P0973 Code: Here's How to Solve It Fast

The P0973 trouble code is a diagnostic trouble code (DTC) that indicates a problem with the "Shift Solenoid A Control Circuit Low." This code is primarily associated with automatic transmission systems and is triggered when the Transmission Control Module (TCM) detects an abnormal reading from the shift solenoid A. The shift solenoids play a crucial role in controlling hydraulic pressure within the transmission, which is essential for smooth gear shifting. Understanding this code is vital for vehicle owners and DIY mechanics, as it can lead to significant drivability issues if not addressed promptly.

P0973 Code Meaning	P0973 Code Common Causes
Shift Solenoid A Control Circuit Low	Faulty shift solenoid valve A
Abnormal readings from the TCM	Defective wiring or connectors in the circuit
Transmission fluid issues	Low or contaminated transmission fluid
Potential TCM or PCM failure (rare)	Faulty control circuit components

Symptoms of P0973 Code

When the P0973 code is triggered, vehicle owners may notice several symptoms that indicate a problem with the transmission system:

• Check Engine Light: The most immediate sign of a P0973 code is the illumination of the check engine light on the dashboard.
• Harsh Shifting: Drivers may experience rough or harsh shifting between gears, which can lead to an uncomfortable driving experience.
• Inability to Shift Gears: In more severe cases, the vehicle may struggle to shift into certain gears or may not shift at all.
• Reduced Fuel Efficiency: Abnormal transmission behavior often leads to decreased fuel economy as the engine works harder to compensate for shifting issues.
• Irregular Acceleration: Drivers might notice uneven acceleration, which can be frustrating and potentially dangerous.

Technical Explanation of P0973 Code

The P0973 code is classified as a generic OBD-II trouble code, meaning it applies to all vehicles manufactured after 1996 equipped with OBD-II systems. The "P" in the code signifies that it pertains to powertrain issues, specifically related to the engine and transmission.

The TCM uses input from various sensors and solenoids to manage gear shifts effectively. When it detects that the readings from shift solenoid A are outside normal parameters—indicating either too low voltage or an open circuit—it triggers the P0973 code. This can occur due to several reasons, including:

• Faulty Shift Solenoid: The solenoid itself may be defective, causing improper operation.
• Wiring Issues: Damaged or corroded wires and connectors can disrupt communication between components.
• Fluid Problems: Insufficient or dirty transmission fluid can hinder solenoid function.
• Control Module Failures: Although rare, failures in the TCM or Powertrain Control Module (PCM) can also trigger this code.

Step-by-Step Diagnosis of P0973 Code

Diagnosing a P0973 code involves several systematic steps:

1. Use an OBD-II Scanner: Start by connecting an OBD-II scanner to retrieve the trouble codes stored in the vehicle's computer. Note any additional codes present, as they may provide further insight into underlying issues.
2. Check Freeze Frame Data: Review freeze frame data associated with the P0973 code. This data captures vehicle conditions at the time of the fault, aiding in diagnosis.
3. Visual Inspection: Inspect wiring and connectors related to shift solenoid A for signs of damage, corrosion, or loose connections. Repair any issues found.
4. Transmission Fluid Check: Assess the transmission fluid level and condition. If it's low or contaminated, replace it with fresh fluid according to manufacturer specifications.
5. Test Shift Solenoid A: Use a digital volt/ohmmeter (DVOM) to test the resistance of shift solenoid A. Compare readings against manufacturer specifications; if out of range, replace the solenoid.
6. Inspect Control Modules: If all previous checks are satisfactory but the code persists, consider testing or replacing the TCM or PCM as necessary.
7. Clear Codes and Test Drive: After repairs are made, clear all codes from the system and take the vehicle for a test drive to ensure proper operation and verify that no codes reappear.

Solution Methods for P0973 Code

Addressing a P0973 trouble code typically involves one or more of the following solutions:

• Replace Shift Solenoid A: If testing reveals that the solenoid is faulty, replacing it will often resolve the issue.
• Repair Wiring and Connectors: Any damaged wiring or connectors should be replaced to restore proper electrical communication within the circuit.
• Change Transmission Fluid: If fluid levels are low or if contamination is present, changing out old fluid for new can improve solenoid performance and overall transmission function.
• Control Module Replacement: In rare cases where other solutions fail, replacing a faulty TCM or PCM may be necessary.

Cost Estimates for Repairs

The cost of repairing a P0973 trouble code can vary widely depending on several factors:

• Shift Solenoid Replacement: This typically costs between $100 and $300 for parts and labor combined.
• Wiring Repairs: Depending on damage severity, wiring repairs may range from $50 to $200.
• Transmission Fluid Change: A fluid change usually costs between $75 and $150 depending on fluid type and labor rates.
• Control Module Replacement: This can be more expensive, ranging from $300 to over $1,000 depending on make and model.

Warnings and Recommendations

When dealing with a P0973 trouble code:

• Do Not Ignore Symptoms: Ignoring this code can lead to severe transmission damage over time due to improper shifting behavior.
• Follow Proper Diagnosis Protocols: Ensure that all diagnostic steps are followed meticulously to avoid unnecessary parts replacement.
• Seek Professional Help When Needed: If you're unsure about any step in diagnosing or repairing this issue, consult a certified mechanic for assistance.

Closing Paragraph

The P0973 trouble code signifies an important issue within your vehicle's transmission system that should not be overlooked. Understanding its causes, symptoms, and solutions empowers vehicle owners and DIY mechanics alike to address potential problems proactively. By following proper diagnostic procedures and taking timely action, you can maintain your vehicle's performance and avoid costly repairs down the line. Always prioritize safety and consider professional help when necessary to ensure your vehicle remains reliable on the road.

Frequently Asked Questions About P0973

• What does error code P0973 mean?
  P0973 indicates that there is a problem with Shift Solenoid 'A' Control Circuit Low in your vehicle's transmission system.
• Can I drive my car with a P0973 code?
  While driving is permitted short distances, it's advisable to repair it as soon as possible to avoid further damage.
• What causes a P0973 trouble code?
  The most common causes include a faulty shift solenoid A, damaged wiring or connectors, low transmission fluid levels, or issues with control modules.
• How do I fix error code P0973?
  Fixing this error typically involves replacing the shift solenoid A, repairing wiring issues, changing contaminated fluid, or replacing faulty control modules.
• Will clearing the error codes fix my car?
  Clearing codes alone won't fix underlying issues; proper diagnosis and repairs must follow.
• How much does it cost to repair a P0973 code?
  The total cost can range from $100 for minor repairs up to over $1,000 for more extensive work like control module replacement.
• Is it safe to ignore a P0973 code?
  No; ignoring this issue can lead to serious transmission problems that may result in costly repairs.
• What tools do I need to diagnose error code P0973?
  A basic OBD-II scanner is essential for reading codes; additional tools like DVOM may be needed for electrical testing.