ABS Brake Issues Code 67 and 68 and Spongy brakes

[Beezil007]

I have a 1997 C1500 that has its ABS light on, I have had it scanned and came up with fault codes

*Code 67: open motor circuit or shorted BPMV output
*Code 68: locked motor or shorted motor circuit

I am after some advice on what you think is a good place to start

Also the brakes seem spongy also???

Thanks

 

[grampadirt]

Those codes are for an OBD1 system,yet you say you have a '97 truck which is an OBDII system....what's up?

 

[delta_p]

Those codes are for an OBD1 system,yet you say you have a '97 truck which is an OBDII system....what's up?

Because those are ABS codes, not OBD1 or OBII codes which are the engine.

 

[delta_p]

If you can go to this page and download Volume 2 of 1998 I believe you can use the same diagnostic check to investigate your codes.
https://www.gmt400.com/threads/88-95-service-manuals.43575/

'96 and '97 coded as 67/68 but '98 coded it as 267/268. The information you want is Volume 2 '98, page 5-231, or page 831 of the pdf.

 

[brian c lindsey]

Your Vehicle: 1998 GMC Truck K 1500 Truck 4WD V8-5.7L VIN R


Vehicle » A L L Diagnostic Trouble Codes ( DTC ) » Testing and Inspection » Diagnostic Trouble Code Descriptions » Antilock Brake System (ABS)


Antilock Brake System (ABS)

Diagnostic Trouble Code Descriptions

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[brian c lindsey]

sounds like you need a new abs pump

 

[Beezil007]

Some Really Good replies many thanks, Where is the best place to get a new ABS pump if i need this?

 

[delta_p]

Not sure if you can get just a pump since it's integrated in the ABS unit. Might be hard to junk yard an ABS unit in New Zealand?

I think you should use a DVM and run through the diagnostic at the link above for "testing and inspection, C codes charts"

The pump motor is supplied power through a 60 amp fuse that could be blown, or the ground path on the harness. It could just be the wiring on the harness side that needs dressing or maybe just the fuse. The diagnostic using a volt meter (that's the tool they're calling for) will identify if it is the pump or internal circuitry.