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DTC codes / GM codes / P1740

P1740 · GMTorque Control/Management Request Circuit

P1740 on GM vehicles indicates that the transmission control module (TCM) has detected a fault in the torque control or torque management request circuit, which is used to momentarily reduce engine torque during shifts for smoother operation. The TCM monitors the circuit for expected electrical signals and sets this code when the signal is out of range or missing, often due to wiring or solenoid issues.

SystemPowertrain
Code typeGM specific
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • Illumination of the check engine light or service engine soon light
  • Harsh or delayed transmission shifts
  • Transmission may enter limp mode (stuck in a single gear)
  • Slight engine surging or hesitation during acceleration
  • Often no symptoms besides the warning light

Common causes, most likely first

  1. Faulty torque converter clutch (TCC) solenoid or torque management solenoid
  2. Damaged or corroded wiring in the torque control circuit
  3. Poor electrical connection at the transmission pass-through connector
  4. Failed transmission control module (TCM) or internal circuit fault
  5. Low transmission fluid level or contaminated fluid causing solenoid malfunction
  6. Sticking valve body or internal transmission mechanical issue affecting torque control

How to diagnose and fix it

  1. Check transmission fluid level and condition; top off or replace fluid if necessary
  2. Inspect the transmission wiring harness and connectors for damage, corrosion, or loose pins
  3. Test the torque management solenoid resistance and compare to factory specifications
  4. Check for power and ground signals at the solenoid connector with a multimeter or test light
  5. Repair or replace any damaged wiring or connectors in the torque control circuit
  6. Replace the faulty solenoid or valve body assembly if electrical tests indicate failure
  7. Clear the code and perform a relearn or adaptation procedure if required, then test-drive to verify

Don't overlook the wiring harness

  • A common cause of P1740 is a chafed or broken wire in the harness near the transmission, often overlooked when only the solenoid is replaced.
  • The code can be set by a faulty ignition switch or poor ground connection, so always verify power and ground integrity before condemning the TCM.
  • Some GM vehicles require a transmission adaptive relearn after repairs; failing to perform it can cause the code to return even with a new solenoid.
  • P1740 may be stored alongside other transmission codes like P0740 or P1860, which can help pinpoint the exact circuit fault.
  • A weak battery or charging system issue can cause erratic solenoid operation and set this code, so check battery voltage and connections first.

Can I keep driving with P1740?

You can usually drive the vehicle with P1740 set, but expect harsh shifts or reduced performance; avoid heavy acceleration and towing, and have it diagnosed soon to prevent further transmission damage.

Tools that help

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

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