Case IH 2494 (5937.15) - DEC – DEC (Drivetrain Electronic Controller): Clutch B pressure sensor stuck

A 'Clutch B pressure sensor stuck' condition indicates that the transmission control system is receiving a signal from the Clutch B pressure sensor that is out of its expected range, stuck at a specific voltage (often near the 5V reference or ground), or inconsistent with the commanded solenoid current. This typically points to an internal short or failure within the pressure sensor itself, a wiring harness issue, or a mechanical hydraulic fault.

• VESTRUM CVX
• Puma Series: 130, 145, 150, 160, 165, 170, 180, 185, 195, 200, 210, 215, 220, 230, 240
• Magnum Series: 180, 190, 200, 210, 220, 225, 240
• Maxxum & MXU Series: 110, 115, 125, 130, 140, 150

1. 1

   Read stored freeze-frame data and live PIDs with a diagnostic scan tool. Note the sensor voltage/value when the code was set.

2. 2

   Inspect the sensor connector (e.g., connector X547) and the wiring harness for chafing, melted wires, corrosion, or loose pins.

3. 3

   Backprobe the sensor connector with the key ON, engine OFF. Verify the 5V reference (often a Green wire, e.g., GN 7525), the sensor ground (often a Black/White wire, e.g., BK/WH 60), and the signal wire (often a Pink wire, e.g., PK 7785).

4. 4

   Check the transmission fluid level and condition. Look for contamination or metal debris that could cause a valve to stick.

1. 1

   Test the Sensor

   If the wiring, 5V reference, and ground test good, remove the Clutch B pressure sensor and bench-test it (or temporarily swap it with a known-good sensor).

2. 2

   Replace if Faulty

   If the sensor is internally shorted or stuck, replace it with a new OEM sensor.

3. 3

   Hydraulic Inspection

   If the sensor and wiring test good but the pressure PID remains inconsistent, inspect the hydraulic components. Check the hoses, fittings, valves, and the Clutch B solenoid for leaks or blockages.

4. 4

   Mechanical Pressure Test

   Measure the actual hydraulic pressure at the Clutch B pressure control union with an independent mechanical gauge to verify if the valve is physically stuck open.

5. 5

   Recalibrate

   After replacing the sensor or repairing the hydraulic circuit, clear the fault codes and perform a transmission calibration procedure to ensure proper clutch engagement.