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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

5v ref issues with LMM Duramax

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7 months 1 week ago #82654 by Cdh83
5v ref issues with LMM Duramax was created by Cdh83
2009 LMM Duramax, 5v ref issues
Replaced: Fuel rail sensor, Fuel pressure regulator, Engine coolant sensor, fuel filter head, rebuilt the ECM and tested, new batteries
Checked: shorted wiring, 5v at engine coolant sensor
Codes: P0117 Engine Coolant Temperature low voltage
P0462 Fuel level sensor circuit low voltage
P0522 Engine oil Pressure sensor low circuit voltage
P0652 5v reference 2 circuit low voltage
 

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  • Tyler
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7 months 1 week ago #82663 by Tyler
Replied by Tyler on topic 5v ref issues with LMM Duramax
I'd suggest following the P0652 first. Service info spells out which sensors are directly associated with P0652:

 

What does the ECM scan data show for 5V Reference 2 voltage? 0.0V is likely to be a dead short. Pinched wire, harness damage, like that. Between 0.0 and 4.8V is likely to be a resistive short. Failed sensor, or water/corrosion in a connector.

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