Bad news I'm afraid. Problem has returned. I swapped the suspect BCU for a good BCU from another Vogue of the same year and build and programmed it as required. Even with the working BCU from another car, the steering has gone heavy again after a week of being fine. The car which received...

Considering that was your 666th post, I believe you :D

Think I solved it :) Do I post the solution? Or don't i? Used IDS to reflash the BCU back to AsBuilt spec. Then reflashed the module that contains the AsBuilt information based on all the modules the car had fitted, then flashed the BCU again. Been fine for a week now, steering problem...

Yup that's me. Plugged IDS into the car this morning and did pinpoint test on the BCU. Came up with a fault code P0083 cable tachometer A (speedometer) or instrument cluster signal is implausible. But not sure if this is from me unplugging everything or what is actually causing the issue...

No, but the problem is electrical. Scoping the GEM (known as BCU on pre07MY) shows the output to the servotronic valve drops when the steering is heavy. If power steering fluid was the problem then the GEM output would be proportional to the speed of the car

SnapOn Modis Ultra. Ignition switch has 12v and auxiliary and ignition. These both drop to 7v when cranking, but the crank wire gets full 12v. What usually fails with the ignition switch? How could it be linked to heavy steering?

Thanks, but pretty obvious. If you can tell me 'how' to diagnose the problem then that would be useful. I've already checked for DTCC codes on all modules, checked for continuity between the BCU and servotronic valve (connector C0662, pins 9 and 11) and the speed wire from the ABS module...

No haven't tried that, but will do. I found reference to another owner who solved his problem by greasing the steering knuckle between the column and the rack. I didn't think this would be a problem but his steering would be light sometimes andf heavy at others so it's worth investigating. As...

I have a problem with my 2007 TDV8 Vogue. The power steering is heavier than it should be (and compared to my other TDV8 vogue). Had the car a month and issue has been there since I bought it (it was very cheap so couldn't say no). Symptons: Steering is heavy regardless of engine speed Road...