DL501 TCM mechatronics repair

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From January 1st, 2026, we will be strictly Trade Only for New Zealand Info here

Price Exclusive of GST

Our minimum assessment fee is $150 + GST (Excluding Headlights) this just covers the time to check the unit over. If you go ahead with the repair, we’ll put this towards the total cost. Our full terms of trade is the link can be found here

International Customers:
When sending a unit from overseas, please declare it as “Repair and Return” with a low customs value (around $100 USD) to avoid unnecessary import fees. - All Repair Prices are quoted in NZD



Please only just send in the Control unit not the whole valve body !  

Common Failure symptoms:

  • No reverse gear
  • No gears above 1st
  • Gears sticking
  • No gears at all
  • Limp home mode
  • Harsh gear change
  • Jerking / behaving erratically

Common fault codes:

  • P0726 – RPM Signal Of Engine Control Unit (Implausible Signal)
  • P173C – Valve 1 In Sub-gearbox 1 (Electrical Fault)
  • P173F – Valve 2 In Sub-gearbox 1 (Electrical Fault)
  • P1740 – Clutch Temperature Monitoring
  • P174A – Valve 3 In Sub-gearbox 1 (Electrical Fault)
  • P174B – Valve 4 In Sub-gearbox 1 (Electrical Fault)
  • P174C – Valve 1 In Sub-gearbox 2 (Electrical Fault)
  • P174C – Valve 2 In Sub-gearbox 2 (Electrical Fault)
  • P174E – Valve 3 In Sub-gearbox 2 (Electrical Fault)
  • P174F – Valve 4 In Sub-gearbox 2 (Electrical Fault)
  • P176A – Gear Actuator/Selector 1 (Not Adjustable)
  • P176A – Selector 1 Cannot Be Regulated
  • P176B – Selector 2 Cannot Be Regulated
  • P176B – Gear Actuator/Selector 2 (Not Adjustable)
  • P179C – Main Pressure Valve (Electrical Fault)
  • P179D – Cooling Oil Valve (Electrical Fault)
  • P17D4 – Valve 2 in Sub-gearbox 1 (Mechanical Malfunction)
  • P17D4 – Valve 3 In Sub-gearbox 1 (Mechanical Malfunction)
  • P17D5 – Valve 3 in Sub-gearbox 2 (Mechanical Malfunction)
  • P17D6 – Clutch 1 Pressure Too High
  • P17D7 – Clutch 2 Pressure Too High
  • P17D8 – Torque Limitation Due To Clutch Temperature
  • P17E0 – Gear Actuator 1 Mechanical Error
  • P17E0 – Gear Actuator/Selector 1 (Mechanical Error)

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