P0641 Code - Sensor Reference Voltage 'A' Circuit/Open

What Does P0641 Mean?

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue. When you see P0641 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0641 ?

• Faulty Engine Control Module (ECM)
• ECM harness is open or shorted
• ECM circuit poor electrical connection
• Shorted sensor on 5 volt circuit

How do you troubleshoot P0641 ?

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

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