Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pcm Code E047, IPC-To-Pcm Data Problem: Description
PCM and IPC share information through Universal Asynchronous Receiver Transmitter (UART). IPC is master link and data are only transmitted at IPC request. Data are sent in 8-character blocks at a rate of 8192 characters per second.
Data from PCM to IPC contain engine operating information. PCM-IPC data include CTS, RPM and injector pulse width values so IPC can control cooling fans, display RPM and calculate MPG for display at Driver Information Center (DIC) panel. IPC sends PCM air conditioning status to be used for idle speed control and ambient temperature for use in VCC application and release decisions.
PCM Code E047 is set in PCM in event of a UART failure. If fault is a current failure, PCM will not be able to communicate with IPC and PCM Code IO34 will be displayed as current. PCM Code E047 is current in PCM but cannot be sent (displayed) to IPC because of UART fault. If UART fault is corrected, both PCM Code E047 and IO34 will be displayed as history codes.
PCM Code E047 should be diagnosed using chart for IPC Code IO34. Refer to appropriate ELECTRONIC INSTRUMENT PANELS article in the ACCESSORIES/SAFETY EQUIPMENT Section.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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