Fix P0965: Mechanic’s solutions that WORKED

The code P0965: Pressure Control Solenoid ‘B’ Control Circuit Range/Performance points out a fault in the Pressure Control Solenoid ‘B’, which plays a crucial role in managing the hydraulic pressure in the transmission. This issue is most likely caused by a problem with the solenoid itself, its electrical connections, or transmission fluid issues. It’s important to address this to maintain smooth shifting and overall transmission health.

P0965 quick overview

Meaning	P0965: Pressure Control Solenoid ‘B’ Control Circuit Range/Performance
Is it serious?	Yes, this code can be serious as it affects the vehicle’s transmission, potentially leading to shifting problems and driving discomfort.
Possible causes	– Faulty Pressure Control Solenoid ‘B’ – Wiring or connector issues to the solenoid – Transmission fluid problems (low level or dirty) – Transmission Control Module (TCM) software needing update – Overall transmission health issues
How to diagnose?	Inspect Solenoid: Check the Pressure Control Solenoid ‘B’ for any signs of damage or malfunction. Check Electrical Connections: Look over all wiring and connectors leading to the solenoid for damage or loose contacts. Evaluate Transmission Fluid: Ensure the transmission fluid is at the correct level and is clean. Update TCM Software: Verify if there are any software updates available for the Transmission Control Module. Assess Transmission: Conduct a thorough examination of the transmission to rule out other potential issues.

How to fix P0965 – learn from mechanics

I looked into P0965 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Nissan

Vehicle Information: 2012 Nissan Versa 1.6 S 1.6L – Transmission Issues

Issue + Repair History:

• Initially had a P0744 TCC solenoid code.
• Transmission acted erratically, leading to a decision to replace it.
• Multiple transmission replacements attempted, including two rebuilds and one new transmission.
• Encountered various codes like P0846 and P0965 during replacements.
• Tried replacing the valve body and TCM (Transmission Control Module), but issues persisted.

Other OBD2 Codes + Test Results:

• P0744 – Failed Converter Solenoid
• P0965 – Tested wiring, satisfactory results
• P0846 – Transmission Sensor B

Suggestions to Fix Issue:

• Use OEM parts for reliability.
• Check and ensure proper fluid levels and quality.
• Consider replacing the TCM if necessary.
• Verify the right transmission model is used.
• Inspect wiring and electrical connections thoroughly.

Final Fix: The final solution involved using the original valve body with a new wiring harness on the valve body. This approach addressed compatibility issues between the TCM and the valve body in the superceded transmission. After this change, the transmission was successfully reprogrammed, and a manual clutch point learn was conducted, resolving the issue.

Case #2: Nissan

Vehicle Information: 2012 Nissan Versa 1.6 S 1.6L

Issue + Repair History:

• CVT intermittently hunts for the right position at 35-40mph, causing RPM fluctuations.
• Fluid level checked at CVT temperature of 104°F and confirmed as correct.
• A used CVT with 16,000 miles was installed 11,000 miles ago.

Suggestions to Fix Issue:

• Thoroughly investigate if the issue is truly transmission-related.
• Consider the possibility of a power ground issue or other non-transmission related factors.
• Check if the problem is related to the MAF sensor.
• Confirm no unknown fluids or additives have been used in the transmission since installation.
• Explore the possibility of it being a valve body problem in the transmission.

Final Fix: The decision was made to replace the CVT transmission again with customer approval, considering the symptoms and consultation with a Nissan technician who confirmed no known TSBs or re-flashes addressing this problem.

Case #3: Cadillac

Vehicle Information: 2013 Cadillac XTS Livery 3.6L

Issue + Repair History:

• Shuddering under slight load, especially in 4th gear, with RPM fluctuations.
• Clean fluid, transmission serviced, coils, plugs, purge valve, and vacuum leaks repaired.
• No diagnostic codes after repairs.

Suggestions to Fix Issue:

• Check for transmission software updates addressing TCC shudder and shift quality.
• Consider the possibility of a torque converter issue.
• Evaluate whether the problem is due to high mileage and consider replacing the transmission.
• Use a scan tool to verify the latest software calibration for TCC shudder concern.

Final Fix: Replacing the transmission resolved the issue. The new transmission’s test drive confirmed the TCC engagement at the same RPM and MPH as the shudder started with the old transmission.

Case #4: Chevrolet

Vehicle Information: 2016 Chevrolet Malibu LT 2.0L Turbo

Issue + Repair History:

• The vehicle experienced harsh shifts and occasional stalling.
• Diagnostics revealed a P0965 code (Pressure Control Solenoid ‘B’ Control Circuit Range/Performance).
• Recently replaced transmission fluid and filter as part of regular maintenance.

Other OBD2 Codes + Test Results: P0965 – Pressure Control Solenoid ‘B’ Control Circuit Range/Performance

Suggestions to Fix Issue:

• Inspect and potentially replace the pressure control solenoid ‘B’.
• Check the wiring and connectors for the solenoid for any damage or loose connections.
• Perform a transmission fluid flush to ensure clean, adequate fluid is present.
• Consider updating the transmission control module (TCM) software, if available.

Final Fix: The issue was resolved by replacing the pressure control solenoid ‘B’. After replacement and clearing the code, the vehicle’s transmission operated smoothly with no further stalling or harsh shifts.

Case #5: Ford

Vehicle Information: 2018 Ford Escape SE 1.5L EcoBoost

Issue + Repair History:

• Driver reported intermittent jerking and delayed shifting.
• Code P0965 was detected during a routine scan (Pressure Control Solenoid ‘B’ Malfunction).
• Previous maintenance included regular transmission fluid changes and software updates.

Other OBD2 Codes + Test Results: P0965 – Pressure Control Solenoid ‘B’ Malfunction

Suggestions to Fix Issue:

• Thoroughly test the pressure control solenoid ‘B’ for proper operation.
• Examine all related electrical connections and wiring for signs of wear or damage.
• Evaluate the transmission fluid quality and level, considering another change if necessary.
• Inspect the transmission control module for any signs of malfunction or needed updates.

Final Fix: The problem was rectified by a combination of replacing the faulty pressure control solenoid ‘B’ and updating the TCM software. These actions led to an immediate improvement in shifting behavior and resolved the intermittent jerking issue.

Common Advice for P0965	Description of Diagnostic Step
Replace Pressure Control Solenoid ‘B’	If diagnostics indicate a malfunction, replace the solenoid responsible for controlling transmission pressure.
Check Wiring and Connectors	Inspect the wiring and connectors related to the Pressure Control Solenoid ‘B’ for any signs of damage, corrosion, or loose connections.
Perform Transmission Fluid Check/Change	Ensure the transmission fluid is clean and at the proper level, as dirty or low fluid can contribute to solenoid issues.
Update Transmission Control Module (TCM) Software	Check for any available software updates for the TCM, as updates may resolve electronic-related solenoid issues.
Inspect for Additional Transmission Issues	Evaluate the overall health of the transmission to rule out any other factors that may be contributing to the P0965 code.