Because the glow plugs were faulty it was causing an anti-pollution fault which means it won't rev over 3k. On some DPF regens the glow plugs (as well as heated rear window, higher shift point in autos etc etc) are activated to put the engine under more load and therefore increase DPF temp. If the plugs can't be activated a sucessful regen can't take place and so rpm is limited.
Matt
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