Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSJEEP2009COMMANDER LIMITED, 5.7 T, 4WDREPAIR AND DIAGNOSISBRAKESBRAKES CONTROL SYSTEMSFRONT CONTROL MODULE (FCM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGB2140-IGNITION START (REMOTE START) CONTROL CIRCUIT HIGHDIAGNOSTIC TEST

2009 Jeep Commander Limited, 5.7 T, 4WD

Diagnostic Test

2009 Jeep Commander Limited, 5.7 T, 4WDSECTION Diagnostic Test

CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
STARTER RELAY
1. Turn the ignition off.
2. Remove the Starter Relay.
3. Turn the ignition on.
4. With the scan tool, read the active FCM DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 3
  No
  - Replace the Starter Relay.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(F26) IGNITION SWITCH OUTPUT (START) CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Ignition Switch Output (Start) Circuit Shorted To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (F26) Ignition Switch Output (Start) circuit at the FCM C1 harness connector.
  Is the voltage above 10.0 Volts?
  
  Yes
  - Repair the (F26) Ignition Switch Output (Start) circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If OK, replace and program the Front Control Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.