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.
2009 Jeep Patriot Limited, ED3, AWD, StandardFACTORY OEM SERVICE PROCEDURE
Possible Causes
| Possible Causes |
|---|
| (D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT SHORT TO VOLTAGE |
| (D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT SHORT TO GROUND |
| (D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN OR HIGH RESISTANCE |
| (F202) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z904) GROUND CIRCUIT(S) OPEN OR HIGH RESISTANCE |
| (D508) COM-LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN |
| TIRE PRESSURE TRIGGER MODULE POWER AND GROUND |
| WIRELESS CONTROL MODULE (WCM) |
Factory Service Tools
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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.
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