P2091 Buick Code - Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Bank 1
Quick Answer
The camshaft position actuator system enables the Engine Control Module (ECM) to change the timing of the camshafts while the engine is operating. Common causes include Faulty Exhaust Camshaft Position Actuator Solenoid Valve Bank 1, Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 harness is open or shorted, Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2091 Buick indicates Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Bank 1.
- Common causes
- Common causes include Faulty Exhaust Camshaft Position Actuator Solenoid Valve Bank 1, Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 harness is open or shorted, Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P2091 Buick Description
Ignition voltage is supplied directly to the Camshaft Position Actuator Solenoid Valve. The ECM controls the solenoid valve by grounding the control circuit with a solid-state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.
The Diagnostic Trouble Code (DTC) will set when the ECM detects a short to voltage in the CMP actuator solenoid circuits for greater than 1 second or a cumulative of 5 seconds, when the solenoid is commanded ON.
What are the Possible Causes of the DTC P2091 Buick?
- Faulty Exhaust Camshaft Position Actuator Solenoid Valve Bank 1
- Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 harness is open or shorted
- Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2091 Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2091 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P2091 Buick Code
1. What does the OBDII code P2091 mean on a Buick?
P2091 indicates a high voltage issue in the Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit for Bank 1, which affects the timing of the exhaust camshaft.
2. What are the common symptoms of code P2091 in a Buick?
Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, difficulty starting, and the Check Engine Light turning on.
3. What causes the P2091 code to appear in a Buick?
Common causes include a faulty exhaust camshaft position actuator solenoid, wiring issues such as shorts or corrosion, or a problem with the powertrain control module (PCM).
4. Can I drive my Buick with a P2091 code?
While it may still be drivable, continuing to drive with this code can lead to reduced performance and potential engine damage. It’s best to address the issue promptly.
5. How do I diagnose a P2091 code on my Buick?
Start by checking the wiring and connectors for the actuator solenoid. Use a multimeter to test for high voltage in the circuit and inspect the solenoid for proper operation.
6. How is the P2091 code fixed on a Buick?
Repairs may include replacing the exhaust camshaft position actuator solenoid, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
7. How much does it cost to repair a P2091 code on a Buick?
Repair costs can vary, but replacing the solenoid typically costs $150-$300, including parts and labor. Wiring or PCM repairs may increase the expense.
8. Can a dirty engine oil cause a P2091 code in a Buick?
Yes, dirty or low engine oil can restrict the actuator solenoid’s operation, potentially triggering this code. Regular oil changes can help prevent this issue.
9. Is resetting the Check Engine Light enough to clear a P2091 code?
Resetting the light without addressing the underlying issue will only temporarily clear the code. The problem must be diagnosed and repaired to prevent it from returning.
10. What tools are needed to diagnose a P2091 code in a Buick?
You’ll need an OBDII scanner, a multimeter to check voltage, and potentially a wiring diagram for your vehicle to trace the circuit.
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