P0601 on Jeep: How to Diagnose & Fix
Internal Control Module Memory Check Sum Error
1 Jeep model · 1 documented issue · $300-$1,000 repair
P0601 on Jeep by model: symptoms, diagnosis and fix
The WJ PCM (engine computer) can develop internal faults — often heat/temperature-related micro-cracks or solder failures — that cause intermittent stalling, hard-to-diagnose no-starts and driveability problems that come and go with ambient temperature. A well-known WJ case: a 2000 4.7L stalled only when outside air exceeded ~60F; a rebuilt/replaced PCM cured it after many other parts were replaced in vain.
Common Symptoms
- Intermittent stalling, often correlated with heat/warm weather
- Crank but no-start that comes and goes
- Multiple unrelated sensor codes
- Driveability that improves when cold
- Repairs of individual sensors don't resolve it
How to Fix
Diagnose by elimination after CKP, fuel pump, and grounds are ruled out. Options: send the PCM for bench repair (specialists like Circuit Board Medics), or install a remanufactured PCM programmed to the vehicle's VIN and SKIM/immobilizer. Any replacement PCM must be VIN-programmed to run. Inspect PCM connectors/pins for corrosion first.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- UpFix repair-and-return service for the original WJ PCMOEMUpFix 46855
Bench repair of the vehicle's original PCM only after vehicle-side diagnosis confirms an internal module fault covered by the service Fitment/availability: SKU 46855 describes a repair-and-return service for 1996-2004 Grand Cherokee 4.0L…
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Sources for this issue (2)
P0601 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0601 mean on a Jeep?
P0601 stands for "Internal Control Module Memory Check Sum Error." The control module ran an internal self-check (checksum) on its memory and the calculated value did not match the stored value, indicating corrupted or failed internal memory. It is an internal module integrity fault. On Jeep it is documented across 1 model: Grand Cherokee.
What are the most common causes of P0601?
The most common causes of P0601 are: Corrupted or failed internal PCM/ECM memory, Faulty/aborted software reflash or programming, Low or unstable battery/system voltage during operation, Corroded PCM ground or power connectors, Defective control module. The specific cause varies by vehicle.
How much does it cost to fix P0601 on a Jeep?
Published repair estimates on Jeep range from $300 to $1,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0601 on a different make?
View P0601 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.