[emailpeter]

Guys, appreciate all help you can give.
Have another thread on this, P261C - Aux Coolant Pump

My Touareg 2013 7P T3, 3.6L VR6 Petrol.

INITIAL ERROR
1 Fault Found:
12348 - Coolant Pump 2
P261A 00 [104] - Open circuit
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 16
Mileage: 102658 km
Date: 2020.01.02
Time: 21:55:39

I googled the part number, plenty avail on aftermarket (incl China). Thought it was very common problem, so I got one, photos are in my above posting. But changing to new one gave rise to same CEL's as OP. After every 2 rides.

AFTER REPLACING COOLANT PUMP
2 Faults Found:
12348 - Coolant Pump 2
P261A 00 [096] - Open circuit
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 120383 km
Date: 2020.09.05
Time: 12:22:30

12351 - Coolant Pump 2
P261C 00 [237] - Short to GND
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 120389 km
Date: 2020.09.05
Time: 12:33:14

I am going to check the relay next, presumably it's located at engine bay, next to cabin air intake well. Also might check the connector again for any wiring shorts etc.

For those who solved it, can kindly guide me. Thanks

 

[emailpeter]

Thanks for your reply. It was a very difficult find, I did that 5 weeks ago.
But after changing to an after-market pump, it worked for 2 weeks, then showed my above stated dual-errors.

Can you guide me to the relay too, I can't seem to find it, the engine plenum fuse box only had 2 relays in there, not related to pump. Need to check the relay properly before I buy an Original pump as 2nd replacement.

Seems I have the same issue as OP

Thanks

 

[emailpeter]

I too have the same issue, bought electrical pump from aliexpress for 22$. Replaced it but alarm is still there. The problem is not the pump but perhaps we are misguided. Do you have diagnostics device which can read long coding value?
I have ODBEleven and engine ecu coding shows that the car has 2 electric water pumps(touareg 2011 VR6). I have found one, the other is not electric but mechanical attached to the belt. So can you reffer to the picture i have attached. The hexadecimal value 43 in 5th byte group, do you have it or its onther number?
Because i started to doubt that the car may have 2 pumps. @VWBob has posted his coding and engine ECU also has 43 in 5th byte group. So it must have 2 electric pumps. @G6mdxvct has suggested that it may be behind alternator above oul cooler, and he is perhaps correct. Need to check. I found a water hose entering in the engine but not sure if its a pump.

Hi R9guy,
We will positively nail this soon. Hoping that @VWBob and @kickboxin can share their findings, we solve it faster.

Here is my coding:-
Address 01: Engine (J623-CGRA) Labels: None
Part No SW: 03H 906 023 AC HW: 03H 907 309
Component: 3,6l FSI EU4 H16 8035
Revision: M7H16---
Coding: 002A0012432600000000
Shop #: WSC 31414 790 00001
ASAM Dataset: EV_ECM36FSI0110H3906023AC 002003
ROD: N/A
VCID: 63DCBE0F3B55419A6282911-8036

No ASAM data for: "EV_ECM36FSI0110H3906023AC" (VW52)
1 Fault Found:
12351 - ROD - Unknown Error Code
- 00 [237]
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 11
Mileage: 120679 km
Date: 2020.09.07
Time: 12:44:39
Readiness: 0000 0000

1. Your theory of having 2 elec pumps-quite possible. I have asked my parts dealer to check.

2. Relay-I can't see how a forceful pump(s) can run without relay.
I have briefly checked both left and right sides of dashboard covers, no signs of any relays whatsoever. I am very sure there is bundle of them hidden somewhere else. (Given the TDI Touareg has numerous at that engine plenum box. It's either inside left or right dashboard or under the battery seat for our 3.6L.

3. In past-I thought I could "re-live the erroneous Original pump" by keeping REST mode working. My hands could reach to that pump and feel it moving and pulsing. But since it was an intermittent fault, it kept coming back. I took a chance to replace it with Aliexpress one.

4. If only we had a way to VCDS code it to increase the tolerance ohm for faults, or even delete the fault totally. If not for CEL light, I wouldn't bother with this superfluous (in my view anyway) pump.

Thanks for all help guys.

 

[emailpeter]

Thanks VWBob for your inputs. It's not inconceivable that all 3 of us r9guy, kickboxin and me have same errors after changing. We all bought the imitation part from Aliexpress. I do usually use OEM for critical parts, just that I see this pump as superfluous and wanted to save some bucks just to get the CEL off.

The pump has a 3 pin connect, hence they can't park a relay inside it (relays need at least 4 pins, and one more for canbus signal). So there must be a relay hiding outside somewhere. Once I verify that the relay is fine, I will get a OEM pump on standby, get mechanic to check the connector, If connector is fine, will put in the OEM pump and see how goes. I just want the CEL off.

R9guy-The earlier OEM had intermittent open circuit. The aliexpress one had a Short to GND once. So we can't discount it's failure yet. We ought crack open the old OEM one, see if there is any complex circuitry in there.

 

[emailpeter]

R9guy, you are quite right there is another coolant valve/pump in our system. Here is the details.

It's has an electrical connection, but our errors don't seem to point that way. Keep this in view.

My parts dealer also showed me purported electrical diagram:-

No. 31/32/33 seems likely to house relay 4H0 951 253 C. Seems next to engine plenum area, but it could also be at the under dashboard too. Will hunt it down once I finish long travels.

-Check condition of relay part no,. 4H0 951 253 C
-Trace the wire colours from there to pump and check for resistance to Pump 2 connector. If it's fine, then suspect likely rogue aliexpress pump. Poor man pays twice !!

Guys, your turn to guide me more......

 

[emailpeter]

Nice work . I dont have access to my car right now so can't try anything. But will follow your progress @emailpeter.

R9guy and Kickboxin,
I did find a diagram for relay panel. I believe we have to remove the left side underdash cover to get at it. Or even my air vent and left panel cover (my car is right hand drive). I am driving long distance still, dare not fiddle with it until back to base.

jumper Touareg (TOUA) 2015 year Volkswagen BRAZIL 937020

jumper Touareg (TOUA) 2015 year Volkswagen BRAZIL 937020 spare parts

volkswagen.7zap.com

 

[emailpeter]

Anybody now where to find the coolant pump 2 on gas v6 toureg? Its not under engine nor behind the alternator

I'm searching for that pump right now and cant find it. i have a 2013 toureg with gas v6 engine

 

[emailpeter]

P261C - Aux Coolant Pump

I need some help please. I tried to search for this code and not getting much help. I have replaced the aux coolant pump but with the cheap $80 Chinese one from ebay. I replaced it, topped off coolant, clear the codes and it comes back. I have only really seen the P261B code online. I have...

www.clubtouareg.com

This thread and above one, covers all you need to proceed.

 

[emailpeter]

This pump is so little n pain to find i pay 189 for it at Volkswagen in my area.

Yup, you are not wrong. After peeping at it, convulated removal at the bowels of the engine bay. Needed a very light person (to sit on engine) coupled with dainty hands/fingers to reach it.

I gathered my opportunity cost was far more than the cost of labour. My friendly mechanic handled it all. Sorry I can't guide you further on this, but assure you its there deep below the intake hose.

 

[emailpeter]

Reviving this old thread. During last fault (documented above), I renewed the contact points of socket, it was slightly burnt out. Then put in a new original coolant pump. 16 mths later I am getting CEL again. Same issue, tiring.......

Will recheck the wiring properly again, thereafter will reluctantly get another coolant pump (059 121 012 B). I am quite sure this is a nagging issue with pump design. It has no relay nor fuse, directly controlled from ECU, slightest of deviations, it sends out CEL.

Any insights from those having this problem ?

 

[emailpeter]

Was a video made on how to remove and replace the pump itself. I’m being told that mine has a small leak and needs replacement. I’m still waiting for a quote from the dealer.

There is no video on this, my mechanic is handling the 3rd changing of this pump. Ensure you get the original ones, made by Pierburg. And also follow 2 threads
P261C - Aux Coolant Pump | Club Touareg Forum

Replacement of additional coolant pump — Volkswagen Touareg, 3.6 liter, 2012 year on DRIVE2 (www-drive2-com.translate.goog)

Compilation of all three threads will give you enough info to
change pump.

Points to note
- 2 heat cloth covers, one thin for coolant junction, one thick for coolant pump. Ensure they are wrapped back tightly, and not near the hot catalytic, mine smouldered to flames & smoke as they came loose and almost touched cat.

- there is no fuse or relay controlling this pump. 3 wires and plug connects it straight into ECU. Ample china made pumps, best avoid, many here had issues with them. Best to get Peirburg, which is ori, but I can't seem to verify it on the 3rd pump I've bought.

It'd be great if the rest of the participants here chimed in on how they solved theirs. Prob a 5 yr recurring issue....

 

[emailpeter]

Yes, typical 5 yr fault cycle. Proximity to hot Cat, weakens the pump complex circuitry inside. I tried work w mech to relocate pump, very convoluted task. We didn't as the pipes/joints could well leak and cause a bigger issue.

My wire adapter was also fried, charred. Thinking that it was high amp, I added a fuse box on +ve to pump. To protect against shorting or over amp. I've used a 3 & 5A fuse, yet hasn't blown. Meaning so far no high amp passing thru. All this wire plug renew and pump change requires a spineless mech w snake hands. That's why we need prevent by ensuring it's done well.