Last updated on July 19th, 2026 at 11:34 am
In the 2019 Chevrolet Impala, the powertrain control module (PCM) and engine control module (ECM) manage fuel delivery, ignition timing, and emission functions. Failure of either unit may cause loss of power, erratic idle, or communication errors that trigger multiple P060x codes.
When a 2019 Chevrolet Impala exhibits symptoms like no‑start, stalling, or a cascade of powertrain codes, the PCM or ECM may be at fault. This guide explains what these computer modules do, where they sit, how they are replaced, and what post‑install programming is required. By following the outlined steps you can understand the process, anticipate labor time, and know how a Flagship One replacement fits into the repair.
The PCM in the 2019 Chevrolet Impala oversees transmission shifting, fuel injection, and emission controls, while the ECM focuses on engine‑specific functions such as spark timing and sensor integration. Together they ensure the vehicle runs smoothly and meets regulatory standards. Understanding their role helps you see why a malfunction can trigger a range of power‑train codes. The vehicle uses replacement engine computers for the Impala that must match the original specifications to maintain performance.
Both the PCM and ECM are mounted within the engine compartment, accessible after removing the cover and disconnecting the battery. Removal involves disconnecting the ECM connectors, which must be done with the ignition off to avoid damage, then unbolting the unit. Installation reverses the steps, using the book times of 0.8 hours for each R&R and an additional 0.5 hours for relearn procedures. No torque specifications were provided, so follow standard fastener practices.
Work with the ignition off, and treat the module as static-sensitive: avoid touching the connector pins at any point.
| Operation | Configuration | Book Time |
|---|---|---|
| Powertrain Control Module R&R | All configurations | 0.8 hr |
| Powertrain Control Module Relearn | All configurations | 0.5 hr |
| Engine Control Module R&R | All configurations | 0.8 hr |
| Engine Control Module Relearn | All configurations | 0.5 hr |
| Engine Control Module Reset | All configurations | 0.3 hr |
After a new module is installed, the factory calls for a PCM relearn of 0.5 hours and an ECM relearn of the same duration, followed by a brief ECM reset of 0.3 hours. Because Flagship One supplies a VIN-programmed replacement unit, those programming steps are already completed, allowing you to skip the relearn and reset tasks.
Typical indications of a failing PCM or ECM in the 2019 Chevrolet Impala include engine cranking without start, sudden stalling, rough idle, and loss of driveability. Diagnostic scans often reveal multiple P060x codes; for example, processor communication fault can appear when the PCM cannot communicate with the ECM. You may also notice dead scan‑tool connections or erratic transmission shifts.
The following trouble codes are commonly stored by the PCM and ECM in the 2019 Chevrolet Impala:
| Code | Meaning | Full Guide |
|---|---|---|
| P0601 | Internal memory checksum error | Full P0601 guide → |
| P0602 | Control module programming error | Full P0602 guide → |
| P0603 | Keep-alive memory (KAM) error | Full P0603 guide → |
| P0604 | Internal RAM error | Full P0604 guide → |
| P0605 | Internal ROM error | Full P0605 guide → |
| P0606 | Module processor failure | Full P0606 guide → |
| P0607 | Module performance fault | Full P0607 guide → |
| P060A | Module-internal fault | — |
| P060B | Module-internal fault | — |
| P060C | Module-internal fault | — |
| P0610 | Module-internal fault | Full P0610 guide → |
| P062F | Internal EEPROM error | Full P062F guide → |
Service Bulletin PIP5373B (June 11 2018) addresses ECM error codes E4491 and E4423. Bulletin PIP5597 (October 8 2018) notes that technicians might be asked to input the engine identification number during ECM programming.
| Bulletin | Subject | What It Addresses |
|---|---|---|
| — | Preliminary Information > Engine/Propulsion > #PIP5373B: Program ECM Error E4491/E4423 – (Jun 1 | — |
| — | Preliminary Information > Engine/Propulsion > #PIP5597: Engine identification Number Requested | During the programming of some ECM’s, the technician may be prompted to input the engine identification |
The book time for removing and reinstalling the powertrain control module is listed as 0.8 hours, plus an additional 0.5 hours for the required relearn procedure.
Factory guidance calls for a 0.3‑hour reset, but a Flagship One VIN‑programmed replacement already includes that step, so a separate reset is typically unnecessary.
Yes, because the PCM controls shift timing, a malfunctioning ECM can send incorrect data, leading to rough or delayed shifting.
When the PCM or ECM fails in a 2019 Chevrolet Impala, you can choose a professional repair with a new factory‑sourced unit or opt for a refurbished Flagship One replacement. Both approaches restore engine control, but the Flagship One part arrives pre‑programmed, potentially reducing shop time.
Flagship One stocks a refurbished, VIN-programmed PCM for the 2019 Chevrolet Impala with a lifetime warranty, free shipping and no core charge. The full Chevrolet Impala module lineup covers other engine configurations as well.
Replacing the PCM or ECM in your 2019 Chevrolet Impala can return reliable performance and clear persistent codes. Consider a VIN‑programmed Flagship One unit for a streamlined install and get your vehicle back on the road.