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P0106 on 2020-2024 Ford Explorer 3.3L: Causes and Fixes for MAP Sensor Issues

Q: I just bought a 2021 Ford Explorer Police Interceptor and the P0106 code is on. Does TSB SSM 49446 apply to me?

Yes, SSM 49446 specifically addresses the 3.3L Police Interceptor Utility. It notes that P0106 can be triggered by altitude changes during vehicle transport. The recommended first step is to clear the code.

Q: Could a wiring issue be causing the erratic MAP sensor readings on my 2020 Explorer 3.3L?

Yes. A poor connection at the main engine bay ground point (G103) can introduce electrical noise and cause erratic readings. You should also check the 3-pin connector for loose pins or corrosion.

Q: Is there a recall for the 3.3L engine in the Police Interceptor that I should be aware of while fixing this?

While not directly related to the MAP sensor, Recall 24V-598 exists for the 3.3L engine in police use due to potential connecting rod fractures and under-hood fires following frequent wide-open throttle use.

Q: What are the specific voltage specs I should look for when testing the MAP sensor on my 3.3L V6?

With Key On, Engine Off (KOEO), you should see approximately 4.5 Volts (matching BARO). At idle, the voltage should drop to between 1.0-1.8 Volts.

Q: My 2021 Explorer was just delivered from a different state and the Check Engine Light is on for P0106. Is the sensor broken?

Not necessarily. According to SSM 50156, new 2021 models transported to different altitudes can set this code on the first start. If this is the case, the code likely will not return after being cleared.

Q: Can a transmission issue on the 2020+ Explorer mimic engine performance problems like P0106?

The 10R60 transmission is known for harsh or delayed shifting (TSB 23-2176), which owners may notice alongside engine symptoms like hesitation or surging during acceleration.

On a 2020-2024 Ford Explorer, P0106 is most often caused by a faulty Manifold Absolute Pressure (MAP) sensor. Before replacing it, check for vacuum leaks and inspect the wiring. A replacement sensor is typically under $100 for an aftermarket part. If the vehicle is new, the code may be a one-time glitch from altitude changes during transport that can be cleared.

19 minutes to read 2020-2024 Ford Explorer

Most Likely Cause

Faulty Manifold Absolute Pressure (MAP) Sensor

Difficulty

2/5

Est. Time

1 hrs

DIY Doable?

✅ Yes

Shop Labor

$125 – $350

Parts Price

$50 – $150

⚠️ Drivable, but... — You can drive, but you may experience rough idling, poor acceleration, black smoke from the exhaust, and possible stalling, which can be a safety risk in traffic. Continued driving will also result in poor fuel economy and increased emissions.

Key Takeaways

P0106 on a 2020-2024 Explorer points to a problem with the MAP sensor's signal.
The most likely fix is replacing the MAP sensor itself, but always check for vacuum leaks first.
If the vehicle is brand new, the code might be a temporary glitch from being transported to a different altitude; clear the code first.
A faulty vacuum harness between the intake, EGR, and fuel pressure sensor has been identified as a specific fix for this code on Explorers.
If the code appears after a battery disconnect or throttle body cleaning, an idle relearn procedure may be required.

The trouble code P0106 stands for "Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance." This means the engine's main computer, the Powertrain Control Module (PCM), has detected that the signal from the MAP sensor is irrational or outside its expected range when compared to the Barometric Pressure (BARO) sensor. The PCM uses the MAP sensor to measure engine load, which is crucial for calculating the correct air-fuel mixture and ignition timing. When this signal is unreliable, the PCM logs the code and turns on the Check Engine Light.

What's Unique About the 2020-2024 Ford Explorer

For the 2020-2024 Ford Explorer, particularly models with the 3.3L V6 (including Police Interceptors), this code can sometimes be triggered by significant altitude changes during vehicle transport, as noted in Ford TSBs. In these specific cases, the PCM's stored barometric pressure reading from the original location conflicts with the new reading at the next key-on, setting the code without a mechanical fault. Otherwise, the causes are typical for a modern gasoline engine, with the MAP sensor itself being a common point of failure.

Symptoms You May Notice

Check Engine Light is on
Rough or unstable idle
Hesitation or surging during acceleration
Decreased fuel economy
Engine stalling in some cases
Hard starting
Black smoke from the exhaust

⚠️ Don't Waste Money on the Wrong Fix

Replacing the throttle body without checking MAP sensor data or for vacuum leaks.
Replacing oxygen sensors when the incorrect air-fuel mixture is actually caused by a bad MAP reading.

Most Likely Causes

Faulty Manifold Absolute Pressure (MAP) Sensor 🔴 High Probability Sensors can fail over time due to heat cycles and internal component degradation. Carbon and oil buildup from the PCV and EGR systems can also contaminate the sensor element, leading to inaccurate readings.
How to confirm: Use a scan tool to monitor the MAP sensor's live data. With Key On, Engine Off (KOEO), the MAP reading should be nearly identical to the Barometric Pressure (BARO) reading (approx. 4.5 Volts). At idle, the voltage should drop to around 1.0-1.8 Volts and then rise smoothly back toward 4.5V with sharp acceleration.
Typical fix: Replace the MAP sensor. It is typically located on the intake manifold and secured with a single bolt. 🎬 Watch: A quick guide to finding the MAP sensor location.
Est. part cost: $50-$150
Vacuum Leak 🟡 Medium Probability Vacuum hoses (especially PCV lines) and intake gaskets can become brittle and crack over time, leading to unmetered air entering the engine and skewing MAP sensor readings.
How to confirm: Perform a visual inspection of all vacuum lines connected to the intake manifold. A smoke test is the most effective method for finding 🎬 See this quick guide on how to smoke test for leaks. hard-to-see leaks.
Typical fix: Replace the cracked hose or leaking gasket.
Est. part cost: $10-$75
Wiring or Connector Issue ⚪ Low Probability Vibrations and heat can cause wires to break or the connector to become loose or corroded. A poor connection at the main engine bay ground point (G103) can also introduce electrical noise and cause erratic sensor readings.
How to confirm: Visually inspect the MAP sensor's 3-pin electrical connector and wiring harness for damage, corrosion, or loose pins. Use a multimeter to check for the correct reference voltage (usually 5V), a good ground, and a signal wire that changes voltage with vacuum applied.
Typical fix: Repair the damaged wire or clean/replace the connector.
Est. part cost: $5-$50
Altitude Change During Transport ⚪ Low Probability As documented in Ford TSBs SSM 50156 and SSM 49446, new vehicles transported to a different altitude can set this code when first started. This is especially noted for the Police Interceptor Utility.
How to confirm: If the vehicle was recently purchased and delivered from another region, this is a strong possibility. The code will likely not return after being cleared.
Typical fix: Clear the diagnostic trouble code with a scan tool.
Est. part cost: $0

Rare But Worth Checking

Clogged Catalytic Converter: A severely restricted exhaust can increase backpressure, affecting manifold pressure readings. This is usually accompanied by a severe loss of power and potentially other exhaust-related codes.
Dirty Throttle Body: Heavy carbon buildup around the throttle plate can disrupt airflow at idle and low speeds, causing the PCM to see an irrational MAP reading compared to the throttle position. A forum report on a platform-sharing Lincoln Aviator with P0106 required a full throttle body replacement to fix the issue.
Faulty Powertrain Control Module (PCM): This is extremely rare and should only be considered after all other possibilities have been exhaustively ruled out.

Diagnosis Steps

Connect an OBD-II scanner to read the code and check for any other stored codes.
View freeze frame data to see the engine conditions when the code was set.
Use the scanner's live data function to monitor the MAP sensor voltage/pressure. With Key On, Engine Off (KOEO), the MAP reading should be close to the Barometric Pressure (BARO) reading, around 4.5 volts.
Start the engine. At idle, the MAP reading should be low (around 1.0-1.8 volts). Snap the throttle and watch for a smooth and responsive rise in voltage toward 4.5V.
Visually inspect the MAP sensor, its connector, and wiring for any signs of damage, corrosion, or oil contamination.
Inspect all vacuum hoses connected to the intake manifold for cracks, breaks, or loose connections.
If a vacuum leak is suspected, perform a smoke test to pinpoint the source.
If the sensor is suspected, test its circuit. Check for a 🎬 Watch: How to perform professional circuit testing on your MAP sensor. 5-volt reference, a good ground (check continuity to ground G103), and a signal wire that changes voltage with vacuum applied.
If all wiring and vacuum systems are good, the MAP sensor is the most likely culprit.

Parts You'll Likely Need

Manifold Absolute Pressure (MAP) Sensor (OEM #BB5Z-9F479-B (superseded by BB5Z-9F479-C)) — This is the most common component to fail and directly cause a P0106 code.
Trusted brands: Motorcraft, Bosch, NTK, Delphi
OEM price range: $80-$150
Aftermarket price range: $40-$100

Related Codes That Often Appear With This One

P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
P0108: Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0068: MAP/MAF - Throttle Position Correlation

Technical Service Bulletins (TSBs) & Recalls

SSM 50156: Addresses P0106 appearing after vehicle transport due to altitude changes on 2021 models.
SSM 49446: An earlier TSB also addressing the altitude change issue on 2021 models, specifically mentioning the 3.3L Police Interceptor.

Platform-Specific Known Issues

Ford Technical Service Bulletins (TSBs) SSM 50156 and SSM 49446 mention that this code can appear on new vehicles, especially Police Interceptor Utilities, after transport to a different altitude. The first step should be to simply clear the code.

Mechanic-Grade Diagnostic Values

MAP Sensor Signal Voltage (Key On, Engine Off) — expected: ~4.5 V (at sea level, should match BARO reading). Failure: Voltage is significantly different from the BARO sensor reading or is not steady.
MAP Sensor Signal Voltage (Engine at Idle) — expected: 1.0 - 1.8 V. Failure: Voltage remains high, near the KOEO reading, or is erratic.
MAP Sensor 5V Reference Voltage (VREF) — expected: 4.8 - 5.2 V. Failure: Voltage is low or absent, indicating a wiring or PCM issue, not a sensor failure.
MAP Sensor Ground Circuit Voltage — expected: < 0.05 V. Failure: Any significant voltage reading indicates a poor ground connection.

Hidden / Shadow Codes Worth Checking

Mode 6 Data: While not a 'shadow code,' advanced scan tools like FORScan can analyze Mode 6 data to reveal underlying issues like low-level misfire counts that haven't yet triggered a dedicated misfire code but could be contributing to the irrational MAP signal. (see via FORScan or other professional-grade scan tool with Mode 6 capability.)

Scan Tool Commands That Help

Ford IDS / FDRS: Datalogger — Use this function to record live data streams for MAP, BARO, throttle position, and engine RPM during a test drive. This is essential for diagnosing an intermittent P0106 by allowing you to graph the sensor relationships and spot moments where the MAP reading becomes irrational relative to engine load.

Wiring & Ground Locations

G103 — Located on the right-front of the engine compartment, typically on the body structure/fender apron.. This is a primary engine bay ground point. The MAP sensor's reference ground circuit may rely on this point. A loose or corroded G103 can introduce electrical noise, causing erratic and incorrect sensor readings that trigger a P0106.

Real Owner Repair Stories

YouTube user @rjcartutorials (Ford Explorer (year not specified, but relevant body style)) — Persistent P0106 code.
❌ Tried (didn't work) Replacing the EGR valve
✅ What actually fixed it The problem was a faulty vacuum harness. Specifically, the harness that runs from the intake manifold to the EGR valve, with a leg that also connects to the fuel pressure sensor, had failed. Replacing this entire harness resolved the code.
Reddit user reports (Various makes/models, pattern is applicable) — P0106 code appears immediately after maintenance.
❌ Tried (didn't work) Clearing the code, which would sometimes return.
✅ What actually fixed it The code appeared after the battery was disconnected or the throttle body was cleaned. The fix was to perform an idle relearn procedure. This involves letting the vehicle idle uninterrupted for 10-15 minutes for the PCM to recalibrate the new baseline idle airflow and throttle position, which the MAP sensor reading is compared against.

"I Checked Everything" — The Actual Cause

On related Ford EcoBoost engines, a hairline crack in a plastic intake manifold can pass a standard vacuum smoke test, but will leak pressure under boost, causing a P0106. The correct test in this case is to pressurize the intake system and listen for leaks or spray with soapy water.
A faulty vacuum harness with an internal leak or a crack that only opens under specific temperature or vibration conditions may not show up on a simple smoke test but was the ultimate cause of a P0106 in one documented case.

OEM Part Supersession History

BB5Z-9F479-B → BB5Z-9F479-C — Not officially documented, but supersessions typically indicate a revision for improved reliability, material change, or a different supplier to address a known issue.

Model Year Variations Within This Range

2023 vs 2024: The 3.3L V6 hybrid powertrain was available to the general public on trims like the Limited in 2023 but was eliminated as a public option for the 2024 model year, largely being reserved for fleet (Police Interceptor) orders.

Diagnostic Flowchart

Begin by checking for TSB-related altitude issues and verifying live MAP sensor data against Barometric (BARO) pressure to isolate electrical vs. mechanical faults.

Clear the code and test drive. Does P0106 return immediately?

→ Issue resolved. Per Ford SSM 50156 and SSM 49446, altitude changes during transport can trigger false P0106 codes on the 3.3L platform.

Perform KOEO (Key On Engine Off) test. Does MAP voltage match BARO (approx. 4.5V)?

Inspect the 3-pin MAP connector and wiring harness. Any signs of chafing or corrosion?

→ Repair wiring or connector. Note: Check ground point G103 and inspect for harness contact with the A/C pulley as noted in Recall 19S32.

→ Test for 5V reference and ground at the sensor. If circuit is intact but voltage is wrong, replace the MAP sensor ($50-$150).

Start engine. Does MAP voltage drop to 1.0-1.8V at idle and rise smoothly with throttle?

Perform a visual and smoke test on the intake tract. Are there leaks at the PCV lines or intake gaskets?

→ Replace brittle vacuum hoses or leaking intake manifold gaskets ($10-$75). Common on high-cycle 3.3L engines.

Is the vehicle a Police Interceptor Utility with high idle hours or frequent WOT usage?

→ Perform a compression and leak-down test. Per Recall 24V-598, these 3.3L engines are prone to internal mechanical failure/connecting rod issues which can cause erratic manifold pressure.

→ If wiring, vacuum, and altitude are ruled out, replace the MAP sensor. Internal component degradation from heat cycles is the most likely remaining cause.

→ Inspect sensor for oil/carbon contamination from the PCV system. Clean the sensor element with specialized cleaner or replace if fouled.