Flashing glow plug light / brakes no pressure?

[Dave Jennings]

Hi - 2016 T6 transporter 2.0 Diesel, 110k miles. My OH was driving home last night and the glow plug light came on and she felt a loss of power ( I guess limp mode ).

I read the codes this morning and all that's showing is P261A Coolant Pump B Control Circuit Open. Cleared the code, went a short drive, all fine.

Just went back out and started the van, glow plug light comes back on and the brakes are almost non-existent though OH said they were fine when she was driving. Any clues before I get it carted off for repair - that is, if the local garages can even fit it in before the holidays! Glasgow-ish, if it makes a difference.

 

[manfrotto]

When you say the brakes are almost non-existant, what exactly is that? Press hard but brakes not working, pedal to the floor etc?

 

[Dave Jennings]

When you say the brakes are almost non-existant, what exactly is that? Press hard but brakes not working, pedal to the floor etc?

Pedal almost to the floor, and a sound like air being pushed out like there's a vacuum in the lines. Very, very limited mechanical braking.

 

[manfrotto]

It sounds like the two issues are unrelated.

What is the brake fluid level and any sign of leakage? Could also be a leak in the brake booster - Does the pedal feel the same with engine on/engine off?
The fault code P261A is likely either the pump itself or the wiring to it.

 

[Dave Jennings]

No obvious signs of leakage, I'll need to recheck the level as it's quite hard to see in the reservoir - better light required. I'll report back later thanks!

 

[manfrotto]

No obvious signs of leakage, I'll need to recheck the level as it's quite hard to see in the reservoir - better light required. I'll report back later thanks!

Clarification - When I referred to a leak in the booster I was suggesting a air/vacuum leak, hence checking pedal with engine on and off.
Obviously still check the fluid level in master cylinder in case of that being the problem.