C4 Lack Of Power - Battery Fuse Box Fault

[paul.h]

Our 2015 C4 1.6 hdi 115 hp was suffering from poor acceleration at low revs, noticed just after a service but this was a coincidence. I could push down on the accelerator pedal and it barely accelerated until the revs got to about 1800. This also made it a bit difficult when setting off, needing to rev the engine more than normal before letting the clutch pedal up.

 

The engine management light was not on but a diagnostic at the dealer found a Citroen specific U fault code which showed an open circuit in the fuse box on top of the battery. A known symptom for the fault included a lack of power. This has now been replaced under warranty and the car is back to normal.

 

Other names for this fuse box seem to be BPGA supply management and protection control unit, power relay unit.

[Rookie2]

Is that the same on earlier Pug/ Cit cars Paul ?

[paul.h]

On the Citroen cars we've had, only the C4s have a fuse box on top of the battery but I guess its internals must be within the fuse boxes of the other cars. This would suggest a lack of power could be a fuse box problem if the other obvious things like the turbo are ok.

[Rookie2]

Thats interesting to know and certainly something I would never have thought have, will watch out for that one. cheers Paul