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1999 V70 multiple error codes, bad B+

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

stanhelp
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1999 V70 multiple error codes, bad B+

Post by stanhelp » Sat Dec 01, 2018 4:53 pm

I've a 1999 volvo v70 xc. Drove it to Farmers' Market, and all was well. Started it up again, and the idle was high, and the car was running rough. It threw 7 engine codes and 1 transmission code. The engine codes were throttle unit communication, speed signal, ecm communication, throttle position signal, accelerator position signal, ecm communication, and control module communication. The tranny error code was control module communication. Does anyone know if there's a connector where all these come together? I hope it's something simple such as that. Thanks.



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rspi
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rspi

Re: multiple error codes

Post by rspi » Sat Dec 01, 2018 5:44 pm

Sounds like a power supply issue. Check your battery cables.

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abscate
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abscate

Re: multiple error codes

Post by abscate » Sat Dec 01, 2018 5:53 pm

You need to clear all these codes and see how they come back.

Also, you need the Volvo ECM codes , not the generic descriptions


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stanhelp
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Joined: Sat Dec 01, 2018 4:46 pm
Year and Model: 1999 v70 xc
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stanhelp

Re: multiple error codes

Post by stanhelp » Sat Dec 01, 2018 6:12 pm

Thanks abscate. What I didn't say (trying to be brief) was that after jiggling some connectors (and the two computers), the symptoms went away. I have cleared the codes, but the symptoms haven't returned yet. I will check the battery connections in the morning. The jiggling and the array of codes was what made me think connector.

The codes were: ECM-902a, 510f, e000, 903f, 959f, 912a and 530b; plus tcm-e000. After a while it added TCM-261a, the long-term fuel trim. Thanks again, I appreciate your feedback.



stanhelp
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Year and Model: 1999 v70 xc
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stanhelp

Re: multiple error codes

Post by stanhelp » Thu Dec 06, 2018 8:25 pm

Found some (only a little) white corrosion on the positive battery terminal. Cleaned it off, and have not had the codes return. Didn't realize that such a small amount of corrosion would interfere with the electronics. Thanks again to abscise and rspi for your help.
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abscate
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abscate

Re: 1999 V70 multiple error codes, bad B+

Post by abscate » Fri Dec 07, 2018 6:37 am

Thanks for the follow up!
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