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 MANUALSJEEP2008LIBERTY SPORT, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDTCS P2138 TO U110EP2172-HIGH AIRFLOW / VACUUM LEAK DETECTED (INSTANTANEOUS ACCUMULATION)POSSIBLE CAUSES
2008 Jeep Liberty Sport, RWD, Automatic
Possible Causes
2008 Jeep Liberty Sport, RWD, AutomaticSECTION Possible Causes
| Possible Causes |
|---|
| VACUUM LEAK |
| RESISTANCE IN THE (K857) 5-VOLT SUPPLY CIRCUIT |
| (K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT |
| (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND |
| RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT |
| RESISTANCE IN THE (K855) 5-VOLT SUPPLY CIRCUIT |
| (K855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| RESISTANCE IN THE TP SENSOR SIGNAL CIRCUIT |
| TP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND |
| RESISTANCE IN THE (K922) TP SENSOR GROUND CIRCUIT |
| MAP SENSOR |
| THROTTLE BODY/TP SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.
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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.