× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

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

GM Exhaust pipe valve
06/28/2025 in the Technical Discussion Forum
I see many GM trucks with a spring loaded butterfly valve installed either just before the muffler or after. I believe it is normally closed. Anybody know specifically what it is there for? I notice aftermarket imitation exhaust systems omit this valve. I...
Potential fuel system issues
06/26/2025 in the Technical Discussion Forum
[Driveability: 16 GMC Yukon SLT 5.3L] System couldn't decode vin, so here it is. Codes set were P0131, P0137, P0151, PO157 PO18B, P2635 The first four are low O2 voltage codes on all four O2 sensors, as if it were starving for fuel. The last two are :Fue...
'23 Tundra EPB service mode
06/26/2025 in the Technical Discussion Forum
What did I miss with Toyota GTS+ scan tool? Under utility, there is a park brake release function. It does not put this vehicle in service mode. It errors out. No codes, cleared RoB just for the heck of it. Other A/M scan tools don't work either. TIS does...
Steering Pump Failure
06/25/2025 in the Technical Discussion Forum
[Chassis: 07 Jeep Liberty Sport 3.7L] My daughter and son-in-law, who live 5 hours away, were driving the subject vehicle when suddenly there was smoke from under the hood and steering assist was lost. The steering-pump reservoir had failed catastrophica...
Fuel trim
06/23/2025 in the Technical Discussion Forum
[Driveability: 18 Land Rover Range Rover Velar R-Dynamic SE 3.0L] Have an issue with this vehicle. Came in with a SES light. Scanned for DTCs and found P0170 fuel trim DTC. Monitored fuel trims and found that they were quite lean. I am not familiar with ...

Automotive Sponsored Discussion Forums