Help diagnosing secondary pump failure code P261C00
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AudiWorld Newcomer
Joined: Jul 2024
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From: Ontario, Canada
Help diagnosing secondary pump failure code P261C00
Hi folks
Can anyone help me with diagnosing a secondary water pump failure on my 2016 Q5 (2.0 TFSI, CPM engine code)? The EPC came on and it reads fault code P261C00 "Coolant pump B Control Circuit Low." If I reset the code, it comes back pretty much immediately, so not just an intermittent fault. (I also checked whether my vehicle is covered under an earlier recall for this pump and it's not, which is why I'm tackling this myself).
My first inclination is to swap out a new pump. But before I do, are there easy ways to check whether it's something else like a bad wiring harness or relay? I have a multimeter and the Ancel V700 ODB scanner for VW, but not a VAGCOM. Visual inspection shows the wire harness is connected, dirty but intact, no evidence of fluid leaking.
Thanks folks.
Can anyone help me with diagnosing a secondary water pump failure on my 2016 Q5 (2.0 TFSI, CPM engine code)? The EPC came on and it reads fault code P261C00 "Coolant pump B Control Circuit Low." If I reset the code, it comes back pretty much immediately, so not just an intermittent fault. (I also checked whether my vehicle is covered under an earlier recall for this pump and it's not, which is why I'm tackling this myself).
My first inclination is to swap out a new pump. But before I do, are there easy ways to check whether it's something else like a bad wiring harness or relay? I have a multimeter and the Ancel V700 ODB scanner for VW, but not a VAGCOM. Visual inspection shows the wire harness is connected, dirty but intact, no evidence of fluid leaking.
Thanks folks.
AudiWorld Super User
Joined: Dec 2001
Posts: 13,996
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From: Georgia
Did you ever get the fire hazard safety recall for the B8.5 2.0T afterrun coolant pump done? The original pump is susceptible to clogging, overheating, melting, starting a fire. I would question why your VIN is not under the fire hazard recall.
https://static.nhtsa.gov/odi/tsbs/20...91814-0699.pdf
Note, the revised pump requires a modified bracket, as noted in the text.
Audi conveniently fails to document that P code in the generic scan tool workshop manual, so who knows what it accurately represents. That there's some failure of the control line to pass current when the ECM is attempting it would seem likely.
On the pump is a 3-pin plug, pin 1 is the brown wire to ground, pin 2 is the 12v wire from fuse 7, pin 3 is the PWM control line from the ECM. I'd suggest getting eyes on the connector plug sooner than later.
https://static.nhtsa.gov/odi/tsbs/20...91814-0699.pdf
Note, the revised pump requires a modified bracket, as noted in the text.
Audi conveniently fails to document that P code in the generic scan tool workshop manual, so who knows what it accurately represents. That there's some failure of the control line to pass current when the ECM is attempting it would seem likely.
On the pump is a 3-pin plug, pin 1 is the brown wire to ground, pin 2 is the 12v wire from fuse 7, pin 3 is the PWM control line from the ECM. I'd suggest getting eyes on the connector plug sooner than later.
Thread Starter
AudiWorld Newcomer
Joined: Jul 2024
Posts: 3
Likes: 0
From: Ontario, Canada
Thanks, I appreciate the info.
The VIN doesn't come back as having that recall; potentially because I'm in Canada and it's an NTSB recall? Or else it was already performed by the previous owner. Either way, I'll start with testing the fuse and wiring and work my way from there.
The VIN doesn't come back as having that recall; potentially because I'm in Canada and it's an NTSB recall? Or else it was already performed by the previous owner. Either way, I'll start with testing the fuse and wiring and work my way from there.
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