car didnt start 10 mins after a 30 mile drive had to be jump started

[toby2can]

as above, runs fine now but left this code

00532 - Supply Voltage B+
00532 - Supply Voltage B+: Signal too Low
Possible Causes

    Wiring/Connectors from/to Control Module faulty
    Power Supply (Battery/Generator) faulty

Possible Solutions

    Check/Repair Wiring/Connectors from/to Control Module
    Check Power Supply (Battery/Generator)

Special Notes

    When found in an individual control module, it's most likely a local source (e.g. wiring/connectors).
    When found in multiple control modules at the same time, it's most likely a common source (e.g. ground spot, battery, generator).
    Intermittent codes are often stored during low outside temperature when the battery capacity goes down and may be ignored.
    Common with 16946/P0562/001378 - System Voltage: Too Low stored in other control modules.

where do i begin?

[Agreeable Slick]

You begin with having a look on the search function for battery problems.

It will involve going around the engine bay with a multimeter.