What does it mean?
P1316 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Spark Plug Detection Module Circuit Fault (Bank 2) .
Symptoms
- MIL (check engine lamp) on
- Bank 2 misfire codes stored alongside this one
- Rough running, hesitation and reduced power
- Hard starting, particularly when damp
- Ignition data for that bank unavailable or frozen in the scan tool live list
Likely causes
- Open, shorted or high-resistance wiring between the spark detection module and the engine control module on Bank 2
- Corroded, wet or loose connector at the detection module
- Missing power feed or ground to the module: blown fuse, failed relay or a corroded ground stud
- Failed spark plug detection module
- A genuine ignition fault on Bank 2 producing signals the module cannot interpret, such as a failed coil, a cracked boot or a worn plug
- Moisture inside the module housing after washing or a water leak
How to fix it
- Read the freeze frame and note any accompanying misfire or coil codes on Bank 2
- Inspect the detection module connector and the harness running to the engine control module
- Measure power and ground at the module with the key on, using a voltage drop test on the ground
- Check continuity of the signal lines between the detection module and the engine control module
- Inspect Bank 2 coils, boots and spark plugs for arcing, wear and carbon tracking
- Repair the harness or replace the detection module once the supply and wiring are proven
- Clear the codes and confirm the fault does not return over several drive cycles