Cummins ISB CM850 (2003-06) Fault Code: 2216 (ISB) PID: 94 SPN: 94 FMI: 0 Fuel pump delivery pressure – data valid but above normal operational range – moderately severe level. The ECM has detected fuel pressure in the fuel rail that is higher than the commanded pressure.

An electronic fuel control actuator with excessive leakage will result in high rail fuel pressures at idle or light load, and Fault Code 2216 will be logged. A restriction in the fuel-drain-to-tank return line can prevent excess fuel from exiting the high-pressure fuel pump. This excess drain fuel can enter the pumping chamber and pressurize the rail. Check the fuel drain line restriction. High resistance or an open circuit in the electronic fuel control actuator can cause this fault to log. Air in the fuel can result in pressure changes that would cause this fault to log. High low-pressure pump output pressure could cause this fault to log, as could tampering with the rail fuel pressure sensor.

Fault Code 2216 is activated whenever the engine is loaded (nonzero fueling) and measured fuel pressure is higher than the commanded fuel pressure.

If the drain line is restricted completely, the high-pressure fuel pump will fail, causing internal leakage. Prior to pump failure, fault codes indicative of a drain line restriction will occur. The Fault Codes are 449, 2216, or 2293. Following the failure, these fault codes will go inactive and Fault Code 2215, which is indicative of leakage, will be active. If troubleshooting Fault Code 2215 results in replacement of the pump and there are inactive counts of Fault Codes 449, 2216, or 2293, the drain line must be inspected and measured for restriction. This is to prevent repeat high-pressure pump failures.

Possible repiars:

1)Replace the sensor or repair the engine harness.
2)Replace the electronic fuel control actuator.
3)Replace the high-pressure injection pump.
4)Replace the fuel rail pressure relief valve.