P0107 on 2017-2021 Chrysler Pacifica: MAP Sensor Circuit Low Causes and Fixes

What's Unique About the 2017-2021 Chrysler Pacifica

The 3.6L Pentastar V6 in the Pacifica is a widely used engine across the Chrysler, Dodge, and Jeep lineup. For this platform, a P0107 code is very commonly traced back to a faulty MAP sensor that is simple to replace. The sensor is located conveniently on the upper intake manifold, making it a 15-minute DIY job for most owners. A key diagnostic point for Chrysler vehicles is that the MAP sensor may share its 5-volt reference power with other sensors; a short in an unrelated sensor can sometimes trigger a P0107 code, even if the MAP sensor itself is good. Furthermore, the Pentastar's PCV system is known to sometimes vent oil vapor into the intake, which can foul the MAP sensor and cause repeat failures.

Symptoms You May Notice

• Check Engine Light illuminated
• Rough or unstable idle
• Engine stalling, especially when stopped
• Hesitation or stumbling during acceleration
• Noticeable loss of engine power
• Decreased fuel economy
• Difficulty starting the engine
• Black smoke from the exhaust

Most Likely Causes

1. Faulty Manifold Absolute Pressure (MAP) Sensor 🔴 High Probability → Shop Manifold Absolute Pressure Sensor The sensor is exposed to constant heat and vibration. A known issue on the 3.6L Pentastar is oil contamination from the PCV system, which can foul the sensor's element, leading to failure.
   How to confirm: After confirming the wiring is intact and has proper voltage/ground, the sensor is the remaining point of failure. Inspect the old sensor for oil residue upon removal. Replacing it with a known-good part will resolve the code.
   Typical fix: Replace the MAP sensor. It is a twist-in sensor located on the intake manifold.
   Est. part cost: $20-$65
2. Wiring or Connector Issue 🟡 Medium Probability The wiring harness in the engine bay is susceptible to heat damage, and the connector pins can corrode or become loose. On some platform mates, the harness has been known to chafe on nearby A/C lines, causing a short-to-ground.
   How to confirm: Visually inspect the harness for damage. With the key on, disconnect the sensor and use a multimeter to check for a 5-volt reference and a good ground at the connector. Perform a 'wiggle test' on the harness while monitoring sensor data to see if the voltage fluctuates.
   Typical fix: Repair the damaged section of wire or replace the connector pigtail.
   Est. part cost: $10-$30
3. Vacuum Leak ⚪ Low Probability While possible, a vacuum leak is more likely to cause a P0106 (performance) code. However, a very large leak from a disconnected hose could potentially contribute to out-of-range readings.
   How to confirm: Inspect all vacuum hoses connected to the intake manifold for cracks or disconnection. Listen for a hissing sound at idle. A smoke test is the most definitive way to find a leak.
   Typical fix: Replace the cracked or broken vacuum hose or intake gasket.
   Est. part cost: $5-$50

Rare But Worth Checking

• Failed Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This is very rare. The PCM should only be considered after the sensor, wiring, and 5V reference circuit have been thoroughly tested and proven to be good.
• Shorted 5-Volt Reference Circuit: On Chrysler vehicles, other sensors can share the same 5V power supply as the MAP sensor. A short circuit in another sensor (e.g., oil pressure sensor, A/C pressure sensor) can pull the entire circuit's voltage down, falsely implicating the MAP sensor. There are documented cases on this powertrain of a failed oil pressure sensor causing a P0107 code. If the 5V reference is missing at the MAP connector, unplugging other sensors one by one may reveal the true culprit.

Diagnosis Steps

1. Connect an OBD-II scanner to confirm the P0107 code and check for any other codes.
2. Remove the plastic engine cover (often just pulls off) to access the MAP sensor on the top rear of the intake manifold.
3. Visually inspect the MAP sensor, its electrical connector, and the surrounding wires for any obvious signs of damage, melting, chafing, or corrosion.
4. Disconnect the MAP sensor. Turn the ignition to the 'ON' position (engine off).
5. Use a multimeter to test the electrical connector. Verify you have a 5-volt reference on one pin and a good ground on another. The third pin is the signal wire.
6. If the 5-volt reference is missing, suspect a wiring problem or a shorted sensor on the shared circuit. Begin unplugging other sensors (like the oil pressure sensor) one at a time to see if the 5V returns.
7. If power and ground are good, check for a short. Set the multimeter to Ohms and check for continuity between the signal wire pin and a good chassis ground. The reading should be infinite (open circuit). Any continuity indicates a short to ground in the signal wire.
8. If the wiring checks out perfectly, the MAP sensor itself is almost certainly the cause of the fault.
9. To replace, slide the red locking tab on the connector back, unplug it, then twist the old sensor 90 degrees counter-clockwise and pull it out. Inspect the sensor port for oil residue.
10. Install the new sensor by pushing it in and twisting 90 degrees clockwise to lock it. Reconnect the electrical connector and slide the red tab to lock it.
11. Clear the code with the scanner, start the engine, and perform a test drive to ensure the code does not return.

Parts You'll Likely Need

• Manifold Absolute Pressure (MAP) Sensor (OEM #05149174AB (may be superseded by 68371847AB)) — This sensor is the most common failure point for a P0107 code on the 3.6L Pentastar engine.
  Trusted brands: Mopar, Delphi, NGK/NTK, Standard Motor Products
  OEM price range: $55-$70
  Aftermarket price range: $20-$45

Related Codes That Often Appear With This One

• P0106 — Indicates a MAP sensor performance issue. Seeing P0106 and P0107 together often points towards an intermittent wiring problem or a failing, oil-fouled sensor.
• P0108 — This is the opposite code, 'Circuit High Input'. Seeing both P0107 and P0108 can indicate a short between wires in the harness or an intermittent sensor failure.
• P0172 — Indicates 'System Too Rich'. The PCM may default to a rich fuel mixture as a protective measure when it receives an invalid (too low) signal from the MAP sensor.

Technical Service Bulletins (TSBs) & Recalls

• NHTSA Recall 19V348: Addresses potential engine stalling on 2017-2019 Pacificas due to an improperly installed wiring harness, which could cause symptoms similar to a MAP sensor failure.
• NHTSA Recall U01: Pertains to 2017 Pacifica models and involves a PCM software update to prevent an engine stall that could result from the software losing sync with the crankshaft position sensor.

Platform-Specific Known Issues

• A known issue on the 3.6L Pentastar is oil fouling of the MAP sensor due to the PCV system design. If you are replacing the sensor for a second time, consider inspecting the PCV valve and potentially installing an oil catch can.
• Always check the 5V reference circuit. A shorted oil pressure sensor has been documented on platform-mate vehicles to cause a P0107 code, leading to a misdiagnosis of a bad MAP sensor.

Mechanic-Grade Diagnostic Values

• MAP Sensor Signal Voltage (Key On, Engine Off) — expected: ~4.5V - 5.0V DC. Failure: Voltage is significantly lower. A reading below 0.5V for more than a few seconds triggers P0107.
• MAP Sensor Signal Voltage (Engine at Idle) — expected: ~1.0V - 1.8V DC. Failure: Voltage remains high (near KOEO reading) or is stuck below 0.5V.
• MAP Sensor 5V Reference Wire (at connector, unplugged) — expected: 4.8V - 5.2V DC. Failure: Voltage is below 4.5V or is 0V, indicating a problem with the PCM, the supply wire, or a short on the shared reference circuit.
• MAP Sensor Ground Circuit (at connector, unplugged) — expected: < 1.0 Ohm resistance to chassis ground. Failure: Resistance is higher than 1.0 Ohm, indicating a poor ground connection.
• Voltage Drop Test (Sensor Ground Circuit K900) — expected: < 0.5V. Failure: A voltage reading above 0.5V indicates excessive resistance in the ground circuit between the sensor and the PCM.

Scan Tool Commands That Help

• Professional Scan Tool (e.g., wiTECH, Autel): Jumper 5V Reference to Signal Circuit — After confirming good 5V power and ground at the MAP connector, unplug the sensor and use a jumper wire between the 5V reference and signal wire terminals. The scan tool's live data for MAP voltage should jump to 5V. If it does, the wiring to the PCM is good and the sensor is faulty. If it does not, there is an open or short in the signal wire.
• Professional Scan Tool (e.g., wiTECH, Autel): Live Data Graphing & Wiggle Test — To diagnose an intermittent fault, graph the MAP sensor voltage while physically wiggling the sensor connector and its wiring harness. Any sharp drops or spikes in the voltage graph during the wiggle test indicate a wiring or connector issue that needs repair.

Wiring & Ground Locations

• MAP Sensor Connector (3-wire) — On the MAP sensor itself, located on the top, rear of the intake manifold.. This is the primary connection point to test for 5V reference, ground, and the signal wire. The pins are: (K856) 5 Volt Supply, (K900) Sensor Ground, and (K1) MAP Signal.
• (K856) 5 Volt Supply — Wire running from the PCM to the MAP sensor connector.. An open or short on this wire will starve the sensor of power, causing a P0107. This circuit may be shared with other sensors; a short elsewhere can pull this voltage down.
• (K1) MAP Signal — Wire running from the MAP sensor connector to the PCM.. This wire carries the variable voltage signal back to the computer. A short to ground on this wire is a direct cause of a P0107 code.
• (K900) Sensor Ground — Wire running from the MAP sensor connector to the PCM, providing a ground reference.. High resistance or an open on this wire can cause incorrect voltage readings, though it more commonly leads to a P0108 (Circuit High) code.

Real Owner Repair Stories

• Backroads DIY / YouTube (2021 Chrysler Pacifica) — Rough idle, 'Service Electronic Throttle Control' and 'Service Electronic Stability Control' messages on the dash, and a P0108 (Circuit High) code.
  ❌ Tried (didn't work) Cleaning the Intake Air Temperature (IAT) sensor., Cleaning the Manifold Absolute Pressure (MAP) sensor.
  ✅ What actually fixed it Replacing the Manifold Absolute Pressure (MAP) sensor resolved the symptoms and codes. This demonstrates that even on a newer model, sensor failure is common and cleaning is not always an effective fix.

OEM Part Supersession History

• 05149174AB → 68371847AB — Standard part number update/revision by the manufacturer.

Model Year Variations Within This Range

• 2021: The 2021 model year received a significant facelift and the option for All-Wheel-Drive (AWD). However, the 3.6L Pentastar V6 engine remained the standard powertrain, and the location and replacement procedure for the MAP sensor are identical to earlier years in the range.

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 🔴 High — Very common, typically occurs after 60,000 miles. The plastic housing becomes brittle from heat cycles and can lead to a sudden, major loss of engine oil or coolant.
• Engine Stalling 🔴 High — Subject to multiple recalls. Can be caused by faulty software or wiring issues, leading to unexpected engine shutdown while driving. (Ref: NHTSA Recalls: 19V348 (wiring harness) and U01 (PCM software update for 2017 models).)
• Harsh Shifting / Clunking (9-Speed Auto) 🟠 Medium — Common complaint of rough or delayed shifts, particularly at low speeds. Often feels like a major mechanical failure but is frequently software-related. (Ref: TSB 21-006-21 involves a Transmission Control Module (TCM) software flash to correct the shifting logic.)
• ESS / Auto Start-Stop System Failure 🟡 Low — Extremely common. Presents as a 'Stop/Start Unavailable' message on the dash. Almost always caused by the failure of the small auxiliary battery, which has a shorter lifespan than the main battery.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific repair, buying a used MAP sensor is generally not recommended. The part is electronic and relatively inexpensive to buy new from aftermarket sources ($20-$45). The risk of a used part failing shortly after installation outweighs the small cost savings.

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

What to inspect on the donor part:

• Ensure the plastic housing has no cracks or signs of heat damage.
• Inspect the electrical connector pins to ensure they are straight and free of corrosion.
• Look into the sensor port; avoid any sensor that is heavily coated in oil residue, as it may be near failure.

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

• For this P0107 repair, no parts are considered 'OEM-only'. Quality aftermarket sensors are widely available and perform well.

Aftermarket brands forum-validated for this vehicle:

• Delphi
• NGK/NTK
• Standard Motor Products (SMP)

Real Owner Stories

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

Related OBD-II Codes

• P0106 — A performance-range code for the MAP sensor that often appears on the 3.6L Pentastar due to sensor failure or vacuum leaks.
• P0108 — The high-input counterpart to P0107; frequently shared by platform mates like the Grand Caravan when the MAP sensor fails.
• U01 — A recall-related software code for 2017 models that involves engine stalling symptoms similar to those caused by a faulty MAP sensor.

Frequently Asked Questions