Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the...
Jeep technical service bulletin 18-022-20 for 2019 Jeep Wrangler.
- Bulletin number
- 18-022-20
- Component
- Power train
- Summary
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. The customer may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs:P06EF - Engine Restart Performance. P050B - Cold Start Ignition Timing Performance. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification Test (SLVT) to determine if a leak is present in the system. P0128 - Thermostat Rationality. P0507 - Idle Speed Performance Higher Than Expected. Customers may also describe the following condition:Excessive radiator fan noise when the A/C is on MAX output. In addition, the following software enhancements are available:Electric Vacuum Pump (EVP) update. Fan noise reduction.
Owners of these vehicles have filed 81 complaints in the transmission category.
Vehicles covered
- Jeep Wrangler 2019 2019
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