voltage detection module for the rear bank of cylinders. The module is part of the ignition monitoring that helps detect misfires. The code sets when the expected reset signal or response is missing, out of range or shorted. Which cylinders sit in the rear bank and where the module is fitted depends on the model and engine.

Symptoms

• Malfunction indicator lamp on
• Rough running or hesitation, especially if a misfire is also logged
• Reduced power or poor throttle response
• Poor fuel economy
• Possible misfire codes stored alongside P1319

Possible causes

• Damaged, chafed or corroded wiring in the reset circuit to the rear bank module (open circuit, short to ground or short to voltage)likely
• Loose, corroded or contaminated connector at the module or engine control unitlikely
• Faulty spark plug voltage detection module for the rear bankpossible
• Ignition coil or coil wiring fault on the rear bank affecting the modulepossible
• Low battery voltage or poor earth or power supply to the modulepossible
• Internal fault in the engine control unit reset driverrare

How to diagnose

1. Read all stored and pending codes and note the freeze frame data, paying attention to any misfire codes and the conditions when P1319 set.
2. Check battery condition and charging voltage, as low voltage can upset module communication.
3. Visually inspect the wiring and connectors to the rear bank module and ignition coils for chafing, heat damage, oil contamination, water ingress and bent or pushed-back pins.
4. Using the wiring diagram for the specific model and engine, check the reset circuit for continuity, short to ground and short to voltage with the ignition off and the connectors disconnected.
5. Check the module's power and earth supplies against the manufacturer's specification.
6. Inspect the rear bank spark plugs and ignition coils for wear or faults that could affect the module.
7. Clear the code, road test and monitor live data to see whether P1319 returns and whether any misfire counts rise.
8. If the wiring and supplies are good, test or substitute the module as the manufacturer's procedure allows before suspecting the control unit.

How to fix

• Repair or replace damaged wiring in the reset circuit and secure it clear of heat and sharp edges.
• Clean, repair or replace corroded or loose connectors and terminals.
• Replace the rear bank spark plug voltage detection module if it fails testing.
• Replace faulty ignition coils or worn spark plugs on the rear bank.
• Correct battery, power supply or earth faults.
• Replace or have the engine control unit checked only after all wiring and module faults are excluded.

Can I keep driving?

This code for other makes

• P1319AcuraSpark Plug Voltage Detection Module Reset Circuit Malfunction Rear Bank
• P1319HondaSpark Plug Voltage Detection Module Reset Circuit Malfunction Rear Bank
• P1319MazdaInjection Timing Piston Position Sensor Circuit Range Performance
• P1319VolkswagenKnock Sensor 1 Circuit Short To Ground

Nearby codes

• P1318InfinitiSpark Plug Voltage Detection Module Reset Circuit Malfunction Front Bank
• P1324InfinitiKnock Sensor Power Source Circuit Low Voltage