2011 Volkswagen Jetta Stalling
Here is a case study I have just completed, this VW has an intermittent cold stalling issue.
Excellent as always. The concern stated that the stalling occurred less after the vehicle warmed up. If that was an accurate observation, how would that relate to an internal PCM fault? Poor electrical connections/solder joints? Something else?
Great process of elimination. Thanks for posting Bernie!
Eric The most probable cause would be solder joints in the ECM.
I'm thinking bad solder joint also. Would preheating the PCM with a hot air gun, to where the vehicle stalls much less have help with the diagnostics. Would the tap test (beating the PCM with a screwdriver handle) caused the vehicle to stall? I wonder what would happen if the PCM was left in the freezer overnight, would you get a no-start, and warmed up with the heat gun, a start. Nice job…
Awesome stuff Bernie. Had a similar issue on a 20 Tiguan earlier in the week. Would stall after running about 15-30 seconds. Many modules reporting no comm with ECM all the time. Could not read DTC's from ECM. Could only read MVB's when it was running. Checked all powers, grounds and CAN lines during stall. All okay. Waiting for the ECM to finish the job.
Thanks for that Bernie. Leaves no doubt. The VSS input is a great thought. I would not have been looking for that.
Great job Bernie. Would you consider a PCM software update next?
Sean It would be a good idea to check for software updates before the PCM is replaced.