This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.
Definition
P0753 is an OBD-II Code that refers to Shift Solenoid A Electrical/1-2 Shift Solenoid Circuit Electrical
Meaning
A P0753 code is a general diagnostic trouble code that occurs when the ECM/PCM detects an electrical abnormality in the shift solenoid A circuit. The shift solenoid is the automatic transmission’s key component that helps activate the vehicle’s controls for gear selection. For changes in the gear ratio (when the vehicle is driven, the PCM detects a discrepancy between the actual gear and what was expected) can activate the Error Code P0753 and trigger the Check Engine light.
Causes
Common causes for this code include:
- Transmission fluid that is of low or contaminated
- The transmission’s hydraulic system is obstructed
- Transmission failure due to a mechanical problem
- The transmission control module is faulty
- Bad PCM (rare)
Also read: How To Tell If A Hydraulic Lifters Is Bad?
Symptoms
The symptoms of a P0753 code are:
- Illuminated Check Engine Light
- Slipping in the transmission
- The transmission overheats
- Transmission catches in gear
- Fuel economy is poor
- Limp mode is activated
- Potential misfire-like symptoms
Diagnosis
To diagnose a P0753 DTC code, a technician would:
- Scan for codes in the ECM and look at the freeze frame data for failure.
- Visually inspect all shift solenoid wiring for shorts, bare wires, or other electrical issues.
- Check all fluid levels and condition of the transmission fluid.
- Check for any blockages in the transmission’s hydraulic system.
- With the engine running, check all voltages at each shift solenoid connector to make sure they are within specified ranges.
- If everything looks good so far, test drive the vehicle to see if the code returns.
Common mistakes
The following are some of the most common mistakes that a technician may make when diagnosing a P0753 code:
- Not thoroughly inspecting all the wiring and connectors for damage.
- Not checking the transmission fluid level or condition.
- Not testing all the shift solenoids for proper voltage.
- Failing to properly test drive the vehicle after repairs are completed.
How serious is this?
A P0753 code is a serious problem because it can cause the transmission to slip or not engage at all. This can lead to further damage to the transmission and result in a costly repair bill.
What repairs can fix the code?
The following are solutions that may fix this problem:
- Broken or faulty wirings must be repaired or replaced
- Clean corrosion from connectors
- Replace the transmission fluid and filter
- A transmission flush to clean passages
- Repair or replace a faulty transmission pump
- Replace faulty solenoid
- Repair or replace defective transmission valve body
- Flashing or replacing PCM
- Rebuild or install remanufactured transmission
Related codes
A P0753 is related to and may be accompanied by the following codes:
P0752 – Shift Solenoid B Electrical/2-3 Shift Solenoid Circuit Electrical
P0754 – Shift Solenoid C Electrical/3-4 Shift Solenoid Circuit Electrical
P0755 – Shift Solenoid D Electrical/4-5-6 Shift Solenoid Circuit Electrical
Conclusion
In conclusion, the P0753 code is a diagnostic trouble code that refers to a problem with the shift solenoid A circuit. This code is a serious problem because it can cause the transmission to slip or not engage at all. The most common cause for this code is a low or contaminated transmission fluid level. Other causes can include a faulty transmission control module, bad PCM, or a mechanical problem with the transmission. Be sure to have the vehicle’s transmission inspected and repaired by a certified technician as soon as possible to avoid further damage.