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2006 Dodge Charger 2.7L V6 P0206 Fault: PCM Not Sending Negative Ground Pulse?

Model: dodge charger Fault Code: P0206 Posted: 2015-08-17 12:24

Hi, I'm experiencing an issue with my 2006 Dodge Charger 2.7L V6 engine. My OBD2 scanner detected a P0206 code, indicating a circuit fault related to fuel injector #6. I replaced the injector for cylinder #6 and swapped it with the one from cylinder #5. After the swap, the engine ran smoothly — this suggests that the issue is not with the injector itself. Upon further inspection, I found no short in the wiring or connector. The power supply to the injector's positive terminal reads 14 volts when the engine is running. However, there is no voltage on the negative side of the injector circuit. I tested the wire from the PCM (pin #4 in the orange section) by directly grounding it — and the injector functioned normally. This indicates that the PCM is not sending a proper ground pulse to the injector's control circuit. Given this behavior, I believe the problem lies with the Powertrain Control Module (PCM). Is there any other component or system capable of controlling fuel injector operation in this vehicle? I'm looking for confirmation on whether the P0206 code is truly a PCM-related issue and if there are standard diagnostic steps to verify this before replacing the PCM.

Related fault codes
P0206
Comments (3)
Anonymous 2015-08-17 12:39

Could you confirm the location of cylinder #6? (e.g., driver's side or passenger's side) — this helps ensure we're all on the same page. What year model is your Charger? This will help locate the correct wiring diagram. P0206 typically indicates a circuit issue, not just an injector failure. After swapping injectors between cylinders 5 and 6, if the P0206 code persists, it points to a problem in the wiring or control signal path. To troubleshoot further: - Unplug the injector and check for 12V on the positive terminal — if no voltage is present when the engine is running, that may indicate an issue with power delivery. - Inspect the injector connector for physical damage, corrosion, or frayed wires within inches of the connection. Using a digital multimeter (DVOM): - Test the control wire from the injector to the PCM — this wire should show no voltage when not active and should be properly grounded when commanded by the PCM. If it shows voltage or is open/shorted, that could indicate a wiring fault or faulty signal path. This test will help determine whether the issue lies in the wiring or if the PCM itself is malfunctioning.

Anonymous 2015-08-17 16:54

Cylinder #6 is located under the throttle body. The vehicle is a 2006 model. I swapped the injector from cylinder #5 to #6 to test functionality — and it worked immediately, confirming that the injector itself was not faulty. I have confirmed 12V on one side of the injector (positive), but no voltage on the other side when the engine is running. I tested the wire by unplugging it from the PCM at pin #4 in the orange connector and applied a direct ground — this allowed the injector to function properly. This strongly suggests that the PCM is not sending the required negative ground pulse to the injector circuit. Based on this, I believe the issue is likely due to a failing PCM.

Anonymous 2015-08-17 21:03

I was just confirming the physical location of cylinder #6 — driver's side or passenger's side. Regarding the 'negative pulse': The PCM grounds the injector control wire, which causes the voltage on that wire to drop from 12V to near zero when commanded. This signal is critical for proper fuel injection timing. The key diagnostic steps are: - Check continuity of the wire between the PCM and the injector — resistance should be less than 5 ohms. - Verify if the wire is open, grounded, or shorted to power. - Use a NOID light on cylinder #6: it should flash (indicating active injection) or show steady light (indicating continuous operation). If neither occurs, this confirms a signal failure — likely originating at the PCM.