What Does P1769 Mean?
The AG4 transmission torque modulation system has detected a fault preventing proper engine torque reduction during shift events. This can cause harsh or abrupt gear changes.
Common Causes
35%
Communication fault between TCM and engine control module
25%
Engine control module not responding to torque reduction requests
20%
TCM internal fault in torque request circuit
15%
Damaged or corroded communication network connectors
5%
Software calibration mismatch between ECM and TCM
Diagnostic Steps
1
Step 1: Verify CAN bus communication between ECM and TCM using scan tool (check for communication DTCs)
2
Step 2: Monitor torque reduction requests and actual engine torque response during gear shifts using scan tool
3
Step 3: Inspect CAN bus wiring and termination resistors for proper resistance (typically 60 ohms across CAN Hi/Lo)
4
Step 4: Check for ECM and TCM software updates or technical service bulletins addressing torque modulation
5
Step 5: Test CAN bus signal integrity with oscilloscope if communication issues persist
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The AG4 transmission torque modulation system has detected a fault preventing proper engine torque reduction during shift events. This can cause harsh or abrupt gear changes.
The most common cause of P1769 (AG4 Transmission Torque Modulation Fault) is: Communication fault between TCM and engine control module
Typical repair costs for P1769 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission shifts may be harsh or abrupt, causing passenger discomfort and accelerated clutch wear. Vehicle remains drivable but shift quality is compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1769 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
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