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SPN 2791 FMI 5

EGR Valve Control — Current below normal or open circuit.
Less current is flowing in an output or sensor circuit than expected, which usually means the circuit is open.

What the SPN covers: The output circuit the engine computer uses to drive the EGR valve. More on SPN 2791.

What FMI 5 usually points to: Broken wire, unplugged connector, burned-out coil or solenoid, or a backed-out terminal. More on FMI 5.

Severity

MEDIUM — fix soon

Expect reduced performance and higher soot until fixed.

Likely causes

  1. Wiring or connector fault in this circuit (most common for electrical FMIs)
  2. EGR valve motor/solenoid failure
  3. Wiring open or short
  4. Valve stuck with carbon

Checks & fixes (easiest first)

  1. Inspect the connector and harness for this circuit: corrosion, water, chafing, backed-out pins
  2. Check the reference voltage, ground and signal at the component per OEM pin-out
  3. Check the control circuit for opens/shorts
  4. Command the valve with a scan tool
  5. Inspect and clean the valve

FAQ

What does SPN 2791 FMI 5 mean?

EGR Valve Control — current below normal or open circuit. Less current is flowing in an output or sensor circuit than expected, which usually means the circuit is open.

Is SPN 2791 FMI 5 serious?

Expect reduced performance and higher soot until fixed.

What should I check first for SPN 2791 FMI 5?

Inspect the connector and harness for this circuit: corrosion, water, chafing, backed-out pins; Check the reference voltage, ground and signal at the component per OEM pin-out; Check the control circuit for opens/shorts.