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Automotive Technical Discussion Forum

Professional automotive forum for all types of vehicle repair discussion that does not fit into one of our more specific technical forums. Discussions include both OBD and OBD2, engine performance analysis, diagnostic best practices, service information, vehicle standards such as J1962, J1939, J2534, OBD2 modes (e.g. MODE$06), ignition and fuel system analysis, alternative propulsion (e.g. hybrid, electric, natural gas), and more. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Technical Theory Forum.

Recent Automotive Discussions in the Automotive Technical Discussion Forum

'14 Town & Country no power climbing hills (Won't downshift)
12/29/2025 in the Technical Discussion Forum
[Transmission: 14 Chrysler Town & Country Touring 3.6L] Alright, I'll try and be thorough with this post, but I haven't done enough testing to understand what's going on. That's due to the intermittent nature of the issue. Although I'm going to give ALL ...
2014 VW Passat Diesel SCR issues
12/29/2025 in the Technical Discussion Forum
I just replaced the Reductant injection Valve on this vehicle DTC P204800-P208E00 everything is working fine. It is saying in 25 miles the car will not start. Does this car have to go to the dealer to have this reset or can I do it with my Autel? I did tr...
Starter motor Circuit
12/29/2025 in the Technical Discussion Forum
[Electrical: 09 Nissan Maxima S 3.5L] Group, A 2009 Maxima shows with a blown 250 A main fuse at the battery. The current /circuit wiring diagram shows a direct path to the starter armature through the 250 A main fuse. Testing on car shows that the armat...
Fusible link
12/24/2025 in the Technical Discussion Forum
[Electrical: 07 Scion tC 2.4L] I have this 2007 Scion tC and the positive battery cable is burnt/melted at the fusible link. The wiring diagram describes the fusible link as "3 GA/WHT", but I cannot find anything at our local parts store to match. It pow...
need wiring diagram
12/18/2025 in the Technical Discussion Forum
2025 Chev express van [...] Simply need a diagram for the exterior lights, Left turn signal to be exact. The 2024 diagram is not the same. I have found that there are fuses in the underhood fuse block for rear turn signals that do not appear on the 24 dia...

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