P1004 on 2007-2008 Chrysler Pacifica 4.0L: Short Runner Valve Causes and Fixes

What's Unique About the 2007-2008 Chrysler Pacifica

For the 2007 Pacifica 4.0L specifically, this code is the subject of a Technical Service Bulletin (TSB 18-003-07 Rev. A). This TSB notes that for vehicles built before February 5, 2007, the primary cause is often a software calibration issue, not a hardware failure. A dealership must perform this software update before replacing any parts. Therefore, unlike on many other vehicles where the actuator is immediately replaced, the first diagnostic step for an eligible Pacifica 🎬 Watch: A professional mechanic's guide to diagnosing the P1004 code. is a potential PCM software update.

Symptoms You May Notice

• Check Engine Light illuminated
• Reduced engine power, especially when accelerating or at high RPM
• Engine hesitation
• Rough or unstable idle
• Decreased fuel economy
• In some cases, a ticking noise from the engine bay that is resolved by replacing the actuator.

Most Likely Causes

1. Outdated Powertrain Control Module (PCM) Software 🔴 High Probability → Shop Engine Control Module (ECM) Specifically addressed by Chrysler TSB 18-003-07 Rev. A for 2007 models built before 02/05/2007. The original software calibration was too sensitive and could set the P1004 code intermittently even with a functional SRV system.
   How to confirm: A Chrysler dealership or a qualified shop with access to OEM software (wiTECH) must check the vehicle's current software calibration against the TSB. The vehicle's build date is on the driver's side door jamb sticker. The dealer cost for a reflash can range from $100 to $250.
   Typical fix: Reprogramming (flashing) the PCM with the updated software.
   Est. part cost: $0
2. Failed Short Runner Valve (SRV) Actuator 🔴 High Probability → Shop Engine Intake Manifold The actuator motor is a common failure point across many Chrysler products using this engine family due to internal wear or electrical failure.
   How to confirm: After ruling out the TSB, remove the actuator (four 10mm bolts). Manually check if the intake runner linkage moves freely. If it does, the actuator is the prime suspect. It can be bench-tested by applying 12V power and ground to the appropriate pins to see if the motor operates. With the connector clip facing up, the left pin is ground and the right pin is positive.
   Typical fix: Replace the Short Runner Valve actuator.
   Est. part cost: $330-$520
3. Sticking Intake Manifold Runner Flaps 🟡 Medium Probability → Shop Engine Intake Manifold Carbon and oil deposits from the PCV system can accumulate in the intake manifold over time, causing the plastic runner flaps to bind. This prevents the actuator from moving them through their full range of motion.
   How to confirm: Remove the SRV actuator. Attempt to move the exposed runner linkage by hand. It should rotate smoothly with minimal resistance. If it is stuck, binds, or feels gritty, the problem is internal to the manifold. Some mechanics note it should feel smooth, not hard to turn.
   Typical fix: In severe cases, the entire intake manifold assembly must be replaced. Some success has been reported by cleaning the runners with specialized intake cleaning chemicals, but this is often a temporary fix as the carbon buildup returns.
   Est. part cost: $500-$800 for a new manifold assembly

Rare But Worth Checking

• Damaged Wiring or Electrical Connector: While less common than actuator failure, the wiring harness leading to the SRV actuator can become brittle or damaged, causing an intermittent connection. Always inspect the connector and nearby wiring for signs of chafing, corrosion, or broken wires before replacing parts.

Diagnosis Steps

1. Check the vehicle's build date on the driver's side door jamb. If it was built before February 5, 2007, contact a Chrysler dealer to see if TSB 18-003-07 Rev. A (PCM reflash) has been performed or is applicable. This should be your first step.
2. If the TSB does not apply or has already been performed, locate the Short Runner Valve (SRV) actuator on the driver's side of the upper intake manifold. It is held on by four 10mm bolts.
3. Inspect the electrical connector and wiring going to the actuator for any visible damage, corrosion, or loose connections. The red locking tab must be pulled back before depressing the release clip.
4. Remove the four 10mm bolts holding the SRV actuator to the intake manifold and pull the actuator straight out. An extension may be needed for the bottom bolt.
🎬 Watch this step-by-step walkthrough for replacing the runner valve.
5. With the actuator removed, use your fingers to gently try and rotate the plastic linkage on the intake manifold that the actuator engages with. It should move smoothly through its range of motion. If it is stuck or binding, the intake manifold is faulty and needs cleaning or replacement.
6. If the linkage moves freely, the SRV actuator is the most likely cause. You can bench test the actuator by applying 12V to its pins to confirm it actuates.
7. Replace the SRV actuator. Be sure to transfer the old o-ring or use the new one supplied with the part. Lubricating the o-ring with a little engine oil can help it seal properly.
8. Clear the code with a scanner and perform a drive cycle to confirm the fix. The car must complete certain drive cycles for all monitors to be ready.

Parts You'll Likely Need

• Short Runner Valve (SRV) Actuator (OEM #4593676AC) — This is the electric motor that controls the intake runner flaps. It is the most common hardware failure for code P1004 after the software TSB has been ruled out.
  Trusted brands: Mopar, Dorman (P/N: 911-907)
  OEM price range: $331-$370.
  Aftermarket price range: $50-$150

Technical Service Bulletins (TSBs) & Recalls

• 18-003-07 REV. A - Flash: MIL Illumination DTC P1004 - Short Runner Valve Performance.
• Bulletin #9001645 - This manufacturer bulletin explicitly cautions technicians not to replace the intake manifold for a short runner valve (SRV) fault such as P1004, P2008, P2016, or P2017, advising instead to follow specific service procedures to investigate the actuator.

Platform-Specific Known Issues

• Chrysler issued TSB 18-003-07 Rev. A, which states that for 2007 Pacifica 4.0L models built before February 5, 2007, a PCM software update is the primary fix for a P1004 code.
• A user on ChryslerForum.com with a 2007 Pacifica 4.0L reported being quoted $1200 by a dealer to replace the plenum manifold and actuator for a P1004 code, highlighting the importance of diagnosing the TSB first.

Mechanic-Grade Diagnostic Values

• SRV Actuator PWM Feedback Signal (via Scan Tool) — expected: De-energized: 50% (+/- 2%), Energized: 80% (+/- 2%). Failure: Readings outside of these ranges indicate a faulty actuator or circuit issue.
• SRV Control Circuit Resistance — expected: Below 5.0 ohms. Failure: Resistance above 5.0 ohms indicates an open or high resistance in the control circuit wiring between the PCM and the actuator.
• ASD Relay Output Circuit Voltage at SRV Connector — expected: Bright illumination on a 12V test light connected to ground.. Failure: A dim or non-illuminated test light indicates an open or high resistance in the ASD relay output circuit.

Scan Tool Commands That Help

• Chrysler wiTECH or equivalent professional scan tool: SRV Solenoid Control State — This bidirectional control allows a technician to command the SRV actuator on and off to verify its mechanical operation and test the control circuit. The test may not be allowed by the PCM if the DTC is active, so clearing codes first may be necessary.
• Chrysler wiTECH or equivalent professional scan tool: Auto Shutdown (ASD) Relay Control State — This command is used to verify that the power supply circuit to the SRV actuator is functioning correctly. By actuating the ASD relay, you can check for proper voltage at the SRV harness connector.

Wiring & Ground Locations

• G100 — Left front of the engine compartment, connecting the battery negative cable to the chassis.. A poor main chassis ground can cause a variety of unpredictable electrical issues, including faulty sensor readings and incorrect actuator performance.
• G101 — Lower left side of the engine block.. This is a primary engine block ground. A bad connection here can affect the grounding of components mounted to the engine.
• G102 — Left side of the engine compartment.. Provides a ground path for various components in the engine bay. Ensuring it is clean and tight is part of good diagnostic practice for any electrical fault.
• SRV Actuator Connector — On the SRV actuator, driver's side of the upper intake manifold.. The connector has pins for the ASD Relay Output (power), the SRV Control circuit (from PCM), and potentially signal/ground circuits. Testing for power, ground, and control signal happens at this connector.

Real Owner Repair Stories

• YouTube channel 'DC Auto Enhancement' (2010 Dodge Charger (LX Platform, similar 3.5L/4.0L engine family)) — Check Engine Light with code P1004. Owner also noted a ticking noise they hoped would be resolved.
  ❌ Tried (didn't work) The owner went straight to component replacement based on the code.
  ✅ What actually fixed it The owner replaced the original SRV actuator with a used one from a junkyard. After clearing the codes and completing the drive cycles, the P1004 code did not return.

Documented NHTSA Reports

• An owner reported in NHTSA ODI #10549606 that their check engine light was on for a P1004 code involving the intake short runner control valve actuator, noting that a TSB exists for what they described as a faulty part acknowledged by the manufacturer.
• NHTSA ODI #10281479 describes a vehicle with 45,000 miles that failed emissions testing due to a P1004 code, which the owner identified as a known problem with an associated TSB.

OEM Part Supersession History

• 4593676AB → 4593676AC — Standard part revision by the manufacturer, likely for improved durability or minor design changes.
  Heads up: The parts are interchangeable. 4593676AC is the correct current replacement for the original 4593676AB.

Model Year Variations Within This Range

• 2007 (built before 02/05/2007): These vehicles are subject to TSB 18-003-07 Rev. A, which calls for a PCM software reflash as the primary fix for P1004, before any parts are replaced. Vehicles built after this date have the updated software from the factory.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Engine Cradle / Subframe Corrosion 🔴 High — Very common on vehicles operated in 'salt belt' states. Can become structurally unsafe, potentially allowing the engine to shift or detach. (Ref: A class-action lawsuit was filed covering 2004-2008 models. Chrysler issued limited warranty extensions and TSBs, but they were restricted to very specific build dates and regions, leaving many owners without coverage.)
• 62TE Automatic Transmission Failure 🔴 High — Common between 80,000 and 120,000 miles. Symptoms include shuddering, harsh/erratic shifting, delayed engagement, and entering 'limp mode'. (Ref: No specific recall, but numerous TSBs exist for various shift quality complaints. Common failure points are the solenoid pack/valve body and the torque converter.)
• Engine Stalling While Driving 🔴 High — Multiple owner complaints filed with NHTSA and on forums for the engine shutting off intermittently while driving, often without warning. Onset can occur at various mileages. (Ref: No specific recall. Anecdotal fixes point to issues like corroded ground wires or faulty PCM, but diagnosis can be difficult as the problem is often intermittent.)
• Engine Oil Consumption / Ticking Noise 🟠 Medium — Some owners report excessive oil consumption and engine ticking or knocking noises, sometimes leading to premature engine failure. (Ref: No specific recall. The 4.0L is an interference engine, so a timing belt failure can cause catastrophic damage.)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used OEM actuator from a junkyard can be a cost-effective solution if the failure is confirmed to be the actuator itself and not stuck runners or a software issue. Given the high cost of a new OEM part, a used part is a reasonable gamble for a DIY repair.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Check for physical damage to the housing or electrical connector.
• If possible, find a donor vehicle with lower mileage.
• Ask the seller if they offer a short warranty or return period in case the part is dead on arrival.
• Attempt to manually move the gear on the actuator; it should have some smooth resistance but not be seized.

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

• Powertrain Control Module (PCM) - Used PCMs often have VIN-locking issues and require dealer programming, making a properly sourced new or remanufactured unit a safer bet.

Aftermarket brands forum-validated for this vehicle:

• Dorman (P/N: 911-907) is a widely available aftermarket alternative, though long-term reliability compared to OEM is not well-documented in forums.

Brands owners have reported issues with on this vehicle:

• No-name, unbranded parts sold on marketplaces at exceptionally low prices may have a higher failure rate.

Real Owner Stories

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

Related OBD-II Codes

• P2008 — This is a generic code for 'Intake Manifold Runner Control Circuit/Open'. It can be set by the same root cause as P1004: an electrical failure within the Short Runner Valve (SRV) actuator or its wiring harness, which is listed as a high-probability cause.
• P0300 — This code for 'Random/Multiple Cylinder Misfire' can be a direct consequence of a malfunctioning SRV system. The context lists 'Rough or unstable idle' and 'Engine hesitation' as symptoms of P1004, which are caused by improper airflow leading to misfires.
• P2017 — A generic code for 'Intake Manifold Runner Position Sensor/Switch Circuit High'. A failure of the SRV actuator, a primary cause of P1004, often involves the internal position sensor. This code points to an electrical fault in the same component.
• P0606 — This code indicates a 'PCM Processor Fault'. The context heavily emphasizes the PCM's role, with the primary fix for P1004 being a PCM software update (TSB 18-003-07 Rev. A). A more serious internal fault in the PCM could trigger both a P1004 and a P0606.

Frequently Asked Questions