DTC fault code P0687 ?

Blue2

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Nov 20, 2021
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Hello, any advice would be much appreciated with the fault code P0687. The relay 100 in the engine bay fusebox is constanly buzzing and the running of the engine ain't great. On looking up this code the explanation of ECM/PCM Power Relay-Control Circuit High is given. Worst case might the engine ECM is banjaxxed but not sure just now, would corroded connections around this fusebox be one of many causes ? Greetings to all out there ✋
 

Blue2

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Nov 20, 2021
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Thanks for replying, It's a December 2010 van with the engine code CAY 467119. My plan as such is to change the EMC/PCM relay 109.
The faults as i mentioned before were that both the engine management light and the glow plug lights were coming on with the engine struggling to rev above 2000 rpm. Also the relay no. 100 situated in the engine bay fusebox was constanly buzzing even with the ignition off so i had to remove it to avoid damage elsewhere in the system.
 

Crasher

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That would be a CAYD (102PS) or CAYE (75PS) engine and would also make the van a B year VIN (2011 model year), type 2C vehicle so a Caddy 4. These do not have a 109 control group number ECU relay, the J757 ECU power relay which supplies fuse 13 in the engine bay fuse box (and many others) is at position A1 on the engine bay relay holder and has the number 100 on top or 458 if it is a replacement part, the part number is 1K0 906 381 and retails at £24.61.
 
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