2012 Chevrolet Colorado 4wd-crew-cab OBD2 Code P000B œB Camshaft Position Slow Response

P000B code definition

The P000B code is a generic powertrain code related to fuel and air metering and auxiliary emissions controls. In this case, it means that engine control module (ECM) has detected a fault with the position and timing of the camshaft.

Codes related to the P000B include:

• P000A: “A” Camshaft Position Slow Response (Bank 1)
• P0010: "A" Camshaft Position Actuator Circuit (Bank 1)
• P0011: "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
• P0012: "A" Camshaft Position - Timing Over-Retarded (Bank 1)
• P0013: "B" Camshaft Position - Actuator Circuit (Bank 1)
• P0014: "B" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
• P0015: "B" Camshaft Position - Timing Over-Retarded (Bank 1)
• P0020: "A" Camshaft Position Actuator Circuit (Bank 2)
• P0021: "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
• P0022: "A" Camshaft Position - Timing Over-Retarded (Bank 2)
• P0023: "B" Camshaft Position - Actuator Circuit (Bank 2)
• P0024: "B" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
• P0025: "B" Camshaft Position - Timing Over-Retarded (Bank 2)

What the P000B code means

A P000B code is stored when the ECM, which monitors and checks the actual position of the camshaft versus a target position, sees that the change in position is smaller than a preset threshold, meaning that the response is slow. Whenever an issue is noted, an anti bounce counter keeps track, and if the counter exceeds a predetermined limit specified by the automaker, a P000B code can be stored.

“B” signals that the issue is with Bank 2, which is typically not the Cylinder 1.

What causes the P000B code?

Several problems may cause a P000B code including:

• Possibly loose fuel cap
• Low oil pressure causing erratic camshaft position
• Restriction to oil flow in oil passages
• Restriction to oil flow in variable camshaft timing (VCT) valve body
• Damaged or defective VCT phaser
• Damaged or defective camshaft position sensor
• Damaged or defective camshaft position actuator solenoid
• Binding of the camshaft advance mechanism
• Damaged or defective ECM (rare)

What are the symptoms of the P000B code?

Symptoms of a P000B code may include:

• Check engine or warning light may illuminate
• Vehicle rpm may fluctuate during idle
• May hesitate when going uphill
• There may be no symptoms aside from a stored trouble code

How does a mechanic diagnose the P000B code?

A mechanic may use several methods to diagnose a P000B trouble code, including:

• Utilize an OBD-II scanner to check for a stored P000B trouble code
• Check 2012 Chevrolet Colorado 4wd-crew-cab oil fluid levels and compare to manufacturer specifications
• Check oil fluid pressure
• Check for clogs in oil passages
• Visually inspect the wiring and circuits for signs of damage or corrosion
• Visually inspect the camshaft advance mechanism
• Test camshaft adjustment valve
• Test the camshaft position actuator solenoid

How serious is the P000B code?

Because a 2012 Chevrolet Colorado 4wd-crew-cab's safe driving operation most likely will not be impacted due to faults that store a P000B code, this code is not considered a potentially serious code. When this code appears, it is recommended to take your 2012 Chevrolet Colorado 4wd-crew-cab to your local service center or mechanic for repair and diagnosis as soon as possible.

What repairs can fix the P000B code?

Several repairs can fix a P000B trouble code and include:

• Repair any damaged or shorted, open, or loose wiring or connectors
• Fill oil to manufacturer recommended levels
• Repair or replace damaged or defective oil pump
• Repair or replace damaged or defective camshaft position sensor
• Repair or replace damaged or defective camshaft position actuation solenoid
• Repair or replace damaged or defective camshaft adjustment valve
• Repair or replace damaged or defective ECM (rare)
• Clear all codes, test-drive your 2012 Chevrolet Colorado 4wd-crew-cab, and rescan to see if any codes reappear

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P000B