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Detroit Fault Codes SPN 51/FMI 3 – EPA07 – EPA10 – GHG14

21/11/2025
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SPN 51/FMI 3 - EPA07 - EPA10 - GHG14
Intake Throttle Valve Circuit Failed High
SPN 51/FMI 3
Description This Fault Code Sets When There Is A Short To Voltage On The Intake Throttle Valve Circuit
Monitored Parameter Intake Air Throttle
Typical Enabling Conditions Key On
Monitor Sequence None
Execution Frequency Always Enabled
Typical Duration 2 Seconds
Dash Lamps MIL, CEL
Engine Reaction Derate 10%
Verification Engine Idle (1 minute)
SPN 51/FMI 3 - EPA07 - EPA10 - GHG14

Possible causes:

1. Connect DiagnosticLink® .

2. Turn the ignition ON (key ON, engine OFF).

3. Check for multiple fault codes. Is fault code 3509 FMI 3 also present?1.

3.1 Yes; diagnose fault code SPN 3509/FMI 3.

3.2 No; Go to step 4.

4. Disconnect and inspect the Intake Throttle Valve (ITV) electrical connector. Is there any damage or corrosion present?

4.1 Yes; repair as necessary.

4.2. No; Go to step 5.

5. Turn the ignition ON (key ON, engine OFF).

6. Recheck for the fault code. Did SPN 51 FMI 3 become inactive and fault code SPN 51 FMI 4 become active?1.

6.1 Yes; replace the ITV. Refer to section “Removal of the Intake Throttle Valve and Adaptor” .

6.2 No; Go to step

7. Turn the ignition OFF.

8. Disconnect and inspect the MCM 120-pin electrical connector. Is the MCM connector damaged?1.

8.1 Yes; repair as necessary.

8.2 No; Go to step 9.

9. Turn the ignition ON (key ON, engine OFF).

10. Recheck for the fault code. Is SPN 51 FMI 3 still present?1.

10.1 Yes; replace the MCM. Refer to section “Removal of the Motor Control Module” .

10.2 No; repair the circuit between pin 1 of the ITV electrical connector harness side and pin 90 of the 120- pin MCM electrical connector harness side.

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