Technical Service Bulletin (TSB)
Flash: Powertrain Control Module (PCM) Updates
REFERENCE:

TSB: 18-034-25
GROUP: 18 - Vehicle Performance

Date:

June 25, 2025

REVISION: 18-018-19 REV. A

VEHICLES
AFFECTED:

2019 (WK) Jeep Grand Cherokee
MARKET APPLICABILITY:
This bulletin applies to vehicles equipped with the 5.7L V8 HEMI MDS
MEA
NA
VVT Engine (Sales Code EZH) **and an 8-Spd Auto 8HP70 Trans (Buy)
SA
IAP
(Sales Code DFD).**
EE

CH

NOTE: **This bulletin applies
to North and South
America, Middle East &
Africa, and India & Asia
Pacific markets.**
CUSTOMER
SYMPTOM:

**Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must
exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
● P0420 - Catalyst System Efficiency Below Threshold Bank 1.
● P0430 - Catalyst System Efficiency Below Threshold Bank 2.**
**In addition, the customer may experience one or more of the following:
● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.**
● Actual fuel economy reporting may not match the Instrument Panel Cluster (IPC).
Other software enhancements:
● Calibration update to address EVAP system emissions monitor readiness status accuracy.

CAUSE:

**PCM software**

This bulletin supersedes Technical Service Bulletin (TSB) 18-018-19 REV. A, date of issue October
5, 2019, which should be removed from your files. All revisions are highlighted with **asterisks**
and include an updated Customer Symptom statement, a new Market Applicability note, new DTCs,
new customer symptom, new Cause, updated LOP, updated Diagnosis statement, new Special Tools/
Equipment section, updated Repair Procedure step and a new Repair Procedure note.
Updates not highlighted by asterisks include the removal of a vehicle model and removal of a failure
code.
This Service Bulletin is also being released as Rapid Response Transmittal (RRT) 19-069, dated
October 05, 2019. All applicable Sold and UnSold RRT VINs have been loaded. To verify this RRT
service action is applicable to the vehicle, use VIP or perform a VIN search in DealerCONNECT/Service
Library. All repairs are reimbursable within the provisions of warranty.
REPAIR SUMMARY:
This bulletin involves reprogramming the PCM with the latest available software.

CLAIMS DATA:

Labor Operation No:
**18-19-06-HR

Failure Code

Labor Description
Module, Powertrain
Control (PCM) Reprogram
(0 - Introduction)
CC

Skill Category
1 - Engine Repair and
Performance

Labor Time
0.3 Hrs.**

Customer Concern

The dealer must use failure code CC with this Technical Service Bulletin.
● If the customer’s concern matches the SYMPTOM identified in the Technical Service Bulletin, failure code
CC is to be used.
● When utilizing this failure code, the 3C’s (customer’s concern, cause and correction) must be provided for
processing Technical Service Bulletin flash/reprogramming conditions.
DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/
Service Library, verify all related systems are functioning as designed. If DTCs or symptom conditions, other
than the ones listed above are present, record the issues on the repair order and repair as necessary before
proceeding further with this bulletin.
**If the customer describes any of the symptoms listed above in the customer symptom section, perform the
Repair Procedure.**
**SPECIAL TOOLS/EQUIPMENT:

Description
wiTECH or Equivalent

Ref. No.
–

Notes
–**

REPAIR PROCEDURE:
NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow
the charging voltage to climb above 13.5 volts during the flash process.
NOTE: If this flash process is interrupted/aborted, the flash should be restarted.
1. **Reprogram the PCM with the latest software. If issues arise when flashing a module using the wiTECH
Diagnostic Application, please submit a ticket to the Helpdesk. The helpdesk can be found within the Help
menu.
2. Clear all DTCs that may have been set in any module due to reprogramming. The wiTECH application will
automatically present all DTCs after the flash and allow them to be cleared.**
NOTE: **After applying this TSB, it is not necessary to send DID-I or DID-A.**
POLICY:
Reimbursable within the provisions of the warranty.
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.