Case IH 19229 – Engine Control Module (ECM) / Vehicle Control Module (VCM): Open load of powerstage of Charge Air Cooling Bypass Valve

This code indicates an open circuit in the powerstage (driver circuit) that controls the Charge Air Cooling (CAC) Bypass Valve. The engine control system has detected that the electrical circuit to the valve is incomplete, typically meaning a disconnected plug, a broken wire in the harness, or an internally open solenoid coil inside the valve.

• Tier 4b
• Case N-Series Tractor Loader Backhoes
• 580N
• 580SN
• 590SN

1. 1

   Inspect the wiring harness leading to the Charge Air Cooling Bypass Valve for chafed wires, rodent damage, or a disconnected plug

2. 2

   Disconnect the plug at the valve and inspect the pins for corrosion, moisture, or pushed-out terminals

3. 3

   Using a multimeter, measure the resistance across the terminals of the CAC Bypass Valve solenoid (an infinite/OL reading means the internal coil is open)

4. 4

   Check the continuity of the signal and ground wires from the valve connector back to the ECM pins to ensure there are no breaks in the wiring

1. 1

   Power Down

   Turn off the machine and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate the Valve

   Locate the Charge Air Cooling Bypass Valve, which is typically mounted near the intake manifold or along the charge air cooler piping.

3. 3

   Disconnect

   Unplug the electrical connector from the valve.

4. 4

   Harness Repair

   If the diagnostic checks revealed a broken wire, splice and seal the wire using OEM-approved heat-shrink connectors.

5. 5

   Valve Replacement

   If the valve is faulty, remove the mounting bolts or clamps securing the bypass valve to the charge air piping. Remove the faulty valve and clean the mating surfaces. Install the new valve with new gaskets/seals to prevent boost leaks. Torque the mounting hardware to OEM specifications.

6. 6

   Reassembly

   Reconnect the electrical connector to the valve.

7. 7

   Test

   Reconnect the battery. Use a CNH Electronic Service Tool (EST) or compatible diagnostic scanner to clear the 19229 fault code. Start the engine and verify that the code does not return under load.