Question about 2001 Volkswagen Jetta TDI
Fault codes explanation:
P0725 = Engine speed input circuit; CAN-BUS no communication with Engine Control Module (ECM); Invalid data received from ECM; damaged ECM.
P1850 = Data-Bus Powertrain missing message from ECM.
P1875 = Transmission Automatic Hall Effect sensor power circuit short to battery
I recommend you to access the ECM memory using VAG or similar diagnostic tool. But if you need to check a few things before scanning, I would recommend the following checks in your case:
- check the battery cables (clean and tight contacts)
- check engine ground cable (clean and tight contacts)
- check ECM (Engine Control Module) connectors and ground, the ECM is in plenum chamber under the windshield.
Having checked this wiring (most likely culprit), and made sure that contacts are clean tight, and connectors are fit, if the problem persists, (unlikely), you would need to get the codes using a VW equipment, to get the proper codes.
PS: there are some bulletins refering to ECM software updates on your model, so you should also check these out, if the problem points to ECM replacement eventually.
Posted on May 25, 2011
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Posted on Jan 02, 2017
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