1999 Plymouth Prowler 3.5L PCM ECM Replacement Guide
The Powertrain Control Module (PCM) in the 1999 Plymouth Prowler manages engine and transmission functions. Failure can cause drivability problems, no-start conditions, and stored trouble codes such as P0600 series internal faults.
Quick Summary
- PCM removal and replacement has a book time of 0.5 hours.
- A PCM relearn procedure also takes 0.5 hours after installation.
- Factory programming requires a DRB scan tool to enter the VIN and original mileage.
- Chrysler TSB #18-037-05 covers flash programming failure recovery using the DRBIII.
- Documented internal trouble codes include P0600, P0601, P0622, P0645, P1682, P1683, P1687, P1695, P1696, P1697, and P1698.
If you own a 1999 Plymouth Prowler with the 3.5L engine and are experiencing drivability issues, the Powertrain Control Module (PCM) may be at fault. This guide explains what the PCM does in your Prowler, where it is located, and what the factory replacement procedure involves. You will learn the common symptoms of a failing PCM, the required programming steps, and how a pre-programmed replacement can simplify the job. The information here is based on factory labor times, service bulletins, and documented trouble codes specific to this vehicle.
What the PCM Does in a 1999 Plymouth Prowler
The Powertrain Control Module (PCM) in the 1999 Plymouth Prowler is the central computer that controls the 3.5L engine and the automatic transmission. It receives sensor inputs for throttle position, crankshaft speed, oxygen levels, and more, then adjusts fuel delivery, ignition timing, and shift points. When the PCM fails, the vehicle may not start, run poorly, or store diagnostic trouble codes. For owners seeking replacement PCMs for the Prowler, understanding the module’s role is essential for correct diagnosis and repair.
Where the PCM Is Located and What Replacement Involves
The provided labor facts list a book time of 0.5 hours for both the Engine Control Module and the Powertrain Control Module removal and replacement. No specific physical location is given in the available data. Replacement involves disconnecting the battery, unbolting the module, and disconnecting its wiring harness. After installation, a PCM relearn procedure is required, also book time 0.5 hours. Ensure the ignition is off and the battery is disconnected before handling the module to avoid electrical damage.
How to Reach the PCM on the 1999 Plymouth Prowler
- Remove body side panel.
- Remove 3 bolts from PCM bracket.
- Disconnect PCM 2 40-way connectors powertraincontrolair.
Work with the ignition off, and treat the module as static-sensitive: avoid touching the connector pins at any point.
| Operation | Configuration | Book Time |
|---|---|---|
| Engine Control Module Relearn | All configurations | 0.5 hr |
| Engine Control Module R&R | All configurations | 0.5 hr |
| Powertrain Control Module R&R | All configurations | 0.5 hr |
| Powertrain Control Module Relearn | All configurations | 0.5 hr |
Programming Requirements After Replacement
After installing a new PCM, the factory procedure requires using a DRB scan tool to reprogram the module with the vehicle’s original VIN and mileage. This step is critical for proper communication with the immobilizer and other systems. Flagship One supplies a VIN-programmed replacement PCM that arrives with the correct VIN and mileage already loaded, so the DRB reprogramming step is eliminated. You only need to perform the relearn procedure after installation.
Symptoms of a Failing PCM
A failing PCM in the 1999 Plymouth Prowler can cause a no-start condition, intermittent stalling, rough idle, or poor acceleration. You may also notice the check engine light illuminated with codes such as internal control module fault. Transmission shifting may become erratic or harsh. The scan tool may fail to communicate with the module. Other symptoms include misfire codes, fuel trim issues, and the vehicle entering a limp-home mode. Addressing these symptoms promptly can prevent further drivability problems.
Module Trouble Codes on the 1999 Plymouth Prowler
The following trouble codes are stored internally within the PCM and indicate specific failures. They are documented for the 1999 Plymouth Prowler and can help diagnose module-related issues.
| Code | Meaning | Full Guide |
|---|---|---|
| P0600 | Module-internal fault | Full P0600 guide → |
| P0601 | Internal memory checksum error | Full P0601 guide → |
| P0622 | Module-internal fault | Full P0622 guide → |
| P0645 | Module-internal fault | Full P0645 guide → |
| P1682 | Module-internal fault | Full P1682 guide → |
| P1683 | Control module fault | Full P1683 guide → |
| P1687 | Module-internal fault | — |
| P1695 | Module-internal fault | — |
| P1696 | Module-internal fault | — |
| P1697 | Module-internal fault | — |
| P1698 | Module-internal fault | — |
Factory Service Bulletins Worth Knowing
Chrysler issued Technical Service Bulletin #18-037-05, titled ‘Flash Programming Failure Recovery Using DRBIII®’. This bulletin provides a recovery procedure if a PCM programming attempt fails during a flash update. It applies to the 1999 Plymouth Prowler and other Chrysler vehicles of the era. The bulletin outlines steps to restore communication and complete the programming using the DRBIII scan tool.
| Bulletin | Subject | What It Addresses |
|---|---|---|
| 18-037-05 | 18-037-05 Flash Programming Failure Recovery Using DRBIII® | — |
Protecting the PCM in Your 1999 Plymouth Prowler
- Maintain the charging system; a failing alternator can send voltage spikes that damage the PCM.
- Keep battery and chassis grounds clean and tight to ensure stable voltage reference.
- Avoid jump-starting with a running donor vehicle; connect cables only with both engines off.
- Address diagnostic trouble codes promptly, especially P0600-series internal faults.
- Inspect PCM connector seals for corrosion or moisture intrusion and replace if damaged.
Frequently Asked Questions
Can I replace the PCM in my 1999 Plymouth Prowler myself?
Yes, if you have basic mechanical skills. The book time for removal and replacement is 0.5 hours. You will need to disconnect the battery, unbolt the module, and unplug the harness. After installation, a relearn procedure is required.
What does the DRB scan tool do for the 1999 Plymouth Prowler PCM?
The DRB scan tool is used by the factory to program the new PCM with the vehicle’s VIN and original mileage. This step is necessary for the module to communicate with the vehicle’s security and other systems.
Will a used PCM from another 1999 Prowler work in my car?
A used PCM may work, but it must be reprogrammed with your vehicle’s VIN and mileage using a DRB scan tool. Without that, the module may not start the engine or may cause security issues.
When your 1999 Plymouth Prowler’s PCM fails, you have options: repair the original module or replace it with a refurbished unit. Replacement is often more reliable, especially if the module has internal faults. Flagship One offers pre-programmed PCMs that arrive ready to install, saving you the DRB programming step. This model-specific solution ensures compatibility with your 3.5L engine and transmission.
Flagship One stocks a refurbished, VIN-programmed PCM for the 1999 Plymouth Prowler with a lifetime warranty, free shipping and no core charge. The full Plymouth Prowler module lineup covers other engine configurations as well.
Final Thoughts
The 1999 Plymouth Prowler 3.5L relies on its PCM for engine and transmission control. Recognizing symptoms like no-start or shifting issues and understanding the replacement procedure can help you get back on the road. A pre-programmed replacement from Flagship One simplifies the job by eliminating the factory DRB programming step.