2005 Dodge Caravan P0202 Code: Is the Engine Control Module (PCM) Faulty?
I own a 2005 Dodge Caravan that has recently developed serious engine issues. The vehicle runs roughly, emits smoke, and has a strong smell of unburned fuel. After checking for diagnostic trouble codes using the 'on-off' method (turning the key three times), I found a persistent P0202 code. Upon initial inspection, I noticed severe fraying in the wiring of the #2 fuel injector, as well as some damage on other injector harnesses. To resolve this, I replaced the entire fuel injector and rail assembly with a used unit sourced from eBay, hoping to eliminate both injector and wiring-related problems. After reconnecting the battery and starting the engine, the vehicle still runs poorly and continues to display the P02002 code. I've carefully inspected the connection between the injector harness and the main harness, and no visible damage is present. Given this ongoing issue, am I correct in assuming that the Engine Control Module (PCM) has failed? Are there any other potential causes or diagnostic steps I should consider before concluding the PCM is at fault?
First, use an OBD2 scanner to retrieve codes—relying on the 'on-off' trick may not capture all stored faults. The harness issue you described is common; verify that the circuit for the #2 injector to the Powertrain Control Module (PCM) is intact (no grounding, open circuits, or short to voltage). Ensure the connector is securely attached and all pins are properly seated. Confirm that there is proper voltage present at the injector from the PCM side. If all these checks pass, then it's likely that the PCM has been damaged due to the original harness fault—specifically, a failure in the #2 injector driver circuit.