I recently took my 2008 Toyota Tundra to Glendora Toyota for an issue with fluctuating voltage that was affecting my electrical components and throttle response. After some initial troubleshooting, I suspected the ECM might be the problem.The diagnostic fee started at $195, which I expected, but I soon received a call informing me that the technician needed more time to investigate, raising the minimum charge to 3 hours at $199/hour. While the cost stung a bit, I agreed, and they found that the internal regulator of my alternator (a non-OEM part I had installed myself) was causing fluctuating voltages to the ECM. They recommended replacing it with an OEM alternator for an additional $300.I approved the repair, though there was a two-day delay for the part to arrive. Once it did, they replaced it without charging extra for labor, and my truck is now running perfectly again. While it was there, I also opted for a transmission fluid swap, which added $275 to the total bill.Overall, I’m grateful that the dealership resolved the issue and my Tundra is back to normal. The team seemed knowledgeable, and the repair was thorough. However, the high costs, especially for diagnostics, were hard to swallow. If you’re bringing an older vehicle, be prepared for the possibility of extra expenses, but you can expect quality work.I would like to note that Jonathan at the service department was very attentive and helpful, he kept me in the loop the entire time and called me often with updates. He made the entire experience MUCH more convenient. Thanks Jonathan!