P0507 on 2005-2011 Dodge Dakota: Causes and Fixes for High Idle

What's Unique About the 2005-2011 Dodge Dakota

The 2005-2011 Dodge Dakota spans a key technology change in idle control. Earlier models (roughly 2005-2007) use a separate Idle Air Control (IAC) valve to manage idle speed. Later models (roughly 2008-2011) switched to an Electronic Throttle Body (ETB) where idle is managed by a motor controlling the throttle plate directly. Regardless of the system, this platform's 3.7L and 4.7L engines are particularly prone to vacuum leaks from brittle PCV hoses and elbows, especially the one located on the rear of the intake manifold near the firewall, which is a very common cause of P0507.

Generation note: This guide covers the third-generation Dodge Dakota. However, a significant change occurred around 2007-2008. Early models (approx. 2005-2007) use an Idle Air Control (IAC) valve. Later models (approx. 2008-2011) use an Electronic Throttle Body (ETB) and do not have a separate IAC valve. Diagnostic steps and parts will differ. The most common cause, a cracked PCV hose/elbow, is prevalent across all years of this generation.

Symptoms You May Notice

• Check Engine Light is on
• Engine idle speed is noticeably high (e.g., over 1000 RPM at warmup)
• Rough or unstable idle
• Vehicle may 'creep' forward when stopped with the brake applied
• Harsh engagement when shifting from Park to Drive or Reverse
• Increased fuel consumption
• A hissing sound from the engine bay, indicating a vacuum leak
🎬 Watch: Understanding the causes and fixes for the P0507 code

Most Likely Causes

1. Cracked or Leaking PCV Hoses/Elbows 🔴 High Probability The rubber elbows and hoses in the PCV (Positive Crankcase Ventilation) system are exposed to intense heat and oil vapors. The elbow on the rear of the intake manifold is a notorious failure point; it becomes brittle, cracks, or collapses, creating a significant vacuum leak.
   How to confirm: Visually inspect all PCV hoses, especially the rubber elbow connecting to the rear of the intake manifold near the firewall. This may require a mirror and flashlight. A hissing sound near these hoses at idle is a strong indicator. A smoke test is the definitive way to find the leak, as smoke will pour out of any cracks. Many owners discover the broken hose after performing other work, like changing spark plugs, where the hose was disturbed.
   Typical fix: Replace the cracked rubber elbows and any brittle sections of hose. The rear elbow is often sold as part of a larger hose assembly. Aftermarket parts from Dorman or OEM Mopar parts are available.
   Est. part cost: $15-$40
2. Dirty or Faulty Throttle Body 🟡 Medium Probability Carbon and oil residue from the PCV system can build up around the throttle plate. This prevents the plate from closing completely, allowing excess air to enter and raising the idle speed. This is a very common issue on the Electronic Throttle Body (2008+) models.
   How to confirm: Remove the air intake duct from the throttle body. If the inside of the throttle bore and the edges of the metal throttle plate are black with carbon, it needs cleaning. On ETB models, the computer may be holding the plate open slightly to compensate for the blockage; cleaning it restores proper airflow. 🎬 See this guide on how to clean your throttle body
   Typical fix: Clean the throttle body bore and plate with a dedicated throttle body cleaner and a soft brush or rag. Do not force the plate open on electronic units; have a helper turn the key to 'ON' (not start) and press the gas pedal to open the plate for cleaning. After cleaning, an idle relearn procedure is often necessary.
   Est. part cost: $5-$15 for cleaner
3. Faulty Idle Air Control (IAC) Valve 🟡 Medium Probability This only applies to earlier models (approx. 2005-2007). The valve's plunger can get stuck with carbon, or the internal motor can fail, preventing it from regulating airflow correctly at idle.
   How to confirm: Tap the IAC valve lightly; if the idle changes, the valve is likely sticking. The best way is to remove the valve (typically two Torx screws) and inspect it and its port for heavy carbon buildup. You can test the motor's resistance with a multimeter.
   Typical fix: First, try cleaning the valve's pintle and the port with throttle body cleaner. If cleaning doesn't work, or if the idle remains high, the IAC valve needs to be replaced.
   Est. part cost: $50-$150
4. Faulty PCV Valve ⚪ Low Probability The valve itself can fail, getting stuck open and creating a constant vacuum leak. While less common than the hoses cracking, it's an inexpensive maintenance item.
   How to confirm: Remove the PCV valve from the valve cover. With the engine running, you should feel strong suction on the end of the valve. If you shake it (with the engine off), it should rattle. If it's stuck open or clogged, it's bad.
   Typical fix: Replace the PCV valve. This is an inexpensive and easy maintenance item to replace. 🎬 Watch: Step-by-step PCV valve replacement for 3.7L and 4.7L engines
   Est. part cost: $10-$25

Rare But Worth Checking

• Leaking Intake Manifold Gasket: While less common than hose leaks, a leak in the intake manifold gasket can introduce unmetered air and cause a high idle. This is more likely on higher mileage vehicles. A professional smoke test is the best way to confirm this.
• Lost Idle Memory After Battery Disconnect: Sometimes, after disconnecting the battery or replacing it, the PCM can lose its learned idle values. This can cause a temporary P0507 code. Performing an idle relearn procedure or simply driving the vehicle for a few cycles can resolve this. One owner reported the code cleared after disconnecting and reconnecting the battery.

Diagnosis Steps

1. Read the code with an OBD-II scanner to confirm P0507 is the primary code. Note any other codes.
2. With the engine running, listen for audible hissing sounds around the top and rear of the engine, which would indicate a vacuum leak.
3. Turn off the engine. Remove the engine cover and air intake ducting. Get a flashlight and inspection mirror.
4. Thoroughly inspect the PCV hoses, focusing on the rubber elbow at the back of the intake manifold near the firewall. This is the most common failure point. Bend and squeeze the hoses to reveal hidden cracks.
5. If a leak isn't obvious, perform a smoke test. Feed pressurized smoke into the intake system (often through the brake booster line) and watch for smoke escaping from cracked hoses, gaskets, or the throttle body shaft.
6. Inspect the throttle body for heavy carbon buildup. If dirty, clean it carefully with throttle body cleaner. For ETB models (2008+), have a helper turn the key to 'ON' and press the accelerator to open the plate for cleaning.
7. If you have an earlier model (2005-2007), locate, remove, and clean the Idle Air Control (IAC) valve on the throttle body.
8. Check the PCV valve for proper operation. It should rattle when shaken (engine off) and have strong suction when the engine is running.
9. After any cleaning or repair, an 'Idle Relearn Procedure' may be required. This can sometimes be accomplished by disconnecting the battery for 15 minutes, reconnecting it, and letting the engine idle for 5-10 minutes, followed by a drive cycle. A more formal procedure may be needed with a scan tool.
10. Clear the codes with the scanner and drive the vehicle to see if the code returns.

Parts You'll Likely Need

• PCV Valve Hose / Elbow (OEM #53032993AF (3.7L Hose Assembly), 53032923AC (Elbow for 4.7L)) — This is the most frequent point of failure leading to vacuum leaks and a P0507 code on this specific truck. The rear elbow is especially prone to cracking.
  Trusted brands: Mopar, Dorman (e.g., 47079)
  OEM price range: $25-$50
  Aftermarket price range: $15-$30
• Idle Air Control (IAC) Valve (OEM #53032800AA (Varies by engine/year)) — A common failure on 2005-2007 models that causes high or erratic idle when stuck or dirty.
  Trusted brands: Mopar, Standard Motor Products, Hitachi
  OEM price range: $100-$175
  Aftermarket price range: $50-$100
• Electronic Throttle Body — On 2008-2011 models, if cleaning doesn't resolve the high idle, the internal motor or sensor may have failed, requiring replacement of the whole unit. This should be a last resort after ruling out vacuum leaks.
  Trusted brands: Mopar, Bosch, Dorman
  OEM price range: $250-$400
  Aftermarket price range: $150-$250

Related Codes That Often Appear With This One

• P0456 — A small EVAP leak code can sometimes be triggered by the same vacuum leaks (like a cracked PCV hose or a split EVAP purge hose) that cause P0507, as the system's integrity is compromised.

Technical Service Bulletins (TSBs) & Recalls

• TSB 18-031-08: While not directly for P0507, this TSB involves a PCM software update for some 2008 models with the 4.7L engine to address idle fluctuations (surging/hunting) after coming to a stop. If you have these symptoms along with P0507, checking for available PCM updates is worthwhile.

Platform-Specific Known Issues

• The rubber elbow for the PCV system located on the rear of the intake manifold is a well-documented failure point on Dodge 3.7L and 4.7L engines, frequently causing the P0507 code.

Scan Tool Commands That Help

• Chrysler WiTech or DRB III / Advanced Generic: Throttle Body Relearn / Idle Relearn — After cleaning or replacing the throttle body, or after disconnecting the battery, to reset the learned idle position in the PCM. This may be required if a manual relearn procedure does not resolve the high idle.
• Advanced Generic Scan Tool: Command Idle RPM Up/Down — To test the functionality of the Idle Air Control (IAC) valve (on pre-2008 models) or the electronic throttle body motor (2008+ models) by commanding a specific RPM and observing if the engine responds correctly.

Real Owner Repair Stories

• YouTube channel 'Code P0507 & P0456 Mystery Solved!' (Dodge Nitro with 3.7L V6 (engine shared with Dakota)) — Check Engine Light with codes P0507 (Idle speed performance higher than expected) and P0456 (EVAP small leak). An audible vacuum leak (hissing) was present.
  ❌ Tried (didn't work) The previous owner had replaced the gas cap with a cheap aftermarket one, which did not solve the problem.
  ✅ What actually fixed it The mechanic identified two separate vacuum leaks during visual inspection: a split in the EVAP purge valve hose going to the intake, and a hole in the PCV hose.
• NHTSA ODI #11208215 — An owner of a Dodge Nitro (sharing the Dakota's 3.7L platform) reported that the engine light came on with code P0507, noting that the vehicle occasionally felt like it lost speed or stalled during acceleration.

OEM Part Supersession History

• 53032993AC, 53032993AD, 53032993AE → 53032993AF — Part revision and improvement by the manufacturer.
  Heads up: The newest part number, 53032993AF, is the correct replacement for the previous versions for the 3.7L V6 engine.

Model Year Variations Within This Range

• 2007: The 3.7L V6 engine received an electronic throttle body and an EGR system for improved emissions compliance, marking a change from the previous cable-driven throttle with a separate IAC valve.
• 2008-2011: The optional 4.7L V8 engine was significantly revised for 2008, with power increasing to 302 hp and 329 lb-ft of torque. It also became E85 Flex Fuel compatible and was paired with a five-speed automatic transmission.
• 2005-2007: Models with the 3.7L V6 or standard-output 4.7L V8 had an available six-speed manual transmission, an option that was deleted for V8 models after 2006.

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

• P0171 — System Too Lean (Bank 1) - Frequently accompanies P0507 on the 3.7L/4.7L engines because the cracked rear PCV elbow introduces unmetered air (a vacuum leak) into the intake manifold.
• P0174 — System Too Lean (Bank 2) - Similar to P0171, this lean code is often triggered alongside P0507 due to the massive vacuum leak caused by a collapsed or broken PCV hose.
• P0506 — Idle Air Control System RPM Lower Than Expected - The inverse of P0507. It shares the same root causes, such as a severely carbon-fouled throttle body or a sticking IAC valve on 2005-2007 models.
• P2111 — Throttle Actuator Control System - Stuck Open - On 2008+ Electronic Throttle Body (ETB) models, heavy carbon buildup from the PCV system can cause the throttle plate to stick, triggering this code alongside a high idle.
• P0300 — Random/Multiple Cylinder Misfire Detected - A severe vacuum leak from the rear intake manifold elbow can lean out the air/fuel mixture enough to cause random misfires at idle.

Frequently Asked Questions