How severe is this DTC?
I would say rather severe. In the field, we call a lack of fuel in the burned mixture a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to transport us daily.
What are some of the symptoms of the code?
Symptoms of a P2154 fault code may include:
- Irregular engine performance
- Misfire
- Reduced fuel economy
- Irregular idle
- Excessive smoke
- Engine noise(s)
- Lack of power
- Inability to climb steep hills
- Reduced throttle response
What are some common causes of the code?
Causes of this P2154 fuel injector group supply voltage code may include:
- Faulty or damaged fuel injector(s)
- Damaged wiring harness
- Internal wiring malfunction
- Internal ECM issue
- Connector problem
What are the P2154 troubleshooting steps?
Basic Step #1
The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access (if possible). Be sure to inspect the harness for short circuits to other power wires. Any worn insulation should be properly repaired with a shrink tube to avoid further issues and/or future ones.
Basic Step #2
Sometimes, water and/or fluids can be “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Ensure everything is as expected and that the connector tabs seal the connection properly. Do not hesitate to use an electrical contact cleaner to make everything connect and disconnect smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.
Basic Step #3
Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s maintenance manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine whether the wires are in good working condition or not.
A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2154 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.