P0601 on 2022 Ram PROMASTER: Causes for Internal Memory Checksum Error

What's Unique About the 2022-2022 Ram PROMASTER

For the 2022 Ram ProMaster, this code has a specific, documented history. Manufacturer Technical Service Bulletins (TSBs) show that P0601 often appears with other codes, like P0325 (Knock Sensor) and B1040-64. This indicates a known issue with the PCM for this model year, where the internal failure can cause the module to misinterpret data from other vehicle systems. The TSB repair procedure involves reprogramming the PCM with updated software, though in many cases the hardware has failed and requires replacement. The TSB specifically applies to vehicles equipped with the 3.6L V6 engine and adaptive cruise control.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on
• Engine may crank but will not start
• Intermittent or sudden engine stalling
• Reduced engine power or vehicle entering "limp mode"
• Difficulty starting the engine
• Adaptive cruise control may be inoperative
• Remote start may be inoperative

Most Likely Causes

1. Powertrain Control Module (PCM) Internal Failure 🔴 High Probability Manufacturer TSBs (#1802522REVC, #1802522REVB, #1802522REVA) for the 2022 ProMaster specifically link P0601 to other codes, pointing to a known PCM issue for this model year. This code is historically common on Chrysler/Dodge products due to internal hardware failure from age, heat, or vibration.
   How to confirm: After ruling out power/ground issues, the diagnosis is confirmed by exclusion. If all external inputs to the PCM are good, the module itself is condemned. A professional-grade scan tool is needed for this process. Sometimes, a burnt smell near the computer can indicate internal component failure.
   Typical fix: Replace the Powertrain Control Module (PCM) and program the new unit to the vehicle. In some cases outlined by the TSB, a software reflash by the dealer may resolve the issue if the hardware is not yet damaged.
   Est. part cost: $271-$750
2. Low Battery Voltage or Power Supply Issue ⚪ Low Probability While not specific to the ProMaster, any vehicle can experience electronic module issues from unstable voltage. A failing alternator can produce voltage spikes that damage the PCM.
   How to confirm: Test the battery with a load tester to ensure it's healthy. Check the battery terminals and main PCM power/ground cables for corrosion or looseness. With the engine running, verify the alternator is charging correctly (typically 13.5-14.5 volts). A technician should perform a voltage drop test on the PCM's power and ground circuits.
   Typical fix: Recharge or replace the battery. Clean or tighten battery terminals and cable connections. Replace a faulty alternator.
   Est. part cost: $150-$300

Rare But Worth Checking

• Failed PCM Software Update: An interrupted or improperly performed software flash can corrupt the PCM's memory, triggering a P0601 code. The TSB repair procedure itself involves a reflash, and it warns that the process should not be interrupted.
• Federal Emissions Warranty Coverage: Before paying for a repair, owners should check their warranty status. The PCM is a critical emissions component, and in the United States, it is often covered under a federal emissions warranty for 8 years or 80,000 miles, which could make the repair free at a dealership.

Diagnosis Steps

1. Scan the vehicle for all diagnostic trouble codes. Note if P0325 and/or B1040-64 are present alongside P0601, which strongly indicates the TSB applies.
2. Check the vehicle's battery. Ensure it is fully charged and passes a load test. Clean any corrosion from the terminals.
3. Inspect the battery terminals and the main power and ground connections to the PCM for tightness and corrosion.
4. Verify the charging system is functioning correctly and providing stable voltage (typically 13.5-14.5V while running).
5. If all power and ground circuits are confirmed to be good, the fault is internal to the PCM.
6. Consult TSB #1802522REVC to confirm the issue matches the pattern described by the manufacturer. The TSB repair procedure is to reprogram the PCM with the latest software.
7. If reprogramming fails or the code returns, proceed with PCM replacement and programming by a qualified technician.

Parts You'll Likely Need

• Powertrain Control Module (PCM) (OEM #68540972AJ (supersedes 68540972AI)) — This code indicates a fatal internal error within the PCM itself. Replacement is the only definitive repair if a reflash doesn't work.
  Trusted brands: Mopar
  OEM price range: $125-$250
  Aftermarket price range: $271-$550

Related Codes That Often Appear With This One

• P0325 — As per TSB #1802522REVC, the internal PCM failure causes it to incorrectly flag a fault with the knock sensor circuit.
• B1040-64 — Also cited in TSB #1802522REVC, this body control code appears because the failing PCM creates signal plausibility failures within the vehicle's communication network.

Technical Service Bulletins (TSBs) & Recalls

• 1802522REVC: Addresses MIL illumination with DTCs P0601, P0325, and B1040-64 set in memory. The fix is to reprogram the PCM.
• 1802522REVB: Earlier revision of the same bulletin for P0601 and associated codes.
• 1802522REVA: Initial version of the TSB for P0601 and B1040-64.

Platform-Specific Known Issues

• A series of Technical Service Bulletins (TSBs #1802522REVA, #1802522REVB, #1802522REVC) were issued for the 2022 Ram ProMaster, indicating a known problem where an internal PCM fault (P0601) would also cause codes P0325 (Knock Sensor) and B1040-64 (Signal Plausibility Failure) to be set. This confirms a specific weakness in the PCMs for this model year. The TSB applies to vehicles with the 3.6L engine and adaptive cruise control, and the prescribed fix is a PCM software update.

Mechanic-Grade Diagnostic Values

• Battery Voltage (Key Off) — expected: 12.6 Volts or higher. Failure: Voltage below 12.4V indicates a weak or discharged battery that can cause false codes.
• Charging System Voltage (Engine Running) — expected: 13.5 - 14.5 Volts. Failure: Voltage outside this range indicates a faulty alternator or voltage regulator, which can damage the PCM.
• PCM Ground Strap Integrity — expected: < 0.1 Ω. Failure: Higher resistance indicates a poor ground, which can cause data corruption and trigger a P0601.
• PCM Power Feed Voltage Drop — expected: < 0.5 V under load. Failure: A voltage drop greater than 0.5V indicates excessive resistance in the power supply circuit to the PCM.

Scan Tool Commands That Help

• wiTECH: OBD2 Monitors - Misfire Monitor — To view live misfire data, which on Chrysler vehicles is often located under the generic OBD-II monitors section rather than a manufacturer-specific system test.
• wiTECH: Loss of Communication Test — To perform a real-time 'ping' test of all modules on the network. This can help verify if the PCM is responsive or has dropped off the communication bus.
• wiTECH: Reprogram PCM — This is the specific repair procedure called for 🎬 Watch: How to program a new PCM using wiTech. by TSB 18-025-22 REV C to fix the software glitch that can cause P0601.
• wiTECH: Restore Vehicle Configuration — After installing a new PCM, this function is used to program the vehicle's VIN and other configuration data into the new module.

Wiring & Ground Locations

• Primary Engine Ground Strap — A braided strap that connects from the transmission case to a bolt on the top of the transmission mount, accessible by removing the driver's side headlight.. This is the primary ground for the engine and transmission. A poor connection here can cause inconsistent voltage and data corruption for the PCM, potentially leading to a P0601 code.
• Upfitter Connector Ground Point — For upfitted vans, a dedicated ground post may be installed behind a panel at the base of the passenger-side B-pillar. Factory paint must be ground away for a good connection.. Improperly grounded aftermarket equipment can back-feed electrical noise or create ground loops, destabilizing the vehicle's electrical system and potentially affecting the PCM.

OEM Part Supersession History

• 68540972AI → 68540972AJ — The reason for the supersession is not officially documented, but it is common for part numbers to be updated to reflect hardware revisions or software updates aimed at improving reliability, potentially addressing the very issue causing the P0601 TSB.
  Heads up: The parts are interchangeable, but the newest version (AJ) should always be used for repairs.