The strategic health authority confirmed it had commissioned the investigation.
An SHA spokesperson said: 'The review into corporate governance and financial management arrangements at Brent PCT was commissioned by NHS London in May.
'The overall aim of the review is to assist the PCT in moving forward and to make recommendations for improvement.
'Once it's completed we will make information on its outcomes available.'
The PCT has been involved in public wrangling with Brent council over costs.
The council reacted angrily after the PCT referred back about£10m worth of care, saying it fell under social care provision.
Liberal Democrat councillor Paul Lorber met with then health minister Lord Hunt on 21 June to present a dossier concerning the effects of PCT cuts on the local population.
The council then received a letter saying the PCT was under investigation.
Mr Lorber said: 'It's ongoing. The PCT has been in crisis since the middle of last year when it suddenly found serious financial difficulties and the turnaround team proposed£50m cuts in services.'
The PCT declined to comment.