Lost Communication With Engine Control Module/Powertrain Control Module
Table of contents
U0100 TOYOTA Possible Causes
- Faulty Engine Control Module (ECM) / Powertrain Control Module (PCM)
- ECM/PCM harness is open or shorted
- ECM/PCM circuit poor electrical connection
How do I fix code U0100 TOYOTA?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the U0100 TOYOTA code
The cost of diagnosing the U0100 TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
U0100 TOYOTA Description
Modules connected to the high-speed Local Area Network (LAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module.
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