Technical Description of OBD-II Trouble Code
The fuel injector circuit for Group E is experiencing high voltage.
What does that mean?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles, including Dodge Ram (Cummins), GMC Chevrolet (Duramax), VW, Audi, Ford (Powerstroke), Mercedes Sprinter, Peugeot, Alfa Romeo, Nissan, Saab, Mitsubishi, etc. While the steps for repair may vary depending on the year, make, model, and powertrain configuration, fuel injectors are an important part of modern fuel delivery systems in vehicles. These systems use various components to control and monitor the volume, timing, and pressures of the fuel system in conjunction with the ECM (Engine Control Module). Fuel injectors are more efficient and effective than carburetors, leading to improved fuel economy. However, issues in the fuel injector circuit can cause significant drivability problems and other potential hazards.
The letter “E” in this code indicates the specific circuit that is experiencing the fault. To understand how this applies to your vehicle, consult the manufacturer’s technical information. Examples of distinctions with injectors include Bank 1, Bank 2, paired injectors, and individual injectors.
The ECM will illuminate the MIL (Malfunction Indicator Lamp) with codes P216C and/or related codes (P216A, P216B) when it detects a fault in the supply voltage to the fuel injectors or their circuits. It’s important to note that the fuel injector harnesses are located in close proximity to extreme temperatures, making them susceptible to physical damage. Therefore, in most cases, this issue is mechanical in nature.
The P216C Fuel Injector Group E Circuit High code is active when the ECM detects a high electrical value in the supply voltage circuit for the fuel injectors or their circuits.
What is the severity of this DTC?
This DTC is considered quite severe. When an engine runs lean due to a lack of fuel in the mixture, it can cause extreme engine damage in the short and long term. It is crucial to maintain your engine properly to prevent such issues and ensure smooth and efficient operation.
What are some of the symptoms of the code?
Symptoms of a P216C trouble code may include:
What are some of the common causes of the code?
Possible causes for this P216C fuel injector group supply voltage code include:
What are some P216C troubleshooting steps?
Basic Step #1
The first recommended step is to determine which “group” of sensors the manufacturer is referring to. With this information, you can locate the physical location of the injector(s) and their circuits. This may involve removing engine covers and components to gain visual access. Inspect the harness for shorts to other power wires and repair any worn-away insulation with shrink-tube to prevent further issues.
Basic Step #2
In some cases, water and fluids may accumulate in the valleys where the injectors are installed, leading to increased corrosion of the sensor’s connectors and other electrical connections. Ensure that everything is properly connected and that the connector tabs are sealing the connection. Use electrical contact cleaner to improve electrical connectivity within the connections.
Basic Step #3
Verify the integrity of the circuit by following troubleshooting steps provided in your specific vehicle’s service manual. For example, you can disconnect the supply voltage circuit from the ECM and at the fuel injector, and then use a multimeter to check the condition of the wires.
One quick test to determine if there is an open within a particular wire is to perform a “continuity test” using a multimeter set to RESISTANCE. Touch one end of the multimeter to one tip of the circuit and the other end to the other tip. Any higher than the desired value may indicate a problem within the circuit. Further diagnosis will be necessary to identify the specific wire causing the issue.
