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Home/Cars/GMC/Sierra/T1XX (2019-Present)/my GMC Sierra T1XX (2019-Present) has a check engine light with codes P0751 to P0758 what does this...

my GMC Sierra T1XX (2019-Present) has a check engine light with codes P0751 to P0758 what does this...

GMC Sierra T1XX (2019-Present)

Error Codes
Severity: highDifficulty: mediumError Code: P0751-P07583-5 hours
3 min read
509 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0751-P0758 transmission shift solenoid issues in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0751-P0758
Affected Component
Transmission
Estimated Time
3-5 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Allow the engine to cool before opening the transmission pan to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Harsh or erratic shifting
  • •Delayed engagement when shifting from park to drive or reverse
  • •Poor acceleration
  • •Transmission overheating

Diagnostic Steps

  1. 1Scan the vehicle's computer using an OBD-II scanner to confirm the codes P0751 to P0758 and check for any additional codes.
  2. 2Inspect the transmission fluid level and condition; low or dirty fluid can affect solenoid operation.
  3. 3Visually inspect the transmission wiring harness and connectors for damage or corrosion.
  4. 4Test the resistance of each shift solenoid according to specifications using a multimeter.
  5. 5Check for mechanical issues in the transmission that could cause shifting problems, such as a clogged filter or worn components.
  6. 6Clear the codes and take the vehicle for a test drive to see if the codes reappear.

Solution

Solution

1. Preparation

  • Gather tools and parts needed.
  • Ensure the vehicle is parked on a level surface and the engine is off.
  • Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Shift Solenoids

  • Tools Required: Socket set, ratchet, multimeter, torque wrench, transmission fluid, and a new filter if necessary.
  • Sub-steps:
    1. Remove the transmission pan by loosening the bolts with a socket set. Be cautious of fluid spillage.
    2. Once the pan is removed, inspect the filter; if it appears clogged, replace it.
    3. Locate each shift solenoid on the valve body; they are typically secured with bolts.
    4. Disconnect the electrical connectors from the solenoids.
    5. Remove the faulty solenoids by unbolting them and replacing them with new ones, ensuring they are torqued to manufacturer specifications.
    6. Reinstall the transmission pan with a new gasket to prevent leaks and torque the bolts to specifications.

3. Refill Transmission Fluid

  • Sub-steps:
    1. Refill the transmission with the recommended fluid type using a funnel.
    2. Start the engine and allow it to reach operating temperature.
    3. Shift through all gears to circulate the fluid, then check the fluid level with the dipstick, adding more fluid if necessary.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Socket set
  • •Ratchet
  • •Multimeter
  • •Torque wrench
  • •Funnel

Parts Required

  • •Shift solenoids (P0751-P0758)
  • •Transmission fluid
  • •Transmission filter (if necessary)
  • •Gasket for transmission pan

Additional Information

Error Code
P0751-P0758
Affected Component
Transmission
Estimated Time
3-5 hours
Difficulty
medium
Severity
high
Tools Required
6 items
Parts Required
4 items

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