Hyundai Sonata Backup Camera Blocks Scan Tool Communication
Vehicle: 2015 Hyundai Sonata, L4-2.4L, Automatic Transmission/Transaxle
Mileage: 76,332 Miles
Problem: The owner brought the Sonata to the shop because there were multiple warning lights on in the dash and the tachometer showed zero RPMs.
Case Details: When the technician connected a scan tool, he found that there was no communication with any module. A quick call went out to an ALLDATA Tech-Assist consultant who provided some simple diagnostic tests.
The consultant suggested finding what was causing the lack of communication by first testing the C-CAN network resistance, advising if it was not within specifications (55-65 ohms), then start disconnecting components on the network one at a time to see if one or more of them are taking the network communications down.
When the technician tested C-CAN network was 30 ohms. Too low. He began disconnecting components one at a time on the C-CAN network. He found that when he disconnected the backup camera, network communication returned.
Confirmed Repair: The technician replaced the backup camera. The lights in the dash went out and the tachometer began working again. Problem solved!
The ALLDATA Tech-Assist team fields cases like this every day. See how Tech-Assist can help your shop save time and money with on-call diagnostic support from ASE-certified Master Technicians. More Tech Tips
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