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2008 S40 ECM-91AC, ECM-9918 Codes

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
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dreadie
Posts: 2
Joined: Fri Jun 30, 2017 6:29 pm
Year and Model: 07 S40
Location: Pennsylvania
United States of America

2008 S40 ECM-91AC, ECM-9918 Codes

Post by dreadie » Fri Jun 30, 2017 6:34 pm

Hey All:

Long time lurker, first time poster. My 2008 S40 has been plagued recently with multiple ECM Codes via vida:

ECM-91AC - Throttle Valve - Faulty Signal
ECM-9918 - Throttle Valve - Faulty Signal
ECM-9A0A - Vehicle Beaviour - Behaviour 4

(This also leads to reduced engine performance)

This started to occur about 2 months ago, at which point I replaced (with a used) the throttle control valve/module assembly and cleared the codes - this "fixed" the problem for two months, however it reared its ugly head again on me today.

I got another throttle control valve/module and replaced it again, cleared the codes like before, however now the codes are coming back w/ reduced engine performance. Only difference is this time since it was replaced, under acceleration there is a ticking noise coming from under the hood/bonnet, almost like a clock ticking.

Anyone have any thoughts on where to go from here? Thanks in advance.

dreadie
Posts: 2
Joined: Fri Jun 30, 2017 6:29 pm
Year and Model: 07 S40
Location: Pennsylvania
United States of America

Re: 2008 S40 ECM-91AC, ECM-9918 Codes

Post by dreadie » Mon Jul 03, 2017 1:55 pm

Got it figured out - separated wire at the throttle module connector - broke about .5" away from the plug, temporarily resoldered, new plug on the way.

Thanks for the assistance.

JamesC
Posts: 1
Joined: Tue Jun 05, 2018 10:39 am
Year and Model: 06XC
Location: TX
United States of America

Re: 2008 S40 ECM-91AC, ECM-9918 Codes

Post by JamesC » Fri Jan 11, 2019 9:36 am

Hello,
I'm helping a friend with a V50 with these exact same codes. Is the module mentioned, to fix this, the entire throttle body?

Volvo Throttle Body (S40 S60 V50 V70) - 31216327

Thank you!

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