P0973
UniversalShift Solenoid A Control Circuit Low
Medium SeverityThis code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the control circuit for Shift Solenoid A. This typically results in automatic transmission shifting problems, which can affect vehicle performance and fuel economy.
⚠️ Before You Begin (Safety First)
Always wear appropriate safety gear, including gloves and eye protection, when working on your vehicle. Ensure the vehicle is properly supported on jack stands and the engine is off and cool. Disconnect the battery before performing any electrical repairs to prevent accidental short circuits or injury.
Common Symptoms
- Check Engine Light illuminated
- Transmission struggling to shift gears
- Harsh or delayed shifts
- Transmission stuck in a single gear (limp mode)
- Poor fuel economy
Common Causes
- Faulty Shift Solenoid A
- Open or short in the Shift Solenoid A control circuit wiring
- Corroded or loose electrical connector to the shift solenoid
- Low transmission fluid level or dirty transmission fluid
- Failed Powertrain Control Module (PCM), though less common
Frequently reported on: General/Universal, Ford F-150 (2004-2008), Chevrolet Silverado 1500 (2007-2013), Honda Accord (2003-2007), Toyota Camry (2002-2006)
Diagnostic Steps
- Verify the code with an OBD-II scanner and check for any other related transmission codes.
- Check transmission fluid level and condition. Top off or change if necessary.
- Inspect the wiring and connectors leading to Shift Solenoid A for any signs of damage, corrosion, or looseness.
- Using a multimeter, test for continuity and proper voltage at the Shift Solenoid A control circuit and the solenoid itself. Refer to your vehicle's service manual for specific values.
- If the solenoid tests faulty and wiring is intact, replacement of Shift Solenoid A may be necessary. This often involves dropping the transmission pan and draining fluid.
- Clear the code and retest the vehicle after any repairs.
👨🔧 When to Call a Professional
If diagnostic steps confirm an internal transmission issue or if you are uncomfortable dropping the transmission pan and dealing with transmission fluid, it is highly recommended to consult a certified transmission specialist. Improper transmission work can lead to further damage.
Commonly Asked Questions
What is Shift Solenoid A?
Shift Solenoid A is an electronic valve within your automatic transmission that controls the flow of transmission fluid to engage specific gears. It's crucial for smooth and proper gear changes.
Can I drive with a P0973 code?
Driving with this code is not recommended. It can lead to further transmission damage due to improper shifting and potentially unsafe driving conditions if the transmission unexpectedly shifts or gets stuck.
Is it possible for dirty transmission fluid to cause this code?
Yes, dirty or low transmission fluid can interfere with the proper operation of shift solenoids, potentially causing them to stick or report incorrect electrical readings, triggering a P0973 code.
Where is Shift Solenoid A located?
Shift Solenoid A is typically located inside the transmission, often on the valve body, which requires removing the transmission pan to access. Consult your vehicle's specific service manual for exact location.
Do I need to replace the whole transmission if I have a P0973 code?
Not necessarily. In most cases, the issue is a faulty solenoid, wiring, or fluid problem that can be repaired without replacing the entire transmission. Proper diagnosis is key.