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Jeep Grand Cherokee ECM, PCM & ECU Replacement
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Grand Cherokee ECM Fitment by Generation: WJ, WK, and WK2
Car Computer Exchange stocks Jeep Grand Cherokee ECMs, PCMs, and ECUs for every model year from 1996 through 2020, each one matched to a specific engine. On a Grand Cherokee the engine computer is technically a Powertrain Control Module, so ECM, PCM, and ECU all name the same part. The grid above is split year by year because the right module depends on your model year and engine.
Coverage runs across four generations:
- First-generation (1996 to 1998): the 4.0L inline-six and available V8.
- WJ (1999 to 2004): 4.0L inline-six, 4.7L V8, and 4.7L High Output V8. Separate transmission control modules are stocked for 1999 through 2003.
- WK (2005 to 2010): 3.7L V6, 4.7L V8, 5.7L HEMI V8, and 6.1L SRT V8.
- WK2 (2011 to 2020): 3.6L Pentastar V6, 5.7L HEMI V8, 6.4L SRT HEMI, 3.0L EcoDiesel, and the supercharged 6.2L on 2018 to 2020 models.
Each year is listed on its own so you order the module built for your truck, like the 2004 Grand Cherokee PCM or the 2014 3.6L PCM. For other models, browse the full Jeep PCM and ECM catalog.
Every Grand Cherokee PCM Ships Pre-Programmed to Your VIN
Every Grand Cherokee module from Car Computer Exchange ships flashed to your VIN with the latest factory software, so it installs without a trip to the dealer. A factory-blank PCM has to be programmed with a dealer-level scan tool to match your vehicle and its anti-theft system, which adds a separate fee. The pre-flashed module skips that step.
Anti-theft data is synced before the module leaves the shop. Grand Cherokees from 1998 through 2007 use the Sentry Key Immobilizer Module (SKIM), and 2008-and-newer models use the Wireless Ignition Node (WIN). Both are matched to your VIN so your existing keys keep working. Car Computer Exchange programs and tests every module in Raleigh, North Carolina.
Most installs need only a short idle relearn: turn the key on, let the module sit for about 10 minutes, then drive a normal cycle. The 3.6L Pentastar and 5.7L HEMI calibrations are VIN-keyed and carry across the platform, so Chrysler PCMs follow the same process. You send your old core, the failed module, back after the swap.
Symptoms of a Failing Grand Cherokee ECM and the Codes It Sets
A failing Grand Cherokee PCM usually shows up as a no-start, a stall while driving, repeated misfires, or a scan tool that cannot communicate with the module. Because the PCM runs fuel, spark, and emissions at once, the symptoms often look like several separate problems.
Watch for these signs:
- Engine cranks but will not start, or starts and then stalls.
- Check-engine light that returns after sensors and coils are replaced.
- Scan tool reports no communication with the PCM.
- Rough idle, misfires, or charging faults.
Common trouble codes that point at the module are P0600 (serial communication link), P0601 (internal memory checksum error), P0606 (PCM processor fault), and P0700 (transmission control). Internal faults like P0601 and P0606 trace back to capacitor wear and solder fatigue inside the case. WJ 4.7L models are known for intermittent stalling that turns out to be a bad PCM, and 2011 to 2013 WK2 models show internal-circuit failures that the 2011 5.7L PCM directly replaces.
If a no-start comes with phantom electrical behavior, such as wipers running on their own or the fuel pump cycling with the key off, the cause is usually the TIPM, a separate module. The Jeep TIPM repair service handles that.
Every Grand Cherokee Module Passes a 13-Point Simulator Test
Every Grand Cherokee module runs through a 13-point quality check on a computer-aided vehicle simulator before it ships. The simulator emulates the engine, transmission, emissions, and anti-theft systems, and every circuit is tested under load. This is not a bench power-on check.
Each module carries a free lifetime warranty. Ship the old core back in the prepaid box to activate it, and the warranty covers up to two replacement units with no mileage limit. The 60-day Iron-Clad Guarantee adds a money-back guarantee: if the module does not solve the issue within 60 days, return it for a refund or exchange. Car Computer Exchange has served more than 150,000 customers since 2011 and carries hundreds of verified customer reviews.
FAQs
What is an ECM on a Jeep Grand Cherokee, and is it the same as a PCM or ECU?
The ECM, or engine control module, is the computer that manages fuel, spark, and emissions. On a Jeep Grand Cherokee it is technically a Powertrain Control Module (PCM) because the same unit also coordinates the transmission, which is why early WJ models from 1999 to 2003 ran a separate TCM alongside it. ECM, PCM, and ECU all name the same Grand Cherokee part. VIN matching matters because the PCM is paired to the Sentry Key immobilizer, so a blank module has to be flashed to your specific vehicle.
How much does a Jeep Grand Cherokee ECM or PCM replacement cost?
A remanufactured, VIN-programmed Grand Cherokee module from Car Computer Exchange costs a few hundred dollars, and the exact price depends on your model year and engine. A dealer charges more once you add the part, the programming fee, and labor. Because the module ships pre-flashed to your VIN, there is no separate programming charge. Enter your year, make, and model to see the price for your exact vehicle.
How do I reset the ECM on my Jeep Grand Cherokee?
Disconnecting the negative battery cable for about 15 minutes clears the PCM's stored trouble codes and resets its learned fuel trims. The module relearns idle and fuel settings over the next few drive cycles. A reset clears false codes, but it does not repair a physically failed module. If the same codes return after the reset, the PCM itself is the problem and needs replacing.
Where is the PCM located on a Jeep Grand Cherokee?
On most Grand Cherokees the PCM sits in the engine bay inside a metal case with one or more wiring connectors. WJ and WK models mount it against the firewall, and WK2 models place it near the battery and air intake. Once the connectors are released, it is a bolt-on swap that does not require cutting or splicing.
What is the difference between a Grand Cherokee module replacement and the repair service?
A replacement module ships ready to install, pre-programmed to your VIN, and you send your old core back afterward. The repair service is a send-in model: you ship Car Computer Exchange your existing module, the failed circuits are rebuilt and reflashed, and your original unit comes back to you. The grid lists repair-service options for higher-output engines such as the 6.1L and 6.4L SRT.
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The most common questions related to exchanging your car computer for one that works.
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