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CODE P0685 HONDA - Odyssey Honda Cars & Trucks

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Posted on Jan 02, 2017

dttech
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SOURCE: trouble code p0685 vehicle wont

I cannot give you any specific help because you did not bother to mention YEAR, MAKE, MODEL, or ENGINE SIZE of the vehicle you are trying to get information on.

The "generic" description of Diagnostic Trouble Code (DTC) P0685 is: "ECM power control circuit malfunction."
Yup! this would DEFINATELY keep your engine from starting! It means that the ECM has no power to operate the engine management system. So, now you know the WHAT part of the equation. You must now diagnose, using the correct information for your particular vehicle, to find out the WHY.

Posted on Aug 06, 2011

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Wont start2004 dodge grand caravan sxt code p0685 show on dash


P0685 DODGE - Auto Shutdown Relay Control Circuit Failure
Possible causes - Faulty Engine Control Module (ECM) power relay
- ECM power relay harness is open or shorted
- ECM power relay circuit poor electrical connection
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Possible symptoms:
Engine Light ON (or Service Engine Soon Warning Light) P0685 Dodge Description: Short or open in Auto Shutdown (ASD) relay circuit, this relay is under the hood in the relay center.

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What is fault code p0685


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P0685 fault code uk ford


p0685 refers to ECM power relay control---circuit open===causes--wiring--ECM relay
Replace this relay. Check the wiring from the coil to the distributor as there is a dead short after the coil somewhere for the fuse to blow and the coil to overheat.. You may have a electronic module failure either in the distributor or the ECM

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I got code p0685. i dont know what it means exactly


This is an internal PCM failure code . The only test is to clear the code and if it resets to replace the PCM. this is covered by warranty for 8 years or 80,000 miles . So if you are under this its a free repair under warranty.

P0685 error - ECM/PCM Power Relay Control Circuit open

Hope helps.

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2 Answers

Trouble code p0685 vehicle wont start dont know what p0685 is please help


I cannot give you any specific help because you did not bother to mention YEAR, MAKE, MODEL, or ENGINE SIZE of the vehicle you are trying to get information on.

The "generic" description of Diagnostic Trouble Code (DTC) P0685 is: "ECM power control circuit malfunction."
Yup! this would DEFINATELY keep your engine from starting! It means that the ECM has no power to operate the engine management system. So, now you know the WHAT part of the equation. You must now diagnose, using the correct information for your particular vehicle, to find out the WHY.

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I have a 2003 dodge dakota. 4.7l. I get codes p0685 and p0688. No start no spark. Relay is good. But voltage drops when using a voltage meter on one of the grounds in the pdc. Any live wire and that ground...


P0685 DODGE - Auto Shutdown Relay Control Circuit Failure
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)

Possible causes - ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech notes Check all the ECM fuses, if the fuses are OK try replacing the ASD relay. P0685 DODGE Description Short or open in Auto Shutdown (ASD) relay circuit

P0688 DODGE - Auto Shutdown Relay Control Circuit Low
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)

Possible causes - ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech notes Check all the ECM fuses, if the fuses are OK try replacing the ASD relay. P0688 DODGE Description The Front Control Module (FCM) has detected the supply voltage below an acceptable value

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F/C P0685 Replacede the ASD relay and need to know if the computer needs to be reset?


You can reset it by disconnecting the battery for a couple minutes and reconnecting it. This will turn off the engine light and reset the adaptive memory.

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