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P0325 on 2011-2017 Chrysler 200 2.4L: Knock Sensor Circuit Malfunction Causes and Fixes

For a Chrysler 200 with a 2.4L engine, P0325 typically means the knock sensor has failed or its wiring is damaged. The sensor is often located under the intake or exhaust manifold, making replacement labor-intensive. On 2015-2017 models with the Tigershark engine, it is located under the exhaust manifold. Expect to pay $30-$80 for an aftermarket sensor and several hundred dollars in labor if a shop performs the work.

20 minutes to read 2011-2017 Chrysler 200

Most Likely Cause

Faulty Knock Sensor

Difficulty

4/5

Est. Time

3.5 hrs

DIY Doable?

🔧 Shop

Shop Labor

300 – 700

Parts Price

30 – 140

⚠️ Drivable, but... — You can drive the vehicle, but the PCM will default to a 'safe' ignition timing map, resulting in reduced engine performance and poor fuel economy. Ignoring the code long-term leaves the engine unprotected from potentially damaging knock, which could lead to serious internal engine damage.

Key Takeaways

P0325 on a 2.4L Chrysler 200 points to a fault in the knock sensor circuit, most commonly a failed sensor or damaged wiring.
The location of the sensor varies by model year; on 2015-2017 Tigershark engines, it is under the intake manifold, making replacement a difficult and labor-intensive job.
Due to the high labor involved, it is wise to replace the sensor's wiring pigtail and the intake manifold gaskets at the same time you replace the sensor.
Driving with this code will cause reduced performance and fuel economy, and it leaves the engine vulnerable to damage if a real knock condition occurs.

The trouble code P0325 stands for "Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)". The knock sensor is a small piezoelectric microphone bolted to the engine block that listens for vibrations from engine knock (also called detonation or pinging). The Powertrain Control Module (PCM) uses this signal to adjust ignition timing for optimal performance and to prevent engine damage. This code means the PCM has detected a problem in the knock sensor's electrical circuit—such as a signal that is missing or outside the expected voltage range—and can no longer rely on its signal.

What's Unique About the 2011-2017 Chrysler 200

The 2011-2017 Chrysler 200 spans two generations with different 2.4L engines and knock sensor locations. The 2011-2014 models (JS generation) use the 2.4L World Engine, where the sensor is typically under the intake manifold. The 2015-2017 models (UF generation) use the 2.4L Tigershark engine, where the sensor is located on the front of the engine block, under the exhaust manifold. This location difference significantly impacts the difficulty and labor time for replacement. On the Tigershark, accessing the sensor requires removing the exhaust manifold heat shield and sometimes the manifold itself, making it a labor-intensive job.

Generation note: The 2011-2017 range covers two generations of the Chrysler 200. The first generation (2011-2014) used the 2.4L World Engine, while the second generation (2015-2017) used the 2.4L Tigershark I4. The knock sensor location differs between them: under the intake manifold for the earlier models and under the exhaust manifold for the later Tigershark engine, which affects repair difficulty.

Symptoms You May Notice

Check Engine Light is on
Reduced engine power and sluggish acceleration
Decreased fuel economy
Engine hesitation or jerking
Audible engine knocking or pinging noises (in some cases)

⚠️ Don't Waste Money on the Wrong Fix

Replacing the knock sensor without inspecting the wiring harness. The connector pigtail is a common failure point and can cause the code to return if not addressed.
Replacing spark plugs or ignition coils to fix performance issues without addressing the P0325 code first. The poor performance is often a result of the PCM's safe mode, not the cause of the code.

Most Likely Causes

Faulty Knock Sensor 🔴 High Probability The sensor is located in a high-heat, high-vibration environment on the engine block, which leads to eventual failure of its internal piezoelectric components or cracks in its housing.
How to confirm: After verifying the wiring is intact, test the sensor's resistance with a multimeter and compare it to the manufacturer's specifications. A reading of open circuit (infinite resistance) or a dead short confirms a bad sensor. A 'tap test' with a scan tool monitoring the signal can also be effective.
Typical fix: Replace the knock sensor. It is highly recommended to also replace the wiring pigtail connector at the same time, as it is also prone to heat damage and brittleness.
Est. part cost: $25-$80
Damaged Wiring or Connector 🟡 Medium Probability The wiring harness is routed in a high-heat area near the engine block and manifolds. Over time, the heat can make the wiring brittle, causing it to crack, chafe, or melt, resulting in a short or open circuit. Damage can also occur during unrelated repairs in the same tight area, such as a starter replacement.
How to confirm: Visually inspect the wiring harness leading to the knock sensor for any signs of damage, melting, or corrosion. Perform a continuity test from the sensor connector to the PCM connector to check for breaks in the wire.
Typical fix: Repair the damaged section of the wire or replace the connector pigtail. If damage is extensive, a new engine wiring harness section may be required.
Est. part cost: $15-$40

Rare But Worth Checking

PCM Software Update Needed: In some cases across various manufacturers, a P0325 code can be triggered by a software glitch. It is worth checking for any available Technical Service Bulletins (TSBs) related to PCM updates if the sensor and wiring test good.
Internal Engine Problems: If the engine is truly knocking due to other issues (like excessive carbon buildup or low oil pressure on Tigershark engines known for oil consumption), the sensor may be working correctly. This would typically be accompanied by other symptoms and possibly other trouble codes.
Faulty Powertrain Control Module (PCM): This is a very rare cause. The PCM should only be considered as the culprit after all other possibilities, including the sensor and its entire circuit, have been exhaustively tested and ruled out.

Diagnosis Steps

Use an OBD-II scanner to confirm the P0325 code and check for any other related codes.
Inspect the engine for any obvious mechanical issues or audible knocking sounds.
Visually inspect the knock sensor's wiring harness and connector for any signs of damage, melting, chafing, or corrosion. This is a critical step, especially on the Tigershark engine where the harness is near the hot exhaust manifold.
If the wiring appears intact, disconnect the sensor and test its internal resistance using a digital multimeter. Compare the reading to the manufacturer's specification (typically high resistance, e.g., 90-110 kOhms, but refer to service manual). An open or shorted reading indicates a failed sensor.
Perform a continuity test on the wiring between the sensor connector and the PCM connector to rule out an open or short circuit.
If the sensor and wiring test good, check for any available PCM software updates from Chrysler.
If all other tests pass, the knock sensor itself is the most likely culprit.

Parts You'll Likely Need

Ignition Knock Sensor (OEM #5033316AB) — This is the most common component to fail, triggering the P0325 code due to internal failure from heat and vibration. The OEM part number 5033316AB supersedes previous versions like 5033316AA and 56028563AA.
Trusted brands: Mopar, Delphi, NGK/NTK, Standard Motor Products (SMP)
OEM price range: $90-$140
Aftermarket price range: $25-$80
Knock Sensor Connector Pigtail — The connector becomes brittle from engine heat and can cause a poor connection, mimicking a failed sensor. It is often replaced as a preventative measure during a knock sensor job.
Trusted brands: Dorman, Standard Motor Products (SMP)
OEM price range: $20-$40
Aftermarket price range: $15-$30
Intake Manifold Gaskets — If the sensor is located under the intake manifold (common on the 2011-2014 2.4L World Engine), the manifold must be removed for access. The gaskets are single-use and must be replaced to prevent vacuum leaks.
Trusted brands: Mopar, Fel-Pro, Mahle
OEM price range: $25-$50
Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

P0326 — This code for 'Knock Sensor 1 Circuit Range/Performance' is very closely related and often points to the same root causes, such as a failing sensor or an intermittent wiring connection.
P0327 — This code indicates 'Knock Sensor 1 Circuit Low Input'. It points specifically to an electrical issue like a short to ground in the sensor's circuit, which could appear alongside P0325.
P0328 — This code indicates 'Knock Sensor 1 Circuit High Input'. It points to an electrical issue like an open circuit or a short to voltage, which could appear with P0325.

Technical Service Bulletins (TSBs) & Recalls

TSB 09-003-23 REV A: Addresses the excessive oil consumption issue on the 2.4L Tigershark engine and outlines the oil consumption test procedure for warranty claims under the XB1 warranty extension.
TSB 18-023-16 REV. C: A PCM software update for the 2.4L Tigershark that, while primarily for other codes, can improve overall engine diagnostics and performance, which is relevant when troubleshooting complex electrical codes.
Recall S55 / NHTSA 16V-529: Addresses an issue where the 9-speed transmission could unexpectedly shift to neutral due to insufficient crimps in the transmission wire harness. Affects 2015 Chrysler 200 models.

Platform-Specific Known Issues

source — A user on Jeep Cherokee Forum, which shares the same 2.4L engine and layout, reported that a P0325 code appeared immediately after a difficult starter motor replacement. The tight working space makes it very easy to accidentally damage the knock sensor's wiring or connector while maneuvering the starter, leading to an immediate circuit fault code. The user noted the job was 'miserable' due to the tight fit, a common sentiment for that repair.

Mechanic-Grade Diagnostic Values

Knock Sensor Mounting Bolt Torque — expected: 20 N·m (15 ft-lbs). Failure: An improperly torqued sensor (either too loose or too tight) will not transmit knock vibrations to the internal piezoelectric crystal correctly, leading to either no signal or a distorted, unreliable signal.
Knock Sensor Resistance — expected: Very high resistance, often in the 500-600 kOhm range or higher. Some service manuals simply specify checking for continuity.. Failure: A reading of an open circuit (infinite resistance) or a dead short (near zero ohms) indicates a failed sensor.
Knock Sensor Circuit Voltage (at sensor connector, key on) — expected: Approximately 2.5V reference voltage on one pin from the PCM.. Failure: Significantly higher or lower voltage, or 0V, indicates a problem with the wiring or the PCM itself.
PCM Voltage Set Condition for P0325 — expected: The PCM expects a signal within a specific voltage window.. Failure: The code may set if the PCM sees the knock sensor input voltage go above 4.8 volts or below 0.2 volts while the engine speed is above 2000 RPM.

Wiring & Ground Locations

Knock Sensor PCM Pins (Tigershark) — At the Powertrain Control Module (PCM) C2 connector.. For end-to-end circuit testing, you need to know the specific pins. The knock sensor signal is on Pin 31 (Dark Green/Dark Blue wire) and the sensor ground return is on Pin 13 (Dark Blue/Dark Green wire). This allows for continuity and short-to-ground tests directly from the PCM connector.
Main Engine Ground Strap — Typically located on the passenger side of the engine bay, connecting the engine block or bracket to the chassis frame rail.. While the knock sensor has a dedicated ground wire back to the PCM, a poor main engine ground can introduce electrical noise into the entire system. This noise can interfere with the low-voltage signal from the knock sensor, potentially causing false readings or triggering circuit malfunction codes.

Real Owner Repair Stories

Dodge-Dart.org forum user (Dodge Dart with 2.4L Tigershark engine (shared platform)) — Persistent P0325 code after multiple checks.
❌ Tried (didn't work) Replacing the knock sensor, Verifying wiring integrity between sensor and PCM
✅ What actually fixed it The final solution was a PCM software update. A Technical Service Bulletin for unrelated issues included a reflash that, as a side effect, corrected the logic for the knock sensor monitoring and resolved the false P0325 code.
Various online forums (Chrysler 200 / Dodge Dart / Jeep Cherokee with 2.4L Tigershark) — P0325 code returned shortly after repair.
❌ Tried (didn't work) Replacing the original knock sensor with a cheap, unbranded sensor from an online marketplace (e.g., Amazon, eBay).
✅ What actually fixed it The code was permanently resolved only after replacing the cheap aftermarket sensor with a high-quality one from a known OEM supplier like Mopar, NGK/NTK, or Delphi.

OEM Part Supersession History

56028563AA, 5033316AA → 5033316AB — Standard part evolution for improved reliability, material composition, or manufacturing process.
Heads up: The newer part number 5033316AB is backward compatible and the recommended replacement for all previous versions.

Model Year Variations Within This Range

2011-2014: These models use the 2.4L World Engine. The knock sensor is typically located under the intake manifold, requiring its removal for access. The intake manifold gaskets must be replaced during this procedure.
2015-2017: These models use the 2.4L Tigershark I4 engine. The knock sensor is located on the front of the engine block, under the exhaust manifold. Access requires removing the exhaust heat shield and is considered more labor-intensive by some technicians than the intake manifold removal on the earlier engine.

Diagnostic Flowchart

Start by confirming if P0325 is the only code present. On the Tigershark engine, this code often points to physical circuit damage or sensor failure due to the high-heat environment near the exhaust manifold.

Inspect the knock sensor wiring near the starter. Is the harness pinched, melted, or disconnected?

→ Repair the damaged wiring or replace the pigtail connector. The tight workspace during starter replacement often leads to accidental harness damage on this platform.

Are there other codes present, specifically P0300 (Misfire) or oil-related warnings?

→ Address misfires first. Mechanical vibrations from a misfire can trigger false knock codes. If oil is low, refer to TSB 09-003-23 REV A regarding excessive oil consumption on the 2.4L Tigershark.

Perform a visual inspection of the knock sensor (located on the engine block under the intake manifold). Is the connector brittle or the wiring harness frayed?

→ Replace the knock sensor pigtail connector ($15-$40). The high-heat environment near the manifold makes these wires brittle and prone to cracking.

Disconnect the sensor and test internal resistance with a multimeter. Does it show an open circuit (infinite) or a dead short?

→ Replace the knock sensor ($25-$80). Internal piezoelectric components often fail due to engine vibration and heat soak on the 2.4L block.

Check the PCM software version. Is the vehicle running the latest calibration?

→ Update the PCM software. Refer to TSB 18-023-16 REV. C; while primarily for other codes, this update improves overall engine diagnostic logic for the Tigershark platform.

→ Perform a 'tap test' while monitoring live data on a scan tool. If the sensor does not respond to physical tapping on the block, replace the sensor despite passing static resistance tests.