P2091 B Camshaft Position Actuator Control Circuit High Bank 1

P2091 B Camshaft Position Actuator Control Circuit High Bank 1

OBD-II DTC Datasheet

B Camshaft Position Actuator Control Circuit Bank 1 High

What does this mean?

This is a Generic Powertrain Diagnostic Trouble Code (DTC) applicable to many OBD-II vehicles (1996 and newer). This may include, but is not limited to, Subaru, Cadillac, Dodge, Mazda, Audi, Mercedes, etc. Despite the general nature, the exact repair steps may vary depending on the model year, make, model and transmission configuration.

OBD-II DTC P2091 relates to the bank 1 Camshaft Position Actuator Control Circuit B. When the Engine Control Module (ECU) detects abnormal signals in the Camshaft Position B Actuator Control Circuit Code, P2091 sets and the engine light comes on. will glow. Some vehicles may take multiple failure cycles before the check engine light comes on.

The purpose of the camshaft position actuator control circuitry is to monitor changes between the camshaft (s) and the crankshaft and send a signal to the ECU. This process is carried out using camshaft and crankshaft position sensors that convert varying degrees between the camshaft / s and crankshaft into a voltage signal that is used by the ECU to adjust timing and optimize engine performance.

This code is identified as B Camshaft Position Actuator Control Circuit Bank 1 and indicates a too high electrical condition detected on Camshaft Position Actuator Control Circuit B at Bank 1, as previously mentioned.

Note. Camshaft "A" is the intake, left or front camshaft. Conversely, the "B" camshaft is either the exhaust, right hand, or rear camshaft. Left/Right and Front/Rear are defined as if you were sitting in the driver's seat. Bank 1 is the side of the engine that contains cylinder #1, and bank 2 is the opposite. If the engine is in-line or straight, then there is only one bank.

Typical Camshaft Position Sensor:

What is the severity of this DTC?

The severity of this code can vary greatly, from a simple check engine light on a car that starts and moves to a car that idles abruptly or won't start at all. The code can be serious depending on the symptoms present. If the code is caused by a faulty timing chain or belt, the result may be internal engine damage.

What are some of the symptoms of the code?

Symptoms of a P2091 trouble code may include:

• Rough engine idling
• Low oil pressure
• Engine may malfunction
• Poor engine performance
• Increased fuel consumption
• Change oil or service light is on soon
• Check engine light is on

What are some of the common causes for the code?

Reasons for this P2091 code may include:

• Worn timing belt or chain
• Faulty valve timing solenoid
• The drive of the variable valve timing system is faulty.
• Engine oil level is too low
• Blown fuse or jumper wire (if applicable)
• Synchronization component misalignment
• Corroded or damaged connector
• Faulty or damaged wiring
• Defective ECU

What are some steps to troubleshoot the P2091?

The first step in troubleshooting any problem is to review the vehicle-specific technical service bulletins (TSBs) by year, model, and engine combination. In some cases, this can save you a lot of time in the long run by pointing you in the right direction.

The second step is to check the level and condition of the oil. Correct oil pressure plays a key role in the operation of this circuit. Then locate all components in that circuit and perform a thorough visual inspection to check the associated wiring for obvious defects such as scratches, abrasions, exposed wires, or burn marks. Next, you should check the connectors for security, corrosion and damage to the contacts. This process should include all related sensors, components, and ECUs.

Advanced steps

The additional steps become very specific to the vehicle and require the appropriate advanced equipment to be accurately performed. These procedures require a digital multimeter and vehicle specific technical reference documents. Other ideal tools for this situation are a time indicator and an oil pressure gauge. Voltage requirements depend on the year of manufacture and vehicle model.

Time check

The timing must be checked with appropriate test equipment and the settings must be accurate for proper engine operation. An incorrect timing reading indicates that important timing components such as belt, chain or gears may be worn or damaged. If this code appears immediately after replacing the timing belt or chain, then you may suspect misalignment of timing components as a possible cause.

Voltage test

The camshaft and crankshaft sensors are typically supplied with a reference voltage of approximately 5 volts from the ECM.

If this process detects that a power source or ground is missing, a continuity test may be required to verify the integrity of wiring, connectors, and other components. Continuity tests should always be done with power disconnected from the circuit and normal wiring and connection readings should be 0 ohms of resistance. Resistance or no continuity indicates faulty wiring that is open or shorted and requires repair or replacement.

What are the standard ways to fix this code?

• Replacing the valve timing solenoid
• Replacing the variable valve timing drive
• Replacing a blown fuse or fuse (if applicable)
• Cleaning connectors from corrosion
• Repair or replace faulty wiring
• Oil and filter change
• Replacing the timing belt or chain
• ECU firmware or replacement

Common mistakes can include:

Replacing either ECUs or sensors is often done by mistake when the problem is incorrect timing or insufficient oil pressure.

Hopefully, the information in this article has helped point you in the right direction to troubleshoot your camshaft position actuator control circuit DTC problem. This article is for informational purposes only and specific technical data and service bulletins for your vehicle should always take priority.

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