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Defence Minister Jeremy Quin has said he "cannot 100% promise" that noise and vibration problems with the Army's new fleet of armoured vehicles can be resolved.
He told MPs the programme remains "troubled" and said he could give no deadline for issues to be sorted out.
Labour said the programme is on "end of life watch".
The Ministry of Defence (MoD) signed a contract for 589 of the Ajax armoured vehicles in 2014 and has already spent nearly £3.5bn on the troubled flagship programme.
The vehicles, which are fully digital, were billed as the "next generation" of armoured vehicles but have been beset by problems.
Trials were halted in March and again in June after crews reported problems with noise and vibration.
Making a statement in the Commons, Mr Quin confirmed independent trials had resumed at the testing site, Milbrook.
He said time and space was needed to get results and data would not be available this month because "considerable work needs to be undertaken".
And he admitted that vibration concerns were raised before trials first began in 2019.
But he said he hoped issues could be rectified and the vehicles brought in to service.
An independent report by the MoD's director of health and safety would also look at the concerns raised, he added.
He said: "I have previously described Ajax as a troubled programme. It is, but that does not mean that the problems are irresolvable."
The system represents a step-change in the capabilities of the British Army, he added, but he said that ministers would "never accept a vehicle that does not meet our testing requirements" and would work with the manufacturer, General Dynamics, to fix the outstanding issues.
But Labour's shadow defence minister, John Healey, said it was a "shocking" admission that "it is not possible to determine a realistic timetable" for Ajax's introduction into service could be given.
He said that it had gone "from bad to worse" since ministers last updated MPs three months ago.
"This is a programme that has cost £3.5bn to date, delivered just 14 vehicles and is set to be completed a decade late.
"The minister's statement now puts Ajax on an end of life watch," he added.