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2000 Grand Cherokee P0320 and P0720: Causes, Diagnosis, and Fix for Hard Starting and Engine Stalling

Model: 2000 Grand Cherokee Fault Code: P0320 Posted: 2009-03-18 17:05

My 2000 Grand Cherokee with a 4.7L V8 and automatic transmission has recently started exhibiting intermittent stalling when coming to a stop. The vehicle would restart easily after stalling. However, the issue has now progressed: once warmed up and operating at normal temperature, it struggles to start after being turned off. It died completely during a drive, and I had to wait about 45 minutes for it to cool down before it restarted. I scanned the vehicle and found two diagnostic trouble codes: P0320 and P0725. Are these related? Or are they independent issues? P0320 indicates an engine speed input circuit malfunction or a missing crankshaft reference signal to the Powertrain Control Module (PCM). P0725 refers to a transmission engine speed sensor fault. Given that both codes appear together, is it likely that the root cause lies in one of the vehicle's speed sensors—specifically the crankshaft or camshaft position sensor? Where should I begin troubleshooting and what parts should I inspect first?

Related fault codes
P0320P0725
Comments (2)
Anonymous 2009-03-20 09:22

The P0725 code relates to the transmission's engine speed signal. If the engine's RPM signal from the crankshaft position sensor is lost, it’s logical that both P0320 and P0725 would be triggered. This strongly suggests a failing crankshaft or camshaft position sensor. On my 2000 Grand Cherokee, I recommend replacing both sensors with OEM parts directly from the dealer. Aftermarket sensors have been known to fail prematurely in Jeep models—especially under high-temperature conditions. The P0320 code is common on Dodge and Jeep vehicles, so this issue may be consistent across similar models.

Anonymous 2009-03-22 04:04

Thanks for the detailed explanation! I’ll replace both sensors with dealer-grade OEM parts and update you once I’ve tested the results. I’ve seen many posts about P0320 on Dodge vehicles, and it’s reassuring to confirm that this is likely a shared issue across similar models.