P0603 on 2011-2021 Dodge Durango 5.7L: Keep Alive Memory Error Causes and Fixes

What's Unique About the 2011-2021 Dodge Durango

On Dodge, Chrysler, and Jeep vehicles from this era, the Totally Integrated Power Module (TIPM) is a known source of complex electrical issues. For 2011-2013 models, the TIPM was subject to recalls (like FCA #R09, V62) for a faulty internal fuel pump relay that could cause stalling and no-start conditions, indirectly leading to battery drain and a P0603 code. While a simple battery or connection fault is the most likely cause for P0603, a failing TIPM can cause intermittent power loss to various modules, including the PCM. If you've exhaustively checked the battery 🎬 Watch: How to test and bypass a faulty TIPM relay. and connections, the TIPM is a platform-specific component to consider.

Symptoms You May Notice

• Check Engine Light is on
• Difficulty starting the engine, especially after sitting
• Rough or unstable idle
• Hesitation or sluggish acceleration
• Noticeable decrease in fuel economy
• Harsh or erratic transmission shifting
• In some rare cases, the engine may stall intermittently
• Other warning lights, like for the ABS or traction control, may illuminate

Most Likely Causes

1. Weak or Failing Battery 🔴 High Probability → Shop Vehicle Battery The 5.7L Hemi and the Durango's extensive electronics require a strong, stable battery. The battery is located under the front passenger seat, making it less obvious to inspect. 🎬 Watch: How to find and access the hidden battery compartment. A battery that is old or weak may drop below the required voltage to maintain KAM during engine cranking, triggering the code.
   How to confirm: Test the battery voltage with a multimeter. It should be ~12.6V with the engine off and 13.7V-14.7V with the engine running. Most auto parts stores offer free battery testing. Note that some 2017-2021 models with start-stop technology have a main and an auxiliary battery; either could be a fault point. 🎬 See this walkthrough for replacing batteries on start-stop models.
   Typical fix: Replace the vehicle's 12V battery. The common size is a Group 94R/H7 or H8.
   Est. part cost: $180-$400
2. Loose or Corroded Battery Terminals/Cables 🔴 High Probability → Shop Vehicle Battery Because the battery is located inside the cabin under the passenger seat, owners may neglect to check it. Over time, terminal connections can loosen or develop unseen corrosion, interrupting the constant power needed for the PCM's Keep Alive Memory.
   How to confirm: Access the battery under the passenger seat. Visually inspect the terminals, cable ends, and main chassis ground points for corrosion or for looseness. A loose negative terminal is a commonly reported cause.
   Typical fix: Disconnect the battery (negative first), clean the terminals and cable ends with a wire brush and a baking soda/water solution, and reconnect securely (positive first). Ensure the terminal clamps are tight and cannot be wiggled by hand.
   Est. part cost: $0-$10 (for cleaning supplies)
3. Faulty Charging System (Alternator) 🟡 Medium Probability An alternator that provides inconsistent voltage can cause electrical issues and fail to keep the battery properly charged, leading to low voltage conditions that trigger P0603.
   How to confirm: With the engine running, check the battery voltage. If it's below 13.5V or fluctuating wildly, the alternator is suspect. Free alternator testing is available at most auto parts stores.
   Typical fix: Replace the alternator.
   Est. part cost: $200-$500
4. Poor PCM Power or Ground Connection ⚪ Low Probability Body and engine grounds can corrode or loosen over time, creating a poor path for electricity and causing intermittent power interruptions to the PCM. These connections are exposed to the elements.
   How to confirm: Locate the main engine-to-chassis ground straps and PCM ground points. On the 5.7L Hemi, a key ground strap runs from the engine block to the frame rail. Check that they are clean, tight, and free of corrosion. A voltage drop test can definitively confirm a bad ground.
   Typical fix: Clean the contact points of the ground strap/wire with a wire brush and re-secure it. In some cases, the strap itself may need to be replaced. An example OEM part number is 68070029AA.
   Est. part cost: $15-$50

Rare But Worth Checking

• Faulty Totally Integrated Power Module (TIPM): → Shop Fuse Box The TIPM is a known failure point on 2011-2013 Durangos and was subject to safety recalls (e.g., 14V530, 15V115, V62). It can cause a wide range of bizarre electrical issues, including this code. It's worth considering if all battery/charging/connection issues have been ruled out.
• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This is the least likely cause. The PCM is a robust component. It should only be considered for replacement after all other possibilities have been professionally and thoroughly exhausted.
• Aftermarket Performance Tuner: If an aftermarket performance tuner has been used to flash the PCM, it can sometimes cause a P0603 code. The code may appear after returning the vehicle to the stock tune. This is a known occurrence on many vehicles, including those from Dodge/Chrysler.

Diagnosis Steps

1. Check for and document any other stored trouble codes.
2. Visually inspect the battery, terminals, and cable ends for any signs of corrosion, damage, or loose connections. The battery is located under the front passenger seat.
3. Using a multimeter, test the battery voltage. It should be approximately 12.6 volts with the engine off.
4. Start the engine and measure the battery voltage again. It should be between 13.7 and 14.7 volts, indicating a healthy charging system.
5. If voltage is low, fully charge the battery and re-test. If it doesn't hold a charge, replace the battery.
6. If the battery is good but charging voltage is low, have the alternator tested.
7. If all voltage tests pass, disconnect the battery terminals (negative first) and thoroughly clean them and the battery posts with a wire brush. Ensure they are re-tightened securely.
8. Locate and inspect the main engine-to-chassis ground straps. On the 5.7L, check the strap from the engine block to the frame. Ensure it is clean, tight, and free of corrosion.
9. Clear the P0603 code with a scan tool and drive the vehicle through several key cycles (turning the car on and off) to see if the code returns. If it does not, the issue was likely a temporary low voltage event.
10. If the code returns quickly, consider more advanced diagnostics like a voltage drop test on the PCM power and ground circuits or investigating the TIPM for faults, especially on 2011-2013 models.

Parts You'll Likely Need

• 12V Battery (OEM #56029758AB) — A weak or failing battery is the most common cause of the voltage drop that triggers a P0603 code. The battery in the Durango is an AGM type, typically Group H7 or H8.
  Trusted brands: Mopar, Interstate, DieHard, Odyssey
  OEM price range: $250-$490
  Aftermarket price range: $180-$350
• Battery Terminal Connectors — If the original terminals are too corroded or damaged to be cleaned effectively, they must be replaced to ensure a solid connection.
  Trusted brands: Dorman, Standard Motor Products, Mopar
  OEM price range: $20-$50
  Aftermarket price range: $10-$25
• Engine Ground Strap (OEM #68349162AA) — If a main ground connection is corroded or broken, it can cause intermittent power loss to the PCM. Replacing the strap is often easier than trying to repair a frayed or corroded original.
  Trusted brands: Mopar
  OEM price range: $25-$40
  Aftermarket price range: $15-$30

Technical Service Bulletins (TSBs) & Recalls

• While no TSBs were found specifically for the Dodge Durango and P0603, TSBs from other manufacturers like Nissan (e.g., NTB21-027) confirm that P0603 is commonly set due to low battery voltage from the vehicle sitting for an extended time, reinforcing the diagnostic approach of checking the battery first.
• Dodge TSB 21-027-15 REV. C addresses reprogramming the Transmission Control Module (TCM) for shift quality issues on 2015 models. While not directly for P0603, it shows that PCM/TCM software updates are a common practice to resolve drivability symptoms that can accompany a P0603 code.

Platform-Specific Known Issues

• The Totally Integrated Power Module (TIPM) used in 2011-2013 Durangos (and other Chrysler products) is notorious for causing difficult-to-diagnose electrical problems. A failing fuel pump relay inside the TIPM, for example, can cause hard starting and battery drain, which could indirectly lead to a P0603 code. This was the subject of several recalls (FCA recalls R09, V62, 14V530, 15V115).
• The main battery is located under the front passenger seat, requiring removal of a floor cover for access. This can make routine inspection and service less convenient. For models with Engine Start-Stop (ESS) from 2017-2021, a second auxiliary battery is also present to power electronics when the engine is off. A failure of this auxiliary battery can also cause system voltage instability and trigger codes.

Mechanic-Grade Diagnostic Values

• Voltage Drop Test on PCM Ground Circuit — expected: Less than 100mV (0.1V). Failure: A reading higher than 100mV indicates a poor ground connection that needs to be cleaned or repaired.
• Voltage Drop Test on PCM Power Feed Circuit (Keep Alive Memory) — expected: Less than 200mV (0.2V). Failure: A reading higher than 200mV indicates excessive resistance in the power supply wire or connections (e.g., at the TIPM or fuse).
• Resistance of Ground Straps to Chassis — expected: Less than 0.5 Ohms. Failure: A reading higher than 0.5 Ohms indicates a corroded or failing ground strap that should be cleaned or replaced.

Scan Tool Commands That Help

• wiTECH (Dodge/Chrysler OEM Tool): View PCM Data > 'PCM Uptime Counter' or 'Time Since Key Off' — This can help determine if the PCM is unexpectedly losing power and resetting its internal timer, which would be a strong indicator of a power supply or ground interruption that causes P0603.
• wiTECH (Dodge/Chrysler OEM Tool): TIPM Actuator Tests — For 2011-2013 models, this allows a technician to command relays within the TIPM (like the fuel pump relay) on and off to verify their function. If a relay doesn't respond, it points to an internal TIPM fault that could be causing battery drain and P0603.

Wiring & Ground Locations

• PCM — In the engine compartment, typically on the passenger side, near the firewall or shock tower, under a plastic cover.. This is the module setting the code. Its power and ground connections are critical. The main connectors can be tricky to remove without damaging the locking tabs.
• G901A — Left rear of the engine compartment.. This is a primary engine compartment ground point. Corrosion or looseness here can affect multiple systems, including the PCM.
• G903A / G907A — Right front of the engine compartment.. Another key engine compartment ground point. Its integrity is crucial for stable sensor and module operation.
• G909A — Right rear of the engine compartment, near the underhood power distribution center (TIPM).. This ground is physically close to the main power center and PCM, making it a critical ground to inspect for any power-related codes.
• G918A — Near the battery (under the front passenger seat).. This is the main chassis ground for the battery. A poor connection here is equivalent to a loose battery terminal and is a very common cause for P0603.

Real Owner Repair Stories

• DodgeDurango.net forum user (2012 Dodge Durango 5.7L Hemi) — Check engine light with code P0603, occasionally rough idle after startup.
  ❌ Tried (didn't work) Clearing the code (it came back within two days)., Having the battery tested at a parts store (it tested 'good').
  ✅ What actually fixed it The owner accessed the battery under the passenger seat and found the negative terminal clamp was not fully tightened. Although it felt snug by hand, it could be slightly twisted with a wrench. After disconnecting, cleaning the post and clamp, and tightening it securely with a socket wrench, the code was cleared and did not return.

When the Usual Fixes Don't Work

• While a weak battery is the number one cause, a P0603 that returns after a new battery has been installed points towards a different problem. The two most likely scenarios are: 1) A faulty charging system (alternator) that is not properly charging the new battery, or 2) A parasitic draw that is draining the new battery overnight. Before suspecting a faulty PCM, a full parasitic draw test and charging system analysis should be performed.

OEM Part Supersession History

• 68434931AA → 68434931AB, then 68434931AC — Revisions to address hardware or software issues.
  Heads up: When replacing a PCM, it is critical to use the latest available part number compatible with the vehicle's VIN and calibration. Using an older or incorrect hardware version can cause other system incompatibilities.
• R5150588AC → 68434931AC — Part number consolidation and updates.

Model Year Variations Within This Range

• 2011-2013: These models use the Totally Integrated Power Module (TIPM) which is a known high-failure item. Internal relays, particularly for the fuel pump, can fail and cause battery drain, leading to a P0603. The diagnostic path for these years must include considering the TIPM as a primary suspect after basic battery checks.
• 2017-2021 (with Engine Start-Stop): These models are equipped with a main battery and a smaller auxiliary battery. The auxiliary battery powers the vehicle's electronics when the engine is stopped. A failure of this auxiliary battery or the dual battery control system can cause voltage fluctuations and trigger a P0603, even if the main battery tests as good.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• 5.7L HEMI Lifter/Camshaft Failure ('Hemi Tick') 🔴 High — Common on engines approaching or exceeding 100,000 miles, especially those with extended idle times. The failure often starts as a light ticking noise that gets progressively worse, eventually leading to a misfire code (e.g., P0305).
• Totally Integrated Power Module (TIPM) Failure 🔴 High → Shop Fuse Box — Most prevalent on 2011-2013 models. Can cause a wide array of electrical problems, including no-start conditions, stalling, and erratic behavior of lights/wipers. (Ref: Recalls 14V-530, 15V-115, V62 (Fuel Pump Relay))
• Uconnect 8.4" Screen Delamination 🟠 Medium — Common on models from 2017 and newer. The screen's outer layer bubbles or peels, leading to 'ghost touches' where the system acts on its own, and eventual touchscreen failure. (Ref: Stellantis internal advisory S2108000130 (not a formal recall).)
• Water Pump Failure 🟠 Medium — The water pump on the 5.7L Hemi is known to fail, causing coolant leaks and potential overheating. This is a common maintenance item for many owners.
• Broken Exhaust Manifold Bolts 🟠 Medium — Heat cycles cause the steel manifold bolts to break, leading to an exhaust leak. This creates a ticking noise, often mistaken for the 'Hemi Tick' from lifters, especially on a cold start. (Ref: TSB 09-019-23 (for 2019-2022 models, but the issue affects earlier years as well))
• Electronic Shifter Issues 🔴 High — Primarily affects 2012-2014 models with the 'monostable' electronic shifter. The design could lead to drivers unintentionally leaving the vehicle out of Park. (Ref: Recall S27 / NHTSA 16V-240)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this electrical code, used parts are generally not recommended for the core components. However, simple, non-wear items like a factory ground strap, battery cable, or PCM mounting bracket are perfectly acceptable to source from a junkyard if they are in excellent physical condition.

Donor-vehicle mileage cap: roughly under 100000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For cables or straps, inspect for any green or white corrosion, especially under the heat shrink near the terminals.
• Ensure wire insulation is not brittle, cracked, or oil-soaked.
• Verify terminal ends (eyelets) are not bent, broken, or excessively corroded.

OEM-only on this vehicle (don't cheap out):

• Powertrain Control Module (PCM)
• Totally Integrated Power Module (TIPM)

Aftermarket brands forum-validated for this vehicle:

• Batteries: Interstate, Odyssey, DieHard (AGM Type)
• Battery Terminals/Cables: Dorman, Standard Motor Products (SMP)

Brands owners have reported issues with on this vehicle:

• Unknown or 'no-name' remanufactured PCMs from online marketplaces. PCM replacement requires a reputable vendor like Flagship One or Solo PCMs that programs the unit to your VIN and provides a warranty.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0305 — A misfire code that may appear if the vehicle is suffering from the 'Hemi Tick' (lifter/camshaft failure), a known high-severity issue for the 5.7L engine.
• U1100 — Communication or voltage-related codes often accompany P0603 when the TIPM (Totally Integrated Power Module) fails on 2011-2013 models.

Frequently Asked Questions