Help needed Code C1381

[jtr rhyl]

Had this code since Sept had 2 sencers changed keep going to garage but all he says is till it comes on when you get here I cannot help.
Hi all I am getting Berlingo Mulitspace 16 hdi
I keep getting code c1381 but says Temp circulating pump.
I know its ABS, but could be 3 things.
Has any one got better idea, start car up pull off may not come on for upto 10 minutes. Switch off goes when starting back up, before looking at repairing upto all 3 things, cost about £2,000 if they do not hit the problem till the third attempt.
Any help I would be thankful for.