The cause of the OBDII diagnostic code P006B fault.

What is a P006B fault?

The P006B fault code, applicable to all car manufacturers, means “MAP – Exhaust Pressure Correlation“.

Background Information: The Manifold Absolute Pressure (MAP) sensor measures the pressure (vacuum) in the intake manifold. The Powertrain Control Module (PCM) then uses the difference between the intake manifold pressure and atmospheric pressure (which is linearly related to engine load) as a basis for determining the basic fuel injection quantity to help the engine achieve the optimal air-fuel ratio under different loads. The exhaust pressure sensor transmits the exhaust system pressure to the Electronic Control Unit (ECU) in the form of an electrical signal. This fault code will appear if the electronic control unit detects that the difference between the signals from the Manifold Absolute Pressure (MAP) sensor and the exhaust pressure sensor exceeds the calibrated value (usually 10.35 KPa) for a set period of time (2.5 seconds).

What are the symptoms of a P006B code?

The P006B fault code, also known as MAP (Manifold Absolute Pressure) – Exhaust Pressure Correlation, can cause various symptoms in a vehicle. Here are some common symptoms you might experience:

• Engine malfunction indicator light (CEL) illuminates on the dashboard
• Reduced engine performance or power
• Engine misfires or hesitation during acceleration
• Unstable idle or stalling at idle
• Poor fuel efficiency
• Excessive smoke from the exhaust pipe
• Difficulty starting the engine

What are the causes of a P006B fault code?

Possible causes of the P006B fault code include:

• Faulty or damaged MAP sensor: The MAP sensor may be faulty or physically damaged, leading to inaccurate readings and correlation problems with the expected exhaust pressure.
• Blocked or restricted exhaust pressure sensor line or port: A blocked or restricted line or port connecting to the exhaust pressure sensor can interrupt pressure flow, causing correlation issues.
• Exhaust system leak: Leaks in the exhaust system, such as cracked or damaged pipes or gaskets, can affect exhaust pressure readings and lead to correlation faults.
• Wiring or electrical problems: Problems with the wiring harness, connectors, or electrical connections related to the MAP sensor can cause incorrect readings and trigger the P006B fault code.
• Engine or Turbocharger Problems: Engine or turbocharger malfunctions can lead to abnormal exhaust pressure, triggering related faults.

How to Diagnose P006B Fault Code:

1. Check and test the MAP sensor: Inspect the sensor for signs of damage or malfunction, and measure the output voltage using a multimeter or OBD2 scanner.
2. Check and clean the exhaust pressure sensor’s tubing or intake port: Check for blockages or restrictions that may affect pressure readings, and clean or repair as needed.
3. Check for exhaust system leaks: Inspect the exhaust system for leaks and repair or replace damaged components.
4. Check wiring and electrical connections: Ensure all wiring and electrical connections related to the MAP sensor are secure, undamaged, and properly connected.
5. Thoroughly inspect the engine and turbocharger: Address any underlying engine or turbocharger issues that may be causing abnormal exhaust pressure readings.

How to Fix P006B?

Here are some possible solutions to fix the P006B fault code on your vehicle:

1. Check the exhaust pressure sensor: Use an OBD2 diagnostic tool to check the exhaust pressure sensor for any signs of damage or malfunction. If necessary, replace it with a new, compatible sensor.
2. Check and clean the exhaust pressure tube: Check the exhaust pressure tube for blockages, obstructions, or damage. Thoroughly clean the tube to ensure smooth airflow.
3. Check wiring and connectors: Inspect the wiring harness and connectors connected to the exhaust pressure sensor. Check for loose connections, corrosion, or damage. Repair or replace as needed.
4. Perform an ECM reset: Reset the engine control module (ECM) by disconnecting the battery for a few minutes. Reconnect the battery and start the vehicle to see if the fault code clears.
5. Check the exhaust system for leaks or cracks. Repair any leaks found to ensure accurate pressure readings.
6. Consult a professional: If the above steps do not resolve the issue, it is best to consult a professional mechanic or authorized service center for a more accurate diagnosis and repair.

Please note that these are general suggestions and may not apply to your specific vehicle. It is recommended to refer to the manufacturer’s guidelines and consult a professional for accurate diagnosis and repair.

Specific Vehicle Brand Code P006B Information

P006B Ford — MAP – Exhaust Pressure Related

P006B Lincoln — MAP – Exhaust Pressure Related

P006B Mercury — MAP – Exhaust Pressure Related

How much does it cost to fix P006B?

The cost to fix a P006B code will vary depending on the specific cause of the problem and the labor rates in your area. Generally, replacing the MAP or exhaust pressure sensor costs between $100 and $300 per sensor, including parts and labor. Wiring repairs may add additional costs, and diagnosing the problem may require one to two hours of labor. Overall, the total repair cost for a MAP (exhaust pressure correlation) issue could range from $200 to $600, but it’s recommended to get a quote from a local auto repair shop for a more accurate estimate. Labor rates typically range from $80 to $150 per hour, but prices will vary depending on location and type of shop.