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DTC codes / Volkswagen codes / P1739

P1739 · VolkswagenTiptronic Switch Up Circuit Short To Ground

P1739 on Volkswagen vehicles means the transmission control module (TCM) has detected a short to ground on the circuit for the Tiptronic 'up' shift switch, which is the input used when the driver pushes the gear lever or steering-wheel paddle to request the next gear in manual mode. The TCM monitors the switch signal voltage and flags this code when that circuit is pulled to ground continuously or at an unexpected time, so the manual shift request cannot be trusted.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • The Tiptronic manual gate or steering-wheel paddle does not command an upshift, so the transmission stays in the current gear.
  • The gear position indicator may flash or show the wrong gear, and the transmission can default to a fixed gear or limp mode.
  • The manual shift function may work intermittently, often failing after the lever is moved or the steering wheel is turned.
  • The transmission may upshift on its own or refuse to hold a gear in manual mode.
  • Often no symptoms besides the warning light, especially if the short is intermittent and the TCM still sees valid switch signals most of the time.
  • A harsh or delayed shift may be noticed when the TCM substitutes a default shift strategy.

Common causes, most likely first

  1. Chafed or pinched wiring in the Tiptronic switch circuit where the harness passes through the gear lever boot or steering column, shorting the up-switch signal wire to ground.
  2. Moisture or contamination inside the Tiptronic switch assembly or the multi-function switch on the gear lever, bridging the up-switch contact to ground.
  3. A failed Tiptronic up switch or shift-paddle switch that is stuck closed or has internal contact bridging to its ground return.
  4. Corroded or loose terminals at the TCM connector or at the switch connector, allowing the signal wire to touch ground.
  5. A short inside the TCM itself, where the internal pull-up or input circuit for the up-switch has failed and holds the signal low.
  6. Aftermarket accessories or alarm wiring tapped into the console harness and accidentally grounding the Tiptronic signal wire.

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data for P1739, then clear the code and test-drive in Tiptronic mode to confirm whether the fault is hard or intermittent.
  2. Inspect the Tiptronic switch and gear lever boot for moisture, debris, or a stuck switch, and check that the up-switch contact opens and closes cleanly with a multimeter.
  3. Disconnect the TCM and the switch, then measure resistance from the up-switch signal wire to ground to check for a short in the harness; wiggle the harness through the lever boot and steering column while watching the meter.
  4. Check the switch ground return and the TCM connector pins for corrosion, pushed-back terminals, or loose fit, and repair any damaged pins.
  5. If the harness and switch test good, substitute a known-good Tiptronic switch or paddle switch and recheck the code before condemning the TCM.
  6. As a final step, test the TCM input circuit with a breakout box or oscilloscope to confirm the internal pull-up is functioning, and replace the TCM only if the short is proven inside the module.
  7. After repair, clear codes and verify with a road test that the up-shift request is recognised in measured value blocks and that P1739 does not return.

Tiptronic up-switch shorts that fool technicians

  • A very common miss is a chafed signal wire inside the gear lever boot that only shorts when the lever is pushed to the manual gate, so a static meter test on a parked car shows no fault.
  • The Tiptronic up switch shares a ground return with other console switches on many Volkswagen models, so a fault in an unrelated console switch can pull the up-switch signal low and set P1739.
  • Aftermarket radio or alarm installers often tap the console harness for an illumination or ground wire and accidentally create this exact short, so always check for non-factory wiring before replacing the switch.
  • P1739 does not always mean the switch is bad; a corroded TCM connector pin can hold the signal at ground and mimic a failed switch, so connector pin drag and corrosion checks are essential.
  • On some Volkswagen transmissions the TCM is integrated into the valve body or mechatronic unit, and a shorted internal input can set P1739 without any external harness fault, which is why module substitution should be the last step.

Can I keep driving with P1739?

You can usually drive the car, but the Tiptronic manual upshift may not work and the transmission can default to a limp or fixed gear, so avoid relying on manual mode and do not tow or drive aggressively until the short is repaired.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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