P2311 on 2015-2016 Dodge Caravan: Ignition Coil 4 Failure Causes and Fixes

What's Unique About the 2015-2016 Dodge CARAVAN

This code is common on the 3.6L Pentastar V6 engine used across many Dodge, Chrysler, and Jeep vehicles. For the Dodge Caravan, cylinder #4 is located in the front cylinder bank (closer to the radiator), making it much easier to access than the rear cylinders which require removing the intake manifold. A Technical Service Bulletin (TSB #18-069-16 REV. A) was issued for a range of P23xx codes, including P2311, indicating a known pattern of ignition faults. For a specific build range, this TSB identifies a faulty PCM as the root cause.

Diagnostic Flowchart

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

Symptoms You May Notice

• Rough or shaky idle
• Engine hesitation or stumbling during acceleration
• Noticeable loss of power
• Check Engine Light is on and steady
• Flashing Check Engine Light (indicates a severe misfire)
• Reduced fuel economy
• Engine may stall unexpectedly.

Most Likely Causes

1. Failed Ignition Coil #4 🔴 High Probability → Shop Ignition Coil Ignition coils are a common failure item on many modern engines due to constant exposure to heat and vibration, which can degrade their internal windings over time. Oil leaks from the valve cover gasket or spark plug tube seals, a known issue on the 3.6L Pentastar, can also saturate the coil boot and cause it to fail.
   How to confirm: The easiest way to confirm a bad coil is to swap it with another easily accessible coil (e.g., from cylinder #2 or #6 on the same bank). Clear the codes and drive the vehicle. If the code changes to P2305 (for cylinder #2) or P2317 (for cylinder #6), the coil is faulty. Visual inspection may reveal cracks or burn marks on the coil boot.
   Typical fix: Replace the faulty ignition coil. 🎬 See how easy it is to replace your coils and plugs. It is often recommended to replace the corresponding spark plug at the same time.
   Est. part cost: $30-$120
2. Worn or Fouled Spark Plug #4 🔴 High Probability → Shop Spark Plug Spark plugs are a regular maintenance item with a limited lifespan. A worn electrode, incorrect gap, carbon/oil fouling, or a cracked porcelain insulator can prevent a strong spark from forming.
   How to confirm: After ruling out the ignition coil, remove the spark plug from cylinder #4 and inspect it. Look for a worn-down center electrode, heavy carbon deposits, oil fouling, or cracks in the porcelain insulator. The correct spark plug gap should be 0.044 inches.
   Typical fix: Replace the spark plug. It is best practice to replace all six spark plugs at the same time if they are near the end of their service interval.
   Est. part cost: $8-$20
3. Damaged Ignition Coil Boot or Spring 🟡 Medium Probability → Shop Ignition Coil The rubber boot that seals the coil to the spark plug tube can become brittle and crack, or oil from a leaking valve cover gasket can cause it to swell and fail. This allows the spark to ground out before reaching the plug.
   How to confirm: When the ignition coil is removed, inspect the rubber boot for any cracks, burn marks, or signs of oil contamination. The boot may feel soft or swollen if exposed to oil.
   Typical fix: Replace the ignition coil boot and spring, or the entire ignition coil assembly.
   Est. part cost: $10-$25
4. Faulty Powertrain Control Module (PCM) ⚪ Low Probability → Shop Engine Control Module (ECM) TSB #18-069-16 REV. A specifically notes that for vehicles built between July 27, 2015, and September 11, 2015, a faulty PCM could be the cause for P23xx codes. The bulletin states the cause is an improperly coated atmospheric vent, leading to inadequate environmental protection. For affected VINs, the PCM must be replaced without further diagnosis.
   How to confirm: This should be the last resort after all other possibilities have been ruled out. A technician can check for a bad pin fit at the PCM connector, which can cause the same symptoms. Diagnosis involves checking the coil driver circuit in the PCM.
   Typical fix: The PCM must be replaced and reprogrammed by a dealer or qualified shop. Remanufactured, pre-programmed PCMs are available from various sellers for around $300.
   Est. part cost: $500-$1000

Rare But Worth Checking

• Damaged Wiring or Connector: The wiring harness leading to ignition coil #4 could be damaged, or the connector pins could be corroded or loose. A poor pin fit at the PCM connector is also a known, though rare, cause that can be diagnosed by a technician. This should be checked if a new coil and plug don't solve the issue.

Diagnosis Steps

1. Read the trouble codes with an OBD-II scanner and confirm P2311 is present. Note any other codes, like P0304.
2. Locate cylinder #4. On the 3.6L Pentastar in a Caravan, the cylinders are numbered 1-3-5 on the rear bank (near firewall) and 2-4-6 on the front bank (near radiator). Cylinder #4 is the middle cylinder on the front bank.
3. Swap the ignition coil from cylinder #4 with the coil from cylinder #2 (the front-most cylinder on the same bank).
4. Clear the codes with the scanner, start the engine, and go for a short drive to see which code returns.
5. If code P2305 (Ignition Coil 2 Secondary Circuit) appears, the ignition coil you moved is faulty and must be replaced.
6. If code P2311 returns, the coil is likely good. The problem is probably the spark plug, wiring, or PCM.
7. Remove and inspect the spark plug from cylinder #4. Check for oil in the spark plug tube, which indicates a leaking valve cover or tube seal. Replace the plug if it's worn, fouled, or damaged. It's best to replace all six if they are old.
8. If the plug and coil are good, carefully inspect the wiring connector at coil #4 for any corrosion, damage, or loose pins.
9. If no other cause is found, check if your vehicle's VIN falls within the build dates (July 27, 2015 - Sept 11, 2015) for TSB #18-069-16 REV. A, which would point to a mandatory PCM replacement.

Parts You'll Likely Need

• Ignition Coil (OEM #5149168AJ (supersedes 5149168AH, 5149168AI)) — This is the most frequent point of failure for a P2311 code due to heat and electrical stress, as well as potential oil contamination from known engine leaks.
  Trusted brands: Mopar, NGK, Delphi, Denso
  OEM price range: $80-$120
  Aftermarket price range: $30-$75
• Spark Plug (OEM #SP149125AE (Mopar Iridium)) — As a standard maintenance item, a worn spark plug can no longer create a strong enough spark, causing this code. It should always be inspected and often replaced with the coil.
  Trusted brands: NGK, Champion
  OEM price range: $15-$25
  Aftermarket price range: $8-$15

Related Codes That Often Appear With This One

• P0304 — P0304 means 'Cylinder 4 Misfire Detected'. P2311 is the specific cause (no spark), while P0304 is the resulting effect (the misfire itself). 🎬 Watch: Understanding the causes and fixes for a P0304 misfire code. They almost always appear together.
• P0300 — P0300 means 'Random/Multiple Cylinder Misfire'. If the PCM is failing as described in TSB 18-069-16, it can cause multiple ignition coil circuit faults, leading to a P0300 code alongside specific P23xx codes.

Technical Service Bulletins (TSBs) & Recalls

• 18-069-16 REV. A: Addresses MIL illumination for various misfire (P030x) and ignition coil circuit (P23xx) codes. For vehicles built between 07/27/2015 and 09/11/2015, it mandates PCM replacement as the fix due to a manufacturing defect.

Platform-Specific Known Issues

• TSB #18-069-16 REV. A was issued by Chrysler for 2015-2016 models, including the Grand Caravan. For vehicles built between July 27, 2015, and September 11, 2015, it advises that a faulty PCM with an 'improperly coated atmospheric vent' could be the root cause of P23xx codes and must be replaced.
• Oil leaks from the valve cover gasket and spark plug tube seals are a common issue on the 3.6L Pentastar engine, which can lead to premature failure of the ignition coils by saturating the boots.

Mechanic-Grade Diagnostic Values

• Ignition Coil Primary Winding Resistance — expected: 0.4 to 2.0 Ohms. Failure: A reading outside this range indicates a faulty coil.
• Ignition Coil Secondary Winding Resistance — expected: 5,000 to 13,000 Ohms (5 kΩ to 13 kΩ). Failure: A reading significantly outside this range, such as below 1 kΩ (short) or above 20 kΩ (open), indicates a faulty coil.
• Ignition Coil Connector Power Supply Voltage — expected: 12 Volts DC with ignition key on. Failure: No voltage indicates an issue with the ASD relay or the wiring from the relay.
• Ignition Coil Connector Control Circuit — expected: A test light connected to battery positive should blink while cranking the engine.. Failure: No blinking indicates a problem with the PCM driver or the wiring between the PCM and the coil.
• Continuity of Coil Control Wire — expected: < 0.2 Ohms. Failure: High resistance indicates a break or corrosion in the wire between the PCM and the coil connector.

Scan Tool Commands That Help

• wiTECH (or equivalent professional scanner): Actuate ASD Relay — Use this command with the ignition on (engine off) to force the Auto Shut Down (ASD) relay on. This allows for testing the 12V power supply wire at all ignition coil connectors without the engine running.

Wiring & Ground Locations

• Ignition Coil #4 Control Pin at PCM — On one of the main PCM connectors (may be labeled C1, C2, etc.).. Pin 75 is the specific driver for ignition coil #4. The wire is typically White (WHT). Testing for continuity and shorts on this specific wire is critical when a new coil and plug do not fix the P2311 code.
• Ignition Coil #4 Connector — On top of the valve cover, connected to the ignition coil for the middle cylinder on the front bank.. This 2-pin connector provides power and the control signal. One pin should have 12V from the ASD relay, and the other is the control signal from PCM Pin 75. Checking for voltage, signal, and pin integrity here is a primary diagnostic step.

Model Year Variations Within This Range

• 2015-2016: While an updated 3.6L Pentastar engine was introduced in 2016 for other Chrysler/Dodge vehicles, the Dodge Grand Caravan (RT platform) continued to use the first-generation 3.6L engine through its entire production run to 2020. Therefore, there are no significant mechanical engine differences affecting this repair between the 2015 and 2016 models. The primary known variation is the PCM issue affecting a specific 2015 build range per TSB #18-069-16.