Help needed with check engine diagnostics - Diesel Truck Forum -
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post #1 of 1 (permalink) Old 01-04-2008, 04:12 PM Thread Starter
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Help needed with check engine diagnostics

I had my truck (2002 chevy 1 ton, duramax, w/ Allison trans) put on a computer and received the following readings:

1.) PO843 - Voltage signal from transmission fluid pressure sensor/switch 'A' too high for current operating conditions.

2.) PO540 - Malfunction exists in electrical curcuit for intake air heater.

Can you guys tell me what these readings mean, and what i need to do to fix 'em.

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