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P0685 trying to fimd the location where the Egm power relay is

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I couldn't find anything specific, but most fuses/relays are in two locations - behind the kick panel under the steering column, and under the hood (usually near the battery side wheel well).

If you take the lids off the fuse box(es), there will be diagrams to show you which slow is for which fuse or relay.

Good luck!

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

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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
- Faulty (ECM
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.

Oct 14, 2016 | 2004 Dodge Grand Caravan

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Whats the codes p0685 an p0688 on a 2004 chrysler pacifica mean


P0685 CHRYSLER - Auto Shutdown Relay Control Circuit Failure

Short or open in Auto Shutdown (ASD) relay circuit
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 CHRYSLER - Auto Shutdown Relay Control Circuit Low

The Front Control Module (FCM) has detected the supply voltage below an acceptable value
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.

Dec 29, 2014 | 2004 Chrysler Pacifica

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What is fault code p0685


P0685 Main Relay Circuit Low Voltage.

Jul 15, 2014 | Vauxhall Astra Cars & Trucks

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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

Dec 31, 2013 | Chrysler Cars & Trucks

1 Answer

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.

Sep 14, 2011 | Volkswagen Jetta Cars & Trucks

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.

Aug 06, 2011 | Chrysler Pacifica Cars & Trucks

1 Answer

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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1 Answer

I gat 3 cods P0129, P0685 and P0688 and then cam the "enable" I don't start the engine. What is the problem? Can you help me?


P0129-This Relates to Pressure for Barometric is too Low
P0685-This Relates to Open circuit for PCM/ECM Power Relay Control
P0688-This Relates to Circuit for PCM/ECM Power Relay Sense
I am not 100% sure that these are correct as I had to go through Chrysler settings to find this model.
I would check the airflow sensor first on the ducting from air cleaner to engine.
Check the spark plugs to ensure that they haven't fouled.
I hope this helps you,or get back to me with your results for further diagnosis.

Apr 02, 2011 | 2005 Dodge Grand Caravan

1 Answer

My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

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1 Answer

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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