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2002 Jeep Grand Cherokee 4.0L Ignition System Fault: P0351-P0353 Misfires and Starting Issues After Crankshaft Position Sensor Replacement

Model: 2002 Jeep Grand Cherokee Fault Code: P2177 Posted: 2020-12-06 12:33

Hello, My 2002 Jeep Grand Cherokee won't start recently — it cranks but shows no ignition. The fuel rail is pressurized, and a crankshaft position sensor (CPS) fault code appeared. I replaced the CPS, and the vehicle started immediately. However, it now exhibits misfires on all cylinders (P0300-P0306) along with coil bank faults (P0351-P0353). The car starts, idles briefly, then stalls repeatedly — unable to drive safely. I've already replaced the spark plugs, which appear in good condition. I also swapped out the ignition relay with a known-good unit, but the issue persists. No other error codes have appeared since the CPS replacement. Could this be related to an electrical fault in the coil bank circuits or a defective aftermarket sensor? Any insights on diagnosing P0351-P0353 and intermittent stalling? Thanks for any help!

Related fault codes
P2177
Comments (4)
Anonymous 2020-12-07 08:43

Check the coil bank circuits — common causes of P0351 include: short to voltage or ground in the COP driver circuit, open circuit in the COP driver, loose connection at the coil or broken connector locks, faulty coil (COP), or a malfunctioning Powertrain Control Module. For detailed troubleshooting, refer to official diagnostic resources for P0351.

Anonymous 2020-12-08 10:49

Consider using an original equipment manufacturer (OE) crankshaft position sensor. Aftermarket sensors have been known to cause ignition failure and misfire codes in 2002 Jeep Grand Cherokee models.

Anonymous 2020-12-08 11:02

An electrical fault in the crankshaft position sensor circuit is possible, though no CPS-related codes are currently present. A lab scope (oscilloscope) would be needed to verify signal integrity and rule out intermittent sensor issues.

Anonymous 2020-12-08 11:31

I've personally observed misfire symptoms caused by aftermarket crankshaft position sensors. However, I didn't see P0351-P0353 codes appearing before the CPS replacement — this suggests a possible new fault in the coil bank circuit or wiring after sensor replacement.