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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (3.6L - DTCS P2138 To U1418) >> Diagnosis And Testing >> P258B-Electronic Vacuum Pump Performance >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
FUSED B+ CIRCUIT OPEN
ELECTRIC VACUUM PUMP OUTPUT CIRCUIT OPEN
ELECTRIC VACUUM PUMP OUTPUT CIRCUIT SHORTED TO GROUND
GROUND CIRCUIT OPEN
PINCHED, CUT OR OPEN VACUUM SUPPLY LINE
VACUUM PRESSURE SENSOR
BRAKE VACUUM BOOSTER
ELECTRIC VACUUM PUMP
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .