2007 Toyota Camry 3.5L V6 with P0606 Code: Second ECU Replacement Not Resolving Issue

Model: Camry 07 Fault Code: P0606 Posted: 2011-07-09 09:23

Hello everyone! I'm experiencing a persistent issue with my 2007 Toyota Camry (engine 3.5L, automatic transmission, federal emission standards). The car starts normally but after approximately half a mile, the "Check Engine" light illuminates along with the stability or traction control warning light (the one showing wheel icons and road traces). A diagnostic scanner reveals fault code P0606. I recently purchased a used ECU (part number 89661-06C21) from eBay, but after installation, the same P0606 code reappears. I live outside the US and am concerned about the cost of buying a brand-new ECU—this would be a significant expense. Could anyone advise on what else to check or troubleshoot before replacing the ECU again? Any insights into potential causes related to this specific P0606 code in a 2007 Camry would be greatly appreciated. Thanks in advance! Note: P0606 indicates a malfunction in the engine control module (ECM) memory or data, which may point to issues like corrupted software, faulty ECU hardware, or wiring problems. I'm seeking practical troubleshooting steps before investing further in replacement parts.