P0201 on 2004-2009 Dodge Durango 4.7L V8: Injector Circuit Causes and Fixes

What's Unique About the 2004-2009 Dodge Durango

For Dodge 4.7L V8 engines of this era, wiring issues are a very common cause for injector circuit codes. While no specific Technical Service Bulletin (TSB) for the 4.7L Durango points to a widespread design flaw, owner experiences frequently highlight problems with brittle connectors or chafed wiring leading to the injector. It is important to note that while some other Dodge/Jeep vehicles with 4.7L engines had a known issue with injector wiring integrated into the valve cover gasket (per TSB 18-004-08), the second-generation Durango does not share this design, making inspection more straightforward. A thorough visual check of the harness near cylinder 1 is a critical first step before assuming the injector itself has failed. Additionally, a safety recall for some 2004 Ram 4.7L trucks for a generator wire shorting on a valve cover stud highlights a general risk of wire chafing in this engine bay.

Symptoms You May Notice

• Check Engine Light is on
• Rough or shaking idle
• Engine misfire, which may feel like a stutter or hesitation during acceleration
• Reduced engine power and poor throttle response
• Worse than normal fuel economy
• Smell of gasoline from the engine bay if the injector is physically leaking
• Engine may backfire through the intake
🎬 Watch: Understanding the causes and fixes for the P0201 code

Most Likely Causes

1. Faulty Cylinder 1 Fuel Injector 🔴 High Probability → Shop Fuel Injector Fuel injectors are wear-and-tear components. The internal electronic coil can fail over time by burning out, creating an 'open' circuit which prevents it from activating.
   How to confirm: The most definitive test is to swap the cylinder 1 fuel injector with another one (e.g., cylinder 3). Clear the codes and drive the vehicle. If the code changes to P0203, the injector is confirmed to be faulty. You can also test the injector's resistance with a multimeter; it should be around 10.8-13.2 ohms. A reading of infinity (OL) means it's open and bad.
   Typical fix: Replace the faulty fuel injector. It is often recommended to replace all injectors as a set on high-mileage vehicles to ensure balanced fuel delivery and avoid future failures.
   Est. part cost: $50-$120
2. Wiring Harness or Connector Issue 🟡 Medium Probability Engine heat and vibration can make the wiring insulation brittle and cause the plastic connectors to crack or become loose, leading to a poor connection or an open circuit. Wires can become frayed or exposed right at the back of the connector.
   How to confirm: Visually inspect the wiring going to the cylinder 1 injector for any signs of cracking, chafing, or melting. Wiggle the harness while the engine is running to see if it affects the idle. Use a noid light to test for a signal pulse at the connector while the engine is cranking; if the light doesn't flash, the problem is in the wiring or the PCM.
   Typical fix: If the connector is damaged, a new pigtail can be spliced in. If the wire is broken, it must be repaired with solder and heat shrink. Ensure the harness is properly secured away from hot or moving parts.
   Est. part cost: $15-$30 for a connector pigtail
3. Faulty Powertrain Control Module (PCM) ⚪ Low Probability → Shop Engine Control Module (ECM) While not common, the internal driver circuit for the injector within the PCM can fail, especially if an external wiring short damages the board. Multiple forum users with 4.7L engines have confirmed a bad PCM was the ultimate cause after replacing injectors and pigtails.
   How to confirm: This is typically diagnosed by exclusion. If the fuel injector and the wiring have both been tested and are known to be good (e.g., noid light doesn't flash, but wiring continuity from PCM to connector is good), the PCM is the likely culprit. A professional diagnosis is recommended before replacing the PCM.
   Typical fix: Replace and reprogram the Powertrain Control Module. Some owners have had success sending their original PCM out for repair.
   Est. part cost: $200-$500+

Diagnosis Steps

1. Read the code with an OBD-II scanner and confirm P0201 is present. Note any other codes, especially P0301.
2. Locate cylinder 1 on the 4.7L V8. It is the front-most cylinder on the passenger side of the engine.
3. Visually inspect the electrical connector and wiring going to the cylinder 1 fuel injector. Look for obvious damage, corrosion, frayed wires at the back of the connector, or loose connections.
4. Disconnect the connector and check for a pulse signal using a noid light while a helper cranks the engine. If the light flashes, the wiring and PCM are likely okay, and the injector is the problem. If it does not flash, the problem is upstream in the wiring or PCM.
5. To confirm a bad injector, turn the ignition off and test the resistance across the two pins of the injector itself using a multimeter. A good injector should read between 10.8-13.2 ohms. A reading of infinity (OL) confirms an open/failed injector.
🎬 See how to test injector resistance with a multimeter
6. As an alternative confirmation, swap the cylinder 1 injector with the cylinder 3 injector (the next one back on the same side). Clear the codes with the scanner.
7. Drive the vehicle until the Check Engine Light returns. If the new code is P0203, the fuel injector you moved is faulty and must be replaced.
8. If the code P0201 returns after the swap, or if the noid light did not flash, the problem lies in the wiring harness or the PCM. Perform a continuity test on the two wires for the injector circuit (per the service manual, the (K11) control circuit and the (A955) ASD relay circuit) between the injector connector and the PCM connector to find the open or short. Resistance on the control wire should be less than 5.0 ohms.

Parts You'll Likely Need

• Fuel Injector (OEM #53032704AB (2004-2007), 4591851AB (2008-2009, Flex Fuel)) — This is the most common part to fail for a P0201 code after wiring issues have been ruled out.
  Trusted brands: Mopar, Bosch, Standard Motor Products (SMP), VDO
  OEM price range: $90-$150
  Aftermarket price range: $50-$100
• Fuel Injector Connector Pigtail — If the plastic locking tab on the connector is broken, the terminals are corroded, or wires are frayed at the connector, replacing the pigtail is necessary to ensure a solid electrical connection. 🎬 Watch: Step-by-step guide to replacing a fuel injector connector
  Trusted brands: Dorman (e.g., 85137), Standard Motor Products (e.g., HP3980)
  OEM price range: $20-$40
  Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

• P0301 — P0301 means 'Cylinder 1 Misfire Detected'. Since P0201 indicates a fault in the fuel supply circuit for cylinder 1, the cylinder cannot fire correctly, which directly causes a misfire.
• P0171 — P0171 means 'System Too Lean (Bank 1)'. If the cylinder 1 injector isn't firing, that bank of the engine is running with less fuel than expected, which the oxygen sensor detects as a lean condition.

Technical Service Bulletins (TSBs) & Recalls

• TSB 18-004-08 / 18-024-03: While these TSBs are frequently mentioned for P020X codes on 4.7L and Magnum engines, they address a known problem where the injector wiring harness fails inside the valve cover gasket. This is an important distinction, as this design is NOT typically found on the 2004-2009 Durango 4.7L, but is common on Ram and Dakota trucks. Awareness of this TSB can prevent confusion during diagnosis.
• TSB Bulletin #9002688: A manufacturer service bulletin for related Dodge models notes that before replacing injectors for codes P0201 through P0206, technicians should ensure that the wiring loom or connector in the valve cover gasket is not the root cause.
• NHTSA Recall D42 (related): While not for P0201 directly, a 2004 safety recall for some 4.7L Dodge Ram trucks involved the generator wiring harness potentially contacting a valve cover stud and shorting out, which could cause an underhood fire. This adds context to the general potential for wire chafing and shorting in the engine bay of this engine family.

Mechanic-Grade Diagnostic Values

• Fuel Injector Coil Resistance (2004-2007) — expected: 10.8 - 13.2 Ohms at 68°F (20°C). Failure: A reading of infinity (OL) indicates an open circuit; a reading near zero indicates a shorted coil.
• Fuel Injector Coil Resistance (2008-2009 FFV) — expected: ~12.5 Ohms. Failure: Significant deviation from this value, OL, or near-zero ohms indicates a faulty injector.
• Injector Control Circuit (K11) Wire Resistance — expected: Below 5.0 Ohms. Failure: Resistance above 5.0 Ohms indicates high resistance or an open in the wire between the PCM and the injector connector.
• Injector Power Feed (ASD Relay Output) Voltage — expected: Battery voltage (12V+) with key on. Failure: Voltage below 10V or no voltage indicates a problem with the ASD relay or the wiring from the relay.

Scan Tool Commands That Help

• wiTECH or other professional bidirectional scanner: Injector Kill / Actuator Test — This function allows a technician to command a specific injector to stop firing while the engine is running. If killing cylinder 1 has no effect on the engine's idle, it confirms that cylinder was not contributing, which supports the P0201 diagnosis. Conversely, some tools can perform an 'injector buzz test' with the engine off to audibly confirm the injector coil is activating.

Wiring & Ground Locations

• Cylinder 1 Injector Control Circuit — This is the (K11) circuit wire running from the C2 PCM harness connector to the cylinder 1 fuel injector connector.. An open or short to ground on this specific wire will cause the PCM to lose control of the injector and set P0201. Testing continuity on this wire is a critical step if a noid light test fails.
• ASD Relay Output Circuit — This is the (A955) circuit wire that provides 12V+ power from the Auto Shutdown (ASD) relay to all fuel injectors on that bank.. While a failure here would likely affect multiple injectors, a partial failure or high resistance on the branch feeding only cylinder 1 could cause P0201. It is the power supply side of the circuit.
• Auto Shutdown (ASD) Relay — Located in the underhood fuse box (Power Distribution Center). The lid of the box has a diagram labeling the 'ASD' relay.. The ASD relay supplies battery voltage to the fuel injectors (and ignition coils). If the relay is faulty, it can cause a no-start or stalling, and could potentially fail in a way that affects only one injector's power feed, though this is rare.
• Engine Block Ground — A primary ground strap typically runs from the rear of the engine block to the firewall/body on the passenger side.. A poor engine ground can cause a host of erratic electrical issues, including problems with sensor readings and actuator functions. While not a direct cause of a single injector circuit code, verifying the main engine ground is clean and tight is a fundamental step in any electrical diagnosis.

Real Owner Repair Stories

• DodgeForum.com user 'Derrick Covington' (2001 Dodge Durango 4.7L) — Rough idle, backfire through intake, burning rich smell, codes P0201 and P0202 initially, then only P0201.
  ❌ Tried (didn't work) Replaced fuel injectors, Replaced spark plugs, Replaced Throttle Position Sensor (TPS), Replaced fuel pump, Replaced the pigtail connector for the cylinder 1 injector
  ✅ What actually fixed it The user performed a noid light test after replacing the pigtail and found there was still no pulse signal to the injector. The final diagnosis, though not explicitly confirmed with a follow-up post, was a failed Powertrain Control Module (PCM), as all other components in the circuit had been replaced or tested.

OEM Part Supersession History

• 53032704AB → 53032704AC — Standard part revision.
  Heads up: These parts are for the 2004-2007 standard and Flex Fuel 4.7L engines and are generally interchangeable.
• 4591851AA → 4591851AB — Standard part revision.
  Heads up: This part is for the updated 2008-2009 4.7L 'Next Generation' Flex Fuel V8 and is NOT interchangeable with the earlier 53032704AB/AC injectors.

Model Year Variations Within This Range

• 2008-2009: For the 2008 model year, Dodge introduced an updated 4.7L V8 with a higher compression ratio, dual spark plugs per cylinder, and improved intake, boosting horsepower to ~303-310 hp. This engine is often Flex-Fuel (E85) capable and uses a different fuel injector (PN 4591851AB) than the 2004-2007 models. Using the wrong injector will cause fuel trim issues.

Diagnostic Flowchart

Real Owner Stories

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

Related OBD-II Codes

• P0301 — Cylinder 1 Misfire Detected. This is a direct companion code to P0201, as an open injector circuit prevents fuel delivery, causing cylinder 1 to misfire.
• P0203 — Cylinder 3 Injector Circuit/Open. This code will appear during diagnosis if you swap the suspected faulty cylinder 1 injector to cylinder 3 and the problem follows the injector.
• P0205 — Cylinder 5 Injector Circuit/Open. Mentioned by owners on forums as appearing simultaneously with P0201 during intermittent rough running, sometimes pointing to a failing PCM.
• P0202 — Cylinder 2 Injector Circuit/Open. A related injector circuit code that shares the same ASD relay circuit (A955) and PCM driver architecture on the 4.7L V8.
• P0204 — Cylinder 4 Injector Circuit/Open. Another related injector circuit code for the 4.7L V8 engine, sharing the same potential failure points (injector coil, wiring, or PCM).

Frequently Asked Questions