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 MANUALSJEEP2008GRAND CHEROKEE SRT-8REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROL(ANTI-LOCK BRAKE SYSTEM - ELECTRICAL DIAGNOSTICS)BRAKES - ELECTRICAL DIAGNOSTICSABSDTC TROUBLESHOOTINGU1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TCMDIAGNOSTIC TEST
2008 Jeep Grand Cherokee SRT-8
Diagnostic Test
2008 Jeep Grand Cherokee SRT-8SECTION Diagnostic Test
- CHECK IF FCM CAN BUS DTCS ARE PRESENT
With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTCs present?
Yes
- Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diagnose the appropriate symptom.
- Perform ABS VERIFICATION TEST .
No
- Go to 2.
- CHECK IF TRANSMISSION DTCS ARE PRESENT
With the scan tool, read Transmission DTCs.
Are there any Transmission DTCs present?
Yes
- Refer to the 21 - TRANSMISSION ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
- Perform ABS VERIFICATION TEST .
No
- Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Anti-Lock Brake Module per the Service Information.
- Perform ABS VERIFICATION TEST .
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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.