Experiencing dashboard warning lights in your Infiniti can be concerning, especially when multiple indicators illuminate simultaneously. For Infiniti I30 owners, encountering OBDII code P1320 alongside SLIP and VDC OFF lights is a reported issue that can stem from various underlying problems. This article aims to provide a comprehensive guide to understanding and troubleshooting these symptoms, drawing from real-world experiences to help you navigate potential solutions.
When the SES (Service Engine Soon) light appears in conjunction with ABS, TCS Off, and SLIP lights shortly after starting your Infiniti and moving forward, it signals a potential system malfunction. The OBDII code P1320, often retrieved during a diagnostic scan, points towards an “Ignition Signal Fault.” This code indicates an issue within the ignition system, which is crucial for the engine’s combustion process.
The presence of SLIP and VDC OFF lights adds another layer to the problem. VDC, or Vehicle Dynamic Control, is Infiniti’s electronic stability control system. The SLIP light typically illuminates alongside VDC OFF, indicating that the Vehicle Dynamic Control system has been automatically disabled. These systems rely on various sensors and inputs, including engine performance data, to function correctly. An ignition signal fault, as indicated by code P1320, can directly impact the VDC system’s operation, leading to its deactivation and the illumination of the SLIP and VDC OFF lights.
Further symptoms, such as rear brake lights malfunctioning in “Auto” headlight mode and a gear selector lock issue, as reported by some Infiniti owners, might seem unrelated but could be indicative of broader electrical system irregularities. While these symptoms might not be directly caused by the P1320 code, they suggest the possibility of a more complex electrical problem affecting multiple vehicle systems.
Troubleshooting OBDII code P1320 and related SLIP/VDC OFF lights requires a systematic approach. Begin by confirming the P1320 code with an OBDII scanner. While a P0430 code (Catalyst System Efficiency Below Threshold) was also mentioned in some cases, focusing on P1320 is crucial due to its potential link to the warning lights and vehicle control systems.
Potential causes for a P1320 code can include:
- Faulty Ignition Coils: Ignition coils are responsible for providing the spark to ignite the air-fuel mixture in each cylinder. A failing coil can disrupt the ignition signal and trigger the P1320 code.
- Spark Plugs Issues: Worn or improperly gapped spark plugs can also lead to ignition problems and potentially contribute to a P1320 code.
- Crankshaft or Camshaft Position Sensors: These sensors provide crucial data about the engine’s rotational position to the engine control module (ECM). Malfunctions in these sensors can disrupt ignition timing and trigger the code.
- Wiring and Connectors: Damaged or corroded wiring and connectors in the ignition system can cause signal interruptions and lead to a P1320 fault.
- Engine Control Module (ECM) Issues: In rare cases, a faulty ECM itself might be the cause of the P1320 code, although this is less common.
Initial troubleshooting steps can involve visually inspecting the ignition coils and spark plug wires for any signs of damage. Checking the fuses related to the ignition system is also a prudent step, as demonstrated by the original poster’s attempt. However, if a fuse is not blown, it indicates a problem elsewhere in the circuit.
For a more in-depth diagnosis, professional tools and expertise are often necessary. A mechanic can use diagnostic equipment to test the ignition coils, sensors, and wiring to pinpoint the exact source of the P1320 code. They can also investigate the related SLIP and VDC OFF lights in conjunction with the ignition system fault. Addressing the P1320 code is crucial not only for resolving the engine warning light but also for restoring the functionality of the Vehicle Dynamic Control system, which is vital for vehicle safety and handling, especially in challenging driving conditions.
In conclusion, encountering Infiniti OBDII code P1320 along with SLIP and VDC OFF lights indicates a problem within the ignition system that can have cascading effects on vehicle control systems. A systematic diagnostic approach, potentially involving professional assistance, is recommended to accurately identify and resolve the root cause, ensuring both engine performance and vehicle safety are restored.
