Best Guide to Fix P0019 Trouble Code With Images

Last Updated on November 7, 2026

What does the P0019 code mean?

The P0019 code means the engine computer sees an unexpected relationship between the crankshaft position and the Bank 2 Sensor B camshaft position. On most dual-cam engines, Sensor B is the exhaust side. Bank 2 is the bank that does not contain cylinder number one. Use the cylinder layout and the factory code description for your engine to identify it.

The crankshaft and camshafts are timed together by a chain or belt. The position sensors send signals as the shafts turn. The control module checks where the exhaust cam signal appears relative to the crank signal. A shifted timing drive can change that relationship. So can a phaser that parks in the wrong position, a moved reference wheel, or a signal that drops out. The test that fails determines the repair.

Pay attention to the bank and sensor letters on the scan. P0018 covers Sensor A on Bank 2. P0017 covers Sensor B on Bank 1. When a Bank 2 engine-position performance fault also appears, check the pattern across both camshafts. It can help you decide whether to begin with a shared timing or crankshaft reference check.

Quick Tips (Causes & Solutions)

Causes:

• A stretched chain, loose tensioner, damaged belt or incorrect timing after a repair.
• A phaser, oil control valve or oil supply issue that puts the camshaft out of position.
• A shifted cam or crank reference wheel or an intermittent position signal.
• A connector, harness or circuit problem identified by companion codes or testing.

Solutions:

• Save all codes and freeze-frame data, then confirm the engine and bank layout.
• Check oil, recent work and the relevant connections before ordering parts.
• Compare cam and crank signals with the correct reference, and verify timing when the data points there.
• Repair the confirmed fault and run the specified verification before calling the job finished.

What are the causes of the P0019 code?

Start with what changed before the light came on. A code that appears immediately after timing work is an important clue. One that appears with an intermittent signal at a certain temperature calls for a different check.

• Oil supply or VVT operation. Low oil level, incorrect viscosity, restricted flow or inadequate oil pressure can affect a hydraulic tensioner or phaser. Check the actual oil specification and pressure limits for your engine. A sticking valve or worn phaser can move the exhaust cam away from its expected position.
• Mechanical timing. A worn chain, damaged belt, loose guide or failing tensioner can cause the shafts to lose alignment. A chain or belt installed out of position can set the code even when the parts are new.
• Position sensor and reference faults. An intermittent connection can cause missing or irregular pulses. A moved or damaged reluctor can shift the pulses even while the sensor generates a clean signal. Scope data and an alignment check help separate these possibilities.
• Actuator circuit or connector trouble. The Bank 2 intake actuator has its own circuit code, P0020. If a circuit code accompanies P0019, follow the manufacturer’s diagnostic order. Use the correct wiring diagram for the camshaft and actuator you are testing.
• A confirmed module or software issue. An issue in the system of the PCM needs a test result or an applicable bulletin before you consider programming or replacement. Verify the signals, power supplies, grounds and timing evidence first.

For a specific example, GM documented a pattern of multiple timing or engine-position codes on certain High Feature V6 applications, including some Chevrolet Traverse and GMC Acadia engines. Its procedure calls for checking loose chains and tensioners, then inspecting the crankshaft reluctor if the normal tests fail to identify the cause. When that bulletin applies and the reluctor has moved, GM specifies replacing the crankshaft. Confirm the engine and the finding before approving that repair.

What are the symptoms of the P0019 code?

• A steady check engine light, sometimes with the car still driving normally.
• A longer crank, a rough start or stalling when the timing problem affects combustion.
• Uneven idle, hesitation, lower power or increased fuel use.
• A rattle near the timing cover when chain slack, tensioner trouble, a phaser fault or low pressure is involved.

Record when you hear a noise or feel a change in performance. A short startup rattle, a steady knock and a vibration under load can have different causes. A rattle on its own does not identify a damaged reluctor or harmonic balancer.

How to diagnose the P0019 code?

Save the fault codes found and any freeze-frame information before clearing anything. Pay attention to whether P0019 appears alone, with P0018, or with similar codes on Bank 1. The pattern can help identify a local exhaust-cam problem or a wider timing issue.

1. Identify the engine and check service history. Confirm Bank 2 Sensor B using the vehicle’s service information. Ask whether someone recently worked on the timing drive, cylinder head, phaser, crank sensor or wiring. Check applicable manufacturer bulletins by build and engine.
2. Check oil and visible connections. Verify the level, viscosity and filter. Look for a pinched harness, loose plug, oil in a connector or a terminal pushed out of place. If the oil-pressure warning or another clue points to pressure, have it measured at the specified temperature and engine speed.
3. Compare signal quality and alignment. Check the relevant sensor circuit faults first as directed. A scope can show whether the cam signal drops out or stays clean but arrives at the wrong point relative to the crank signal. Compare it with a known-good pattern for the exact engine. Check the actual versus desired cam angle where supported.
4. Verify the base timing and phaser position. A single affected cam can lead to a local signal or phaser check. A consistent shift across more than one cam can justify checking the shared drive and crank reference. These are starting points for the manufacturer’s tests. Follow the alignment procedure and use the specified locking tools when the timing cover needs to come off.

The OBD-II scanning tool

A basic code reader can identify the P0019 code and may display freeze frame. Enhanced cam position readings and actuator commands require support for the specific vehicle. If you are booking a diagnosis, ask whether the shop can check cam and crank waveforms or mechanical timing if the initial scan points there.

How serious is the P0019 code?

If the car starts and idles normally with a steady light, book diagnosis promptly and avoid heavy load while you arrange it. If it stalls, loses power suddenly or develops a loud new timing rattle, get it off the road safely and arrange recovery. Shut the engine off safely if the oil-pressure warning appears. A flashing check engine light with shaking can indicate a damaging misfire and needs prompt attention.

Low oil pressure can affect the engine’s oil control valves, which meter oil for cam timing. A separate P0007 fuel shutoff fault has its own diagnostic path. If the timing drive may have slipped, let a technician inspect it before you keep cranking or attempt a road test. An alignment fault can cause internal damage on some engines.

What parts need repair to solve the P0019 code?

Use the diagnostic results to decide which of the following areas needs work. Different faults can produce similar scan results and symptoms.

Camshaft and the crankshaft

Check how the sensors read each shaft, including the wiring and the reference targets. A sensor with an intermittent signal requires a different repair from a wheel that has moved. Confirm the target’s position using the procedure for the engine.

Oil control valve and Oil filters

The oil control valve meters oil to the cam phaser. Check valve movement, oil supply and any serviceable screens when the tests call for it. Use the correct oil filter and fix the cause of low pressure or a restricted feed before replacing a phaser.

Timing components

Inspect the chain or belt, sprockets, guides, tensioner and phaser as fitted. A damaged belt or sprocket needs replacement according to the service procedure. Verify mechanical alignment and check why the drive moved before completing the job.

Wiring, connectors, and electrical circuits

Repair confirmed terminal damage, poor grounds and broken or chafed wires with approved parts and routing. Repeat the circuit or signal test under the conditions that triggered the code.

Checking the PCM

Check that the module has the specified power, grounds and sensor inputs. A software update or module repair should follow an applicable manufacturer procedure. Retain the code history and test results so you can verify the same fault after the repair.

How to Fix the P0019 Code

Repair the fault the tests identify. Use the exact service procedure when the work involves a phaser, timing drive or crankshaft reference wheel.

• Restore a damaged connection or replace a sensor that failed its circuit or signal test. Recheck the signal before moving on.
• Correct a confirmed valve, oil-feed or pressure problem. Use the specified parts and oil, then compare the commanded and actual camshaft position where the scan tool supports it.
• Correct timing and replace worn parts using the engine-specific alignment sequence. Recheck timing before restarting. Follow the manufacturer’s repair for a confirmed moved reluctor.
• Carry out any required relearn. Clear codes at the stage specified by the service procedure and repeat the relevant monitor or verification drive only when the vehicle is safe. Confirm that the fault does not return and the engine runs as expected.

Repair Cost

Ask for a quote after the cause is confirmed. A terminal repair, oil service, valve replacement and timing-chain job vary widely in parts and access. A crankshaft replacement on an affected engine is a separate estimate from a sensor replacement. Ask the shop to list diagnostic labor, parts, repair labor and any relearn or verification separately.

The P0019 code gives you a useful starting point. Before paying for a timing repair, ask what signal comparison or alignment check confirmed it. Save that finding with your original scan so you can compare the results after the repair.

More Powertrain Codes: P0016, P0017, P0018, P0020