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Marty, Ford Technician
Category: Ford
Satisfied Customers: 576
Experience:  Ford Senior Certified. 20 years experience. Certified training in: driveability, electronics, etc.
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What does the tbc fault message mean?

Resolved Question:

what does the tbc fault message mean?
Submitted: 6 years ago.
Category: Ford
Expert:  Marty replied 6 years ago.

Marty :

Allow me to help in diagnosing your vehicle! If I helped make sure to hit ACCEPT button so as I can get credited.This is indicating a concern with the TBC (Trailer Brake controller) system. You will require to have the codes pulled from the module.

Customer : original concern is that the truck just stopped running tries to start but doesn't the process of trying to start it I got the above message. We have changed the batteries and both fuel filters but it still won't only has 30,000 miles on it. I haven't been driving it is my husband's truck and he is currently deployed to Iraq...can you tell me what else to try? Could it be the glo plugs?

Marty :

You will have to have the codes pulled from the powertrain modules to diagnose further. Here is a TSB for your vehicle for a no start but it will still have to have the codes pulled



Publication Date: June 11, 2010



2003-2005 Excursion
2003-2007 F-Super Duty
2004-2010 E-350, E-450


Some 2003-2007 F-Super Duty, 2003-2005 Excursion and 2004-2010 E-Series vehicles equipped with a 6.0L engine may exhibit a runs rough, lacks power, hard start, no start concern with or without diagnostic trouble code (DTC) P0611 code or various injector circuit codes. This concern may be caused by a DC-DC converter located in one half of the Fuel Injector Control Module (FICM) or by the main circuit board in the other half of the FICM.


Follow the Service Procedure steps to correct the condition.


FICM Information:

The FICM contains two major internal components, the main circuit board and a DC-DC converter. The DC-DC converter is the device that amplifies battery voltage to 48 volts to operate the injectors.

Low FICM supply voltage results in increased FICM operating loads, potentially damaging or shortening the life of the FICM.

For contribution codes without circuit codes, go to Powertrain Controls/Emissions Diagnosis (PC/ED) pinpoint test P. Do not continue with this procedure.

  1. Connect Integrated Diagnostic System (IDS) scan tool and confirm battery voltage is greater then 11.5 volts key on engine off (KOEO).

    1. If battery voltage is less then 11.5 volts KOEO, do not continue with this article. Refer to Workshop Manual (WSM), Section 414-00.

    2. If battery voltage is 11.5 volts KOEO or higher, continue to Step 2.

  2. Remove the FICM relay.

  3. Perform a programmable module installation (PMI) on the FICM to correct possible corrupt FICM memory.

    1. IDS scan tool software must be at release level 65.18, or higher.

    2. Select module programming on the IDS menu screen.

    3. Select PMI and click on the tick button at the bottom right corner of the screen.

    4. Follow the directions on the screen until it states to install the new module. At this point, click on the tick button again and continue to follow the on screen directions to complete the PMI procedure.

  4. Reinstall the FICM relay.

  5. Monitor the FICM_M power parameter identification (PID) per the following instructions:

    1. Disconnect the glow plug control module (GPCM) VPWR circuit to isolate the GPCM and alternator from the FICM and provide more consistent FICM testing. (Figure 1)

      Figure 1 - Article 10-12-6

    2. Disconnect the fuel heater relay, if equipped.

    3. With IDS already installed, turn ignition to run position.

  6. Monitor engine oil temperature (EOT) PID.

    1. If EOT reads 32 °F (0 °C) or less, proceed to Step 11

    2. If EOT reads greater than 32 °F (0 °C), proceed to Step 7.

  7. Turn ignition off.

  8. Disconnect the EOT sensor.

  9. Using Rotunda Technician Tool Program Universal Gauge and Component Tester (OTC3385) or equivalent, adjust setting to 100,000 ohms resistance. Verify tester resistance using a digital volt ohm meter (DVOM) with 10 mega ohm minimum impedance.

  10. Connect the instrument gauge system tester between the EOT signal and SIGRTN circuits at the harness side of the EOT connector.

    1. Failure to apply exactly 100,000 ohms of resistance at this location may result in inaccurate test results.

  11. With key on and engine off, monitor the FICM_MPWR PID and record the value.

  12. Cycle the ignition to off and back to run position to activate the injector pre-cycle. Monitor the FICM_MPWR PID and ensure voltage reading is greater than 45 volts during the entire duration of the last 10 seconds of the fuel injectors clicking.

    1. If FICM_M power is 45 volts or greater, the PMI repaired the concern. Reassemble the EOT circuits if previously removed. Return vehicle to customer.

    2. If FICM_MPWR drops below 45 volts during pre-cycle, reassemble the EOT circuits if removed previously and proceed to FICM Half Shell Replacement procedure.

FICM Half Shell Replacement

Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage can result. Extreme care should be taken when performing this repair.

  1. Remove FICM from the vehicle and clean off any debris using shop air. Refer to WSM, Section 303-14B.

  2. Remove the two (2) Torx T20 retaining screws and inspection plate from the back of the FICM. (Figure 2)

    Figure 2 - Article 10-12-6

  3. Inspect the buss connector screws.

    1. If FICM is an early style with seven (7) connector screws, do not disassemble. Replace the FICM assembly. (Figure 3)

      Figure 3 - Article 10-12-6

    2. If FICM has four (4) connector screws, proceed to Step 4 for inspection and repair. (Figure 4)

      Figure 4 - Article 10-12-6

  4. Remove the four (4) Torx T10 buss post retaining screws . (Figure 4)

    1. When removing the screws from the FICM, you may find metallic shavings. Be sure to clean any debris from the screws before reinstalling.

  5. Remove the eight (8) Torx T20 half shell retaining screws.

  6. Carefully separate the top and bottom half shells of the FICM. The upper half (with the three main FICM harness connectors) contains the main circuit board. The lower half contains the DC-DC board. They are sealed by a molded perimeter gasket. Gentle prying may be required to separate. Retain the gasket for reuse.

  7. Inspect the main circuit board for burning and/or damaged components

    1. If any evidence of loose or burned components is found, replace the FICM assembly.

    2. If no evidence of loose or burned components are found, proceed to Step 8.

  8. Install the original half shell gasket that was removed in Step 6 in the new lower FICM half shell.

    1. Before putting the two FICM half shells together, be sure to clean any dust or debris using compressed air.

  9. Assemble the upper and lower FICM half shells. Install eight (8) case screws and torque to 18 lb-in (2 N-m).

  10. Install the four (4) buss screws removed in Step 4 and torque to 9 lb-in (1 N-m)

  11. Install inspection plate, seal and retaining screws and torque to 18 lb-in (2 N-m).

  12. Install four (4) replacement mounting grommets.

  13. Install FICM. Refer to WSM, Section 303-14B.

  14. Clear all DTCs.

4C3Z-12B599-BARMFICM Half Shell


Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

101206A2004-2010 Econoline 6.0L: Perform PMI, Resistor Installation Not Necessary (Do Not Use With Any Other Labor Operations)0.5 Hr.
101206B2004-2010 Econoline 6.0L: Perform PMI, Resistor Installation Necessary (Do Not Use With Any Other Labor Operations)1.1 Hrs.
101206C2004-2010 Econoline 6.0L: Perform PMI, Resistor Installation Not Necessary, Replace FICM Half Shell Or Entire FICM (Do Not Use With Any Other Labor Operations)1.1 Hrs.
101206D2004-2010 Econoline 6.0L: Perform PMI, Resistor Installation Necessary, Inspect And Replace FICM Half Shell Or Entire FICM (Do Not Use With Any Other Labor Operations)1.8 Hrs.
101206E2003-2007 F-Super Duty 6.0L: Perform PMI Install Resistor If Necessary (Do Not Use With Any Other Labor Operations)0.5 Hr.
101206F2003-2007 F-Super Duty 6.0L: Perform PMI, Install Resistor If Necessary, Inspect And Replace FICM Half Shell Or Entire FICM (Do Not Use With Any Other Labor Operations)1.7 Hrs.


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