P0452 on 2008-2020 Dodge Grand Caravan: EVAP Pressure Sensor Low Input Causes and Fixes

What's Unique About the 2008-2020 Dodge Grand Caravan

On the Dodge Grand Caravan, the single most important factor for this code is the location of the Fuel Tank Pressure (FTP) sensor. It is mounted on the fuel pump module, which sits on top of the fuel tank. This design means that replacing what is often a simple, inexpensive sensor becomes a significant repair job, as the entire fuel tank must be lowered to gain access. This dramatically increases the labor cost and DIY difficulty compared to vehicles where the sensor is more accessible, such as in the wheel well.

Symptoms You May Notice

• Check Engine Light is on
• Possible faint fuel smell (less common)
• Vehicle will fail an emissions/smog test
• Remote start may be disabled

Most Likely Causes

1. Faulty Fuel Tank Pressure (FTP) Sensor 🔴 High Probability The sensor is a common failure item due to age and constant exposure to fuel vapors. Since it's an electronic component, internal failure (short circuit) can cause the signal voltage to drop to zero, triggering the P0452 code.
   How to confirm: After confirming the wiring is intact, this is the most likely component failure. A scan tool showing FTP sensor voltage near 0V is a strong indicator. With the gas cap off, a healthy sensor should read around 2.5 volts. Due to the sensor's location on top of the fuel tank, diagnosis often proceeds by elimination before committing to dropping the tank. A definitive wiring test involves jumping the 5V reference wire to the signal wire at the harness connector; a scan tool should then show a reading near 5V, confirming the wiring integrity to the PCM. 🎬 Watch: A professional guide to diagnosing the P0452 code
   Typical fix: Replace the Fuel Tank Pressure sensor. This requires partially or fully dropping the fuel tank to access the top of the fuel pump module where the sensor is located. It is highly recommended to do this when the fuel tank is as empty as possible. 🎬 Watch: How to safely drain and remove the fuel tank
   Est. part cost: $40 - $130
2. Wiring Harness or Connector Issue 🟡 Medium Probability The wiring runs along the chassis to the fuel tank and can be susceptible to damage from road debris, corrosion (especially in rust-belt states), or rodent damage. A short to ground on the signal wire or an open/short in the 5V reference or ground wire will cause this code.
   How to confirm: Using a multimeter, back-probe the sensor's 3-pin connector. With the key on, engine off, you should find a 5-volt reference wire, a ground wire (close to 0 ohms resistance to chassis ground), and a signal wire. A lack of 5V or a bad ground points to a wiring issue between the PCM and the sensor.
   Typical fix: Repair the damaged section of the wiring harness or clean/replace the corroded connector. Trace the affected wire back to the PCM if necessary.
   Est. part cost: $5 - $50

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is very rare. Before condemning the PCM, all other possibilities (sensor and wiring) must be exhaustively ruled out. A forum post for an older 2007 Grand Caravan had the code return after a shop replaced the pressure sensor, highlighting the need to check wiring or consider a PCM issue if a new sensor doesn't fix the problem.

Diagnosis Steps

1. Verify the code with an OBD-II scanner. Confirm P0452 is the primary code. Check live data for the FTP sensor voltage; a reading near 0V is a key symptom.
2. Perform a visual inspection of the wiring harness leading to the fuel tank. Look for any obvious signs of damage, corrosion, or breaks. Pay close attention to areas where the harness might rub against the chassis.
3. If accessible, disconnect the FTP sensor connector. Using a multimeter with the key on, engine off, verify the 5-volt reference and a good ground at the connector.
4. If 5V and ground are present, the issue is almost certainly the sensor itself. If they are not present, the wiring harness between the PCM and the sensor is faulty and needs to be traced and repaired.
5. Due to the sensor's location, most technicians will verify the wiring as much as possible before proceeding with the most probable fix: replacing the sensor.
6. To replace the sensor, run the fuel tank to nearly empty. Safely lift the vehicle, support the fuel tank with a transmission jack, and carefully lower it enough to access the top. Disconnect the old sensor from the fuel pump module and install the new one.
🎬 See this walkthrough on testing and replacing the sensor
7. Re-install the fuel tank, reconnect all lines and electrical connectors, and clear the code with a scanner. Perform a complete drive cycle to ensure the code does not return.

Parts You'll Likely Need

• Fuel Tank Pressure Sensor (OEM #Mopar 4593949AB (superseded by 68525698AA)) — This sensor is the most common point of failure for a P0452 code. It fails internally, causing the low voltage signal.
  Trusted brands: Mopar, Bosch, Duralast, Standard Motor Products
  OEM price range: $60-$90
  Aftermarket price range: $25-$80

Technical Service Bulletins (TSBs) & Recalls

• TSB #SB-1800309 (June 11, 2009): For some 2008-2009 models, including the Grand Caravan, this bulletin addresses a P0452 code ('EVAP Pressure Switch Stuck Closed') by recommending a PCM software update. This is considered a less common fix than sensor replacement.
• Manufacturer TSB Bulletin #14-003-25 (Dodge Durango reference): Notes that the check engine light may illuminate specifically after long idle times when P0452 (EVAP Pressure Switch Stuck Closed) is set.
• Manufacturer TSB Bulletin #1807422 (Dodge Challenger reference): Highlights that P0452 can often be found in conjunction with other EVAP codes such as P0455, P0440, and P0456.

Platform-Specific Known Issues

• The primary vehicle-specific issue is the labor-intensive process of dropping the fuel tank to replace the sensor, which turns a simple part swap into a multi-hour job.
• Corrosion of the wiring harness leading to the tank is more common in states that use road salt in the winter.
• A broken engine-to-chassis ground strap can cause various intermittent electrical issues, and while not a direct cause of P0452, ensuring it is intact is good practice on these vans.

Mechanic-Grade Diagnostic Values

• FTP Sensor Signal Voltage (Key On, Engine Off, Gas Cap Off) — expected: ~2.5 Volts. Failure: A reading consistently below 0.5V, often near 0V, indicates a fault.
• FTP Sensor 5V Reference at Connector — expected: 5.0 Volts. Failure: No voltage indicates an open in the reference wire from the PCM or a PCM fault.
• FTP Sensor Ground Wire Resistance to Chassis — expected: Less than 1.0 Ohm. Failure: High resistance indicates a bad ground connection, which can cause incorrect sensor readings.
• FTP Sensor Signal Voltage (applying light vacuum) — expected: Voltage should decrease from ~2.5V towards ~1.5V.. Failure: Voltage does not change, indicating a stuck sensor.

Scan Tool Commands That Help

• wiTECH or equivalent professional scanner: EVAP System Leak Test — While primarily for leak codes, running this test allows a technician to monitor the FTP sensor's voltage response to pressure changes commanded by the scan tool, helping to confirm if the sensor is stuck at a low reading and not responding.
• wiTECH or equivalent professional scanner: EVAP Active Test / View PIDs — To view all relevant EVAP system data points (sensor voltage, purge command, vent solenoid status) on one screen to analyze system behavior during diagnosis.

Wiring & Ground Locations

• FTP Sensor Connector — On top of the fuel pump module, which is on top of the fuel tank.. This is the 3-pin connector where voltage and ground tests must be performed to distinguish a sensor failure from a wiring failure before dropping the fuel tank.
• G102 — Under the battery tray in the engine compartment.. This is a major chassis ground point. While not the direct ground for the FTP sensor, poor connections here can cause widespread electrical issues that could mimic sensor problems.
• Engine Ground Strap (Part # 4685816AA) — Jumps from the engine block across a motor mount to the vehicle frame, near the accessory belt.. These straps are known to break on Grand Caravans. A broken strap can cause intermittent and strange electrical behavior as modules hunt for a ground path. Checking its integrity is a wise step when diagnosing any electrical fault on this platform.

Real Owner Repair Stories

• DodgeForum.com user 'daddydukes' (2007 Dodge Grand Caravan) — Check Engine Light with code P0452.
  ❌ Tried (didn't work) Replacing the gas cap., Paying a shop to replace the fuel tank pressure sensor.
  ✅ What actually fixed it The user reported the code came back 50 miles after the sensor was replaced. A senior forum member ('master tech') provided the official diagnostic flowchart, pointing towards a next step of checking the wiring harness for a short to ground or an issue with the PCM, as the new part did not resolve the issue.
• NHTSA ODI #11309587 (Dodge Dart reference): An owner reported that the engine stalls while driving after a fuel fill-up, noting that the P0452 code remains active until the fuel level drops to about 3/4 of a tank, at which point the code becomes stored.

OEM Part Supersession History

• 4593949AA, 4593949AB → 68525698AA — Standard part revision and consolidation by Mopar.
  Heads up: The new part number 68525698AA is the correct and current replacement for the older numbers across the specified model years.

Model Year Variations Within This Range

• 2008-2010: These years used the 3.3L, 3.8L, and 4.0L V6 engines. The fundamental EVAP system design and P0452 cause remain the same, but wiring diagrams and PCM connector pinouts may differ slightly from the later Pentastar models.
• 2011-2020: These years exclusively used the 3.6L Pentastar V6 and a 6-speed automatic transmission. While the cause of P0452 is identical, service information specific to the Pentastar engine should be used.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Cracked Oil Filter/Cooler Housing (3.6L Pentastar) 🔴 High — Very common, often occurs after 60,000 miles. The plastic housing cracks from heat cycles, causing significant oil leaks onto the top of the engine and transmission.
• Faulty Totally Integrated Power Module (TIPM) 🔴 High — Common across many 2007-2014 Chrysler/Dodge vehicles. Can cause a wide range of bizarre electrical issues like no-start, fuel pump staying on, horn honking randomly, and wipers activating on their own.
• 62TE Transmission Shudder / Harsh Shifting 🟠 Medium — A frequent complaint. Can manifest as harsh shifts, shuddering, or delayed engagement. Causes range from low/old fluid to failing solenoid packs or internal compounder issues. (Ref: Software updates from dealers sometimes improve shift quality.)
• Premature Brake Wear 🟠 Medium — Owners frequently report needing to replace pads and rotors more often than expected, particularly on pre-2013 models with smaller brakes.
• Sliding Door Lock Actuator / Wiring Failure 🟡 Low — Common issue where the power sliding doors fail to lock/unlock, often accompanied by a buzzing noise from a failed actuator. The wiring harness that flexes with the door can also break over time.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used wiring harness pigtail from a junkyard is an excellent, cost-effective choice if your original sensor connector is damaged or corroded. A full harness section can also be sourced used if a specific chafe point is identified.

Donor-vehicle mileage cap: roughly under 150000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For wiring: Check for flexible, non-brittle insulation.
• For connectors: Ensure locking tabs are intact and pins are free of green or white corrosion.
• Verify the donor vehicle is from a dry, non-rust-belt state if possible to minimize corrosion risk.

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

• Fuel Tank Pressure Sensor: Given the significant labor required to drop the fuel tank for access, using a cheap, unproven aftermarket sensor is a major risk. A premature failure would require repeating the entire job. Stick with Mopar or a top-tier OEM-equivalent brand.

Aftermarket brands forum-validated for this vehicle:

• Bosch
• Standard Motor Products (SMP)
• NTK

Brands owners have reported issues with on this vehicle:

• No-name, unbranded sensors from online marketplaces. The potential for early failure outweighs the small cost savings.

Real Owner Stories

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

Related OBD-II Codes

• P0453 — Direct counterpart to P0452 (Circuit High). It's often caused by the same components—the FTP sensor or its wiring—but with a different failure mode, such as an open circuit or a short to power instead of a short to ground.
• P0451 — Indicates the FTP sensor's signal is erratic or out of its expected range. This can be a precursor to a complete failure that sets P0452, often pointing to an intermittent wiring connection or an internally failing sensor.
• P0450 — A general malfunction code for the EVAP Pressure Sensor circuit. Since the TSB for P0452 specifically refers to a 'Pressure Switch' fault, this general code is highly related to the same component.
• P0455 — EVAP System Gross Leak Detected. While P0452 is an electrical fault, P0455 is for the same system. A faulty FTP sensor could potentially be misread by the PCM, or a vehicle could have both an electrical and a physical leak issue simultaneously.
• P0456 — EVAP System Small Leak Detected. Like P0455, this code is for the same system but indicates a much smaller physical leak. It's important to distinguish this from the specific sensor circuit failure of P0452 during diagnosis.

Frequently Asked Questions