Experiencing the OBD2 code P0352 on your 2006 Toyota Camry with a 3.0 liter engine can be concerning. This code specifically points to a problem with the ignition coil “A” secondary circuit, which in this engine, typically refers to cylinder #2. To get a better understanding of the issue, a preliminary inspection was performed to assess the engine’s condition right after starting. The engine started without any issues, and there were no immediate signs of misfiring or rough running.
Upon removing the engine cover for a closer inspection, it was discovered that the clip on the ignition coil wire connector for cylinder #2 was broken.
For comparison, the connector clip on cylinder #4, which was intact, is shown below.
To further diagnose the problem, the ignition coils between cylinder #2 and cylinder #4 were swapped. After clearing the Check Engine Light (CEL) code, the engine was restarted. Again, the engine started smoothly, and the CEL did not reappear immediately. To investigate further, the connector from cylinder #2 was deliberately removed while the engine was running. This action immediately caused a noticeable misfire in cylinder #2, and the engine began to run roughly. A distinct “pat-pat-pat” sound could be heard from the exhaust. The CEL illuminated again, and the OBD2 code reader confirmed the same code, P0352. Interestingly, a P0302 misfire code, which would specifically indicate a cylinder #2 misfire, was not present. Reconnecting the wire to cylinder #2 immediately resolved the rough running, and the engine returned to normal operation. The CEL remained on until it was manually cleared, and it did not return after clearing.
These observations suggest that the ignition coil itself for cylinder #2 might be functioning correctly. The broken clip on the connector could be the primary issue, potentially causing a loose or intermittent connection. Even though the connector felt reasonably secure despite the broken clip, it’s plausible that this imperfect connection is enough to trigger the P0352 code. For the time being, a practical approach would be to secure the connection to the ignition coil on cylinder #2 to ensure it is tight and stable. Driving the vehicle in this condition will help determine if the P0352 code returns, indicating whether the loose connection was indeed the root cause of the problem.
