JHilltop

Here are some replacement ECM/PCM (engine computer) notes:
- 2001 Jeep Grand Cherokee WJ 4.0L 4WD
- Mileage when repaired=172.8 (7.2K miles ago)
- Repair date=04/13/17 (18 months ago)

Symptoms:
- On the road:
- Lost all gauges while driving (~5 miles and at 40 mph). All gauges swiped across once like at key on, then no gauges.
- Turned it off, it did restart, drove it home.

Diagnostics:
- Step #1: attach the code reader
- Result: could not connect to computer
- Step #2: disconnected the battery to reset computer
- Results: dash displayed lost sentry key communication. Car would start & run for 3 seconds & auto shutdown.

Cause:
- ECM/PCM (engine computer) failure

Repairs:
1) ECM/PCM (engine computer):
- Replaced OEM part#: Mopar P56041784AC; Motorola SN:09A1000R3774; Module:TEM2650R3774
- Replacement part#: remanufactured 56041784
- All Computer Resources, https://store.allcomputerresources.com/
- Re cost:
- On 12/17/18: the price is $239 via their website and on Ebay
- On 04/13/17: the price was $148+$7 shipping via Ebay on 04/13/17.
- Lifetime warranty
- Re ordering & handling: (refer to their website)
- Purchase and receive a replacement remanufactured ECM/PCM from them
- Ship your old ECM/PCM back to them in their box


2001 JGC 4.0L 4WD, replaced ECM/PCM, OEM Part#: P56041784AC... this picture displays the ECM/PCM front side

2001 JGC 4.0L 4WD, replaced ECM/PCM, OEM Part#: P56041784AC... this picture displays the ECM/PCM back side

2001 JGC 4.0L 4WD, replaced ECM/PCM, OEM Part#: P56041784AC... this picture displays the ECM/PCM mount location on the passenger side firewall behind the coolant overflow/reserve tank