P0968 — Pressure Control Solenoid “C” Control Circuit/Open #

Note: The wording of this DTC may vary depending on the vehicle manufacturer. Always check your OEM (Original Equipment Manufacturer) documentation for exact terminology.

• Ford: Pressure Control Solenoid “C” Control Circuit/Open
• GM/Chevrolet: Pressure Control Solenoid Valve “C” Control Circuit/Open
• Chrysler: Pressure Control Solenoid “C” Electrical
• Toyota: Shift Solenoid “C” Control/Open Circuit

Summary of Code P0968 #

P0968 is a diagnostic trouble code (DTC) that indicates the Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected an electrical open circuit in the Pressure Control Solenoid “C” control circuit. This solenoid is vital for regulating hydraulic pressure inside the automatic transmission, ensuring smooth shifting and protecting internal components. When this code is set, the transmission may enter fail-safe (limp) mode to prevent further damage. Recognizing and addressing this code promptly is crucial to avoid potential transmission issues or costly repairs down the line.

Common Symptoms for Code P0968 #

When P0968 appears, your vehicle may exhibit noticeable changes in driving behavior. The transmission relies on pressure solenoids for precise gear selection and shift quality. An open circuit in the solenoid can disrupt these functions, causing poor performance or even unsafe conditions. Typical symptoms include:

• Illuminated Check Engine Light (CEL)
• Harsh or delayed gear shifts
• Transmission stuck in a single gear (often 2nd or 3rd)
• Reduced fuel efficiency
• Limp mode activation (vehicle restricts gear options to prevent damage)
• Possible transmission overheating

Probable Causes for Code P0968 #

P0968 is an electrical fault, but its root cause can stem from several areas. Understanding the most frequent sources helps streamline the diagnostic process. Here are the most common causes, listed by likelihood:

1. Failed Pressure Control Solenoid “C”: The solenoid itself may be open internally due to wear or contamination.
2. Damaged or corroded wiring/connectors: Broken, shorted, or corroded wires in the solenoid control circuit are frequent culprits.
3. Faulty Transmission Control Module (TCM)/PCM: In rare cases, the control module may have an internal fault affecting solenoid control.
4. Blown fuse or relay: Electrical supply issues can prevent the solenoid from receiving power.
5. Internal transmission issues: Less commonly, mechanical failures can lead to electrical faults.

Step-by-Step Diagnostic Guide for P0968 #

A structured approach is essential for diagnosing P0968. Rushing to replace the solenoid without confirming the cause can lead to unnecessary expenses. Follow these steps:

1. Scan for additional DTCs: Check for related transmission or electrical codes that might help narrow down the issue.
2. Inspect transmission fluid: Verify that the fluid is clean, at the right level, and free of contaminants.
3. Visual inspection: Examine the wiring harness and connectors at the transmission for visible damage, corrosion, or loose connections.
4. Test solenoid resistance: Using a multimeter, check the resistance of Pressure Control Solenoid “C” at the connector. Compare to OEM specs.
5. Check for voltage and ground: With the ignition on, verify that control circuit wiring delivers proper voltage and ground to the solenoid.
6. Test continuity: Check the continuity between the TCM/PCM and the solenoid connector to rule out open circuits.
7. Bench test or swap solenoids (if accessible): Some techs may swap solenoids (if identical) to confirm the fault follows the part.
8. If all checks pass, test or replace the TCM/PCM: In rare cases, the module may be at fault and require professional evaluation or replacement.

Possible Repairs for P0968 #

The correct repair depends on the source of the open circuit. Addressing the root cause is critical for a lasting solution and to restore normal transmission operation. Common repairs include:

• Replace Pressure Control Solenoid “C”: If the solenoid fails resistance or function tests.
• Repair or replace damaged wiring/connectors: Fix any broken, shorted, or corroded wires and ensure secure, clean connections.
• Replace blown fuse or relay: Restore electrical supply to the solenoid circuit.
• Replace or reprogram TCM/PCM: If a confirmed control module failure is present.
• Transmission internal repair: Rarely, internal faults require further disassembly or rebuilding by a transmission specialist.

Is It Safe to Drive with Code P0968? #

Driving with P0968 is not recommended for extended periods. While you may be able to move the vehicle in limp mode, continued use can lead to transmission overheating, severe shifting issues, and potential internal damage. If you must drive, limit your distance, avoid heavy loads, and seek repairs as soon as possible to prevent costly transmission failure.

Vehicles Most Commonly Affected by P0968 #

P0968 is a generic OBD-II code found across many modern vehicles equipped with electronically controlled automatic transmissions. However, it appears most frequently in:

• Ford (F-150, Escape, Explorer)
• Chevrolet / GM (Silverado, Equinox, Malibu)
• Chrysler / Dodge (Grand Caravan, Ram 1500, Journey)
• Toyota (Camry, Corolla, Tacoma)
• Nissan (Altima, Sentra, Frontier)
• Honda (Accord, Civic, CR-V)
• Hyundai / Kia (Sonata, Santa Fe, Optima)

Common Mistakes & Best Practices for Code P0968 #

Misdiagnosis of P0968 often results from skipping key steps or neglecting simple causes. To avoid wasted time and money, always:

• Don’t replace the solenoid before testing wiring and connectors.
• Always check for related codes that may indicate broader transmission or electrical issues.
• Verify transmission fluid condition and level before electrical diagnosis.
• Consult OEM wiring diagrams to ensure accurate pin testing.
• Clear codes after repair and perform a proper road test to confirm a successful fix.

Fast FAQ for Code P0968 #

Here are quick answers to some common questions about this code:

• Q: Can a weak battery or alternator cause P0968?
  A: While low system voltage can cause multiple electrical codes, P0968 usually points directly to an issue with the solenoid circuit itself, not a general power problem.
• Q: Will clearing the code fix my transmission issue?
  A: Clearing the code will turn off the check engine light temporarily, but if the underlying problem remains, the code and symptoms will return quickly. Always address the root cause.