JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
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  • Load image into Gallery viewer, JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
  • Load image into Gallery viewer, JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)
  • Load image into Gallery viewer, JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)

JB4 Plug-and-Play Piggyback ECU Tuning Box for GMC Sierra 1500 2.7L Turbo (2019 Onwards)

£687.70
£687.70
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Unlock serious, safe performance from your 2019 onwards GMC Sierra 1500 2.7L Turbo with the JB4 plug and play tuner from Nforcd. This proven piggyback ECU upgrade works alongside the factory calibration to optimise boost, timing and fuelling for sharper response and reduced turbo lag, delivering gains of up to 85whp and 120wtq to the wheels on a stock truck without flashing.

  • Plug and play installation to two accessible engine bay sensors, discreet fitment with a rugged billet aluminium JB4 enclosure
  • CANbus OBDII integration for real-time tuning using ECU data including pedal and throttle position, timing, fuel trims, air fuel ratio, knock and gear
  • Preloaded maps for 91 octane, 93 octane, factory, Valet mode, E85 blends and unleaded race fuel, plus boost by gear for improved launches
  • Read and clear fault codes, view and log up to 40 engine parameters with the JB4 app
  • Optional Bluetooth smartphone connectivity via the JB4 PRO adapter for wireless map switching, data logging and free firmware updates
  • Not VIN locked, fully removable without trace, factory-like drivability and compatible with all driving modes including towing
  • Made in the USA with a 5-year warranty
  • Fuel economy unchanged during normal driving, 91 octane or better recommended for performance gains

Vehicle fitment: GMC Sierra 1500 2.7L Turbo, 2019 onwards.

The JB4 tuning box is a popular choice with Nforcd customers who want a reversible, aftermarket upgrade that offers more functionality and safety than basic performance chips. It delivers smooth, repeatable power with the convenience of map switching and comprehensive data logging, all while keeping the factory ECU untouched.

Nforcd can supply and fit this JB4 at our Warwickshire facility. If you would like professional installation, request a fitting quote via Sales@nforcd.com. Order today and transform the way your Sierra drives.