P0368 — Camshaft Position Sensor “B” Circuit High #

Note: The code description for P0368 may differ depending on the vehicle manufacturer.

• P0368: Camshaft Position Sensor “B” Circuit High (Generic/SAE)
• P0368: Camshaft Position Sensor B, Bank 1, High Input (Ford, GM)
• P0368: CMP Sensor B Circuit High Input, Bank 1 (Chrysler, Dodge, Jeep)
• P0368: Camshaft Pos. Sensor “B” Circuit High, Bank 1 (Toyota, Honda)

Summary of Code P0368 #

P0368 is an OBD-II diagnostic trouble code that signals a high voltage condition detected by the Engine Control Module (ECM) in the Camshaft Position Sensor “B” circuit on Bank 1 (the side of the engine containing cylinder #1). The camshaft position sensor (CMP sensor) tracks the position of the camshaft, allowing the ECM to synchronize fuel injection and ignition timing. A “high” circuit means the ECM is seeing a voltage above its expected range, often due to wiring or sensor faults. The “B” sensor typically refers to the exhaust camshaft on DOHC (Dual Overhead Camshaft) engines. If this signal is out of range, engine timing will be affected and drivability issues may result. Most vehicles will illuminate the Check Engine Light and may enter a fail-safe mode.

Frequent Symptoms for Code P0368 #

When a P0368 code sets, you may notice a change in how your vehicle runs. While some drivers experience minimal symptoms, others report pronounced performance concerns. Here are the most common indicators:

• Check Engine Light is illuminated
• Rough engine idle
• Engine misfires, especially at startup or under load
• Reduced power or acceleration
• Poor fuel economy
• Hard starting or no start condition
• Possible stalling at idle

Probable Causes for Code P0368 #

The root cause of a P0368 code is an abnormally high voltage detected in the camshaft position sensor “B” circuit. Causes are most often electrical, but mechanical issues cannot be ruled out. In order of likelihood, here are the most common sources:

1. Faulty Camshaft Position Sensor “B” (sensor failure or internal short)
2. Damaged wiring harness (open circuit, short to voltage, corroded connectors)
3. Defective or loose sensor connector
4. Faulty ECM (rare, but possible)
5. Shorted or blown fuse (if sensor shares fused circuit)
6. Improper sensor installation or aftermarket/non-OEM sensor incompatibility
7. Mechanical timing issues (e.g. stretched timing chain/belt) affecting cam sensor reading

Step-by-Step Diagnosis for Code P0368 #

Diagnosing P0368 requires a methodical approach, as electrical issues can masquerade as sensor faults. Here’s a practical step-by-step guide:

• Retrieve all stored codes and freeze-frame data with a professional scan tool.
• Visually inspect the camshaft position sensor “B” and its wiring harness for damage, corrosion, or loose connections.
• Check the sensor connector for bent or pushed-out pins, moisture, or dirt.
• Test the sensor’s reference voltage (typically 5V) and ground with a digital multimeter.
• Using an oscilloscope or scan tool, monitor the camshaft position sensor waveform for irregularities.
• If possible, swap the suspect sensor with the “A” sensor (if identical), and observe if the code follows the sensor.
• Inspect wiring continuity between the sensor and ECM using a wiring diagram.
• Check for related codes (crankshaft position sensor, timing codes) that might indicate a broader issue.
• If no faults found, consider ECM testing or replacement as a last resort.

Possible Repairs for Code P0368 #

Once the cause is pinpointed, repairs should address the root issue directly. Common solutions include:

• Replace faulty camshaft position sensor “B” with an OEM-quality part
• Repair or replace damaged wiring or corroded connectors
• Clean and secure the sensor connector
• Replace blown fuse or repair shorted circuit (if applicable)
• Reinstall or correctly torque the sensor if found loose
• Solve underlying engine timing issues if mechanical faults are found
• Replace ECM only after confirming all other components are functional

Can You Drive With Code P0368? #

Limited. While the vehicle may still start and run with a P0368 code, drivability will likely be compromised. Expect rough running, reduced power, and possible stalling. Extended driving can lead to catalytic converter damage from unburned fuel or increased emissions. It’s best to diagnose and repair this issue as soon as possible to avoid further complications or breakdowns.

Vehicles Most Commonly Affected by Code P0368 #

P0368 is a generic OBD-II code and may appear on any modern vehicle, especially those using dual camshaft sensors per bank. However, it is most frequently reported on:

• Ford (F-150, Explorer, Fusion, Edge)
• Chevrolet (Silverado, Malibu, Equinox)
• Dodge/Chrysler/Jeep (Ram 1500, Charger, Grand Cherokee)
• Toyota (Camry, Corolla, Tacoma)
• Honda (Accord, Civic, CR-V)
• Nissan (Altima, Pathfinder, Rogue)
• Hyundai/Kia (Sonata, Elantra, Sorento)

Common Mistakes & Best Practices for Code P0368 #

Even experienced technicians can trip up on P0368. Avoid these pitfalls and follow industry best practices:

• Replacing the camshaft sensor without checking wiring or connector integrity first
• Using low-quality aftermarket sensors that may not meet OEM specifications
• Neglecting to clear codes or recheck after repairs
• Overlooking related timing or crankshaft sensor codes
• Failing to document freeze-frame data before erasing codes

Express FAQ for Code P0368 #

Q: Is P0368 a sensor or wiring problem?
A: Often, it’s either the sensor itself or wiring/connectors. Testing both is essential before replacement.

Q: Will replacing the camshaft sensor always fix P0368?
A: Not always. The issue may lie in the wiring, connector, or rarely, the ECM. Proper diagnosis is key.