What are the common transmission error codes for the Chevrolet Silverado 1500 T1XX?

Common Transmission Error Codes for Chevrolet Silverado 1500 T1XX (2019-2023)

The Chevrolet Silverado 1500 T1XX series, produced from 2019 to 2023, may experience various transmission-related error codes. Below is a list of common error codes, their symptoms, potential causes, and diagnostic steps.

Common Error Codes

1. P0700 - Transmission Control System (Malfunction)

   • Symptoms: Check engine light, erratic shifting, delayed engagement.
   • Potential Causes: Faulty transmission control module (TCM), wiring issues, or internal transmission problems.

2. P0715 - Input/Turbine Speed Sensor A Circuit Malfunction

   • Symptoms: Harsh shifts, engine revs without vehicle speed increase.
   • Potential Causes: Faulty input speed sensor, damaged wiring, or poor connections.

3. P0720 - Output Speed Sensor Circuit Malfunction

   • Symptoms: Slipping transmission, incorrect gear ratio, check engine light.
   • Potential Causes: Faulty output speed sensor, wiring issues, or a malfunctioning TCM.

4. P0750 - Shift Solenoid A Malfunction

   • Symptoms: Erratic shifting, slipping, or no engagement into gear.
   • Potential Causes: Defective shift solenoid, poor electrical connections, or wiring issues.

5. P0755 - Shift Solenoid B Malfunction

   • Symptoms: Harsh shifting, inability to shift into certain gears.
   • Potential Causes: Faulty shift solenoid B, wiring problems, or TCM issues.

6. P0760 - Shift Solenoid C Malfunction

   • Symptoms: Delayed or harsh shifting, slipping transmission.
   • Potential Causes: Faulty shift solenoid C, damaged wiring, or TCM failure.

7. P0841 - Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance Problem

   • Symptoms: Slipping, harsh shifting, or no shifting at all.
   • Potential Causes: Faulty transmission fluid pressure sensor, wiring issues, or low transmission fluid.

Repair Instructions

1. Replacing Sensors or Solenoids

   • Tools Required: Socket set, screwdrivers, new parts (sensors or solenoids).
   • Instructions:
     • Disconnect the battery.
     • Remove the necessary components to access the faulty sensor or solenoid.
     • Disconnect the wiring harness and remove the old component.
     • Install the new sensor/solenoid and reconnect the wiring.
     • Reassemble any components that were removed and reconnect the battery.

2. Repairing Wiring Issues

   • Tools Required: Electrical repair kit, soldering iron, heat shrink tubing.
   • Instructions:
     • Locate the damaged wiring or connectors.
     • Cut out the damaged section, strip the ends, and splice in new wiring using solder and heat shrink tubing.
     • Ensure all connections are secure and insulated.

3. Flushing and Filling Transmission Fluid

   • Tools Required: Transmission fluid, fluid pump, drain pan.
   • Instructions:
     • Drain the old transmission fluid into a drain pan.
     • Use a fluid pump to refill the transmission with new, manufacturer-recommended fluid.
     • Check the level with the engine running and the transmission in park, adding fluid as necessary.

4. Reprogramming or Replacing TCM

   • Tools Required: Professional diagnostic tool or TCM reprogramming tool.
   • Instructions:
     • If the TCM is confirmed faulty, replace it with a new one.
     • Use a professional diagnostic tool to program the new TCM according to manufacturer specifications.

Conclusion

After completing the necessary repairs, clear the error codes using the OBD-II scanner and perform a test drive to ensure the transmission operates correctly. Continuous monitoring may be required to ensure the issue does not recur. If problems persist, further diagnosis may be needed to inspect the internal transmission components.