OBD Guide
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P1779

Engine Torque Delivered To TCM Signal

P1779 is an OBD-II diagnostic trouble code meaning: Engine Torque Delivered To TCM Signal. Common causes: wiring problems between ecu and tcm, malfunction of torque sensors. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Incorrect gear shifting
  • Hard shifts
  • Switching delays
  • Reduced performance
  • Check Engine Light Illuminates

Causes

  • Wiring problems between ECU and TCM
  • Malfunction of torque sensors
  • Software errors in ECU or TCM
  • Mechanical problems in the transmission
  • Problems with control modules

How to Fix

  1. Check wiring integrity between ECU and TCM
  2. Scan both modules for errors
  3. Update ECU/TCM software
  4. Check sensors related to torque measurement
  5. Carry out diagnostics of the mechanical part of the transmission

Related codes

P1780P1778

Error P1779 by Vehicle Brand

BuickCadillacChevroletFordGMGMCJaguarLincolnMercuryOldsmobileSaturn

FAQ

What does the P1779 code mean?

P1779 is an OBD-II diagnostic trouble code that indicates: Engine Torque Delivered To TCM Signal

What causes a P1779 error code?

The most common causes of P1779 include: Wiring problems between ECU and TCM; Malfunction of torque sensors; Software errors in ECU or TCM; Mechanical problems in the transmission.

How do I fix a P1779 diagnostic trouble code?

To fix P1779: Check wiring integrity between ECU and TCM. Scan both modules for errors. Update ECU/TCM software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1779?

Limited driving only, diagnose soon

How much does it cost to fix P1779?

The estimated repair cost for P1779 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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