P0370
UniversalTiming Reference High Resolution Signal A Malfunction
High SeverityThis code indicates the powertrain control module (PCM) has detected an irregular signal from the timing reference sensor (often the crankshaft position sensor). This malfunction means the engine's computer cannot accurately determine engine position or speed, leading to severe performance issues.
⚠️ Before You Begin (Safety First)
Always wear appropriate personal protective equipment, such as safety glasses and gloves, when working on a vehicle. Ensure the engine is completely cool before starting any work. Disconnect the battery before attempting any electrical repairs to prevent accidental shorts or injury.
Common Symptoms
- Engine misfires
- Rough idle
- Engine stalling
- Engine cranks but won't start
- Reduced engine power
- Check Engine Light illuminated
Common Causes
- Faulty Crankshaft Position Sensor (CKP)
- Faulty Camshaft Position Sensor (CMP)
- Damaged or corroded wiring or connectors for the sensor
- Incorrectly installed timing reference sensor
- Problem with the Engine Control Module (ECM) or Powertrain Control Module (PCM)
Frequently reported on: All Makes
Diagnostic Steps
- Inspect the wiring harness and connectors for the crankshaft and camshaft position sensors for any signs of damage, corrosion, or loose connections.
- Visually inspect the crankshaft and camshaft position sensors for any physical damage or contamination.
- If possible, test the resistance of the sensor using a multimeter (refer to your vehicle's service manual for specifications).
- If the sensor is suspected to be faulty or if no obvious wiring issues are found, replace the suspected timing reference sensor (usually the crankshaft position sensor first).
- Clear the P0370 code and retest the vehicle to see if the code returns.
👨🔧 When to Call a Professional
If you have checked and replaced the crankshaft or camshaft position sensor and the wiring, and the P0370 code persists, it's time to consult a professional mechanic. A persistent P0370 could indicate a more complex underlying issue, such as a problem with the PCM itself or a critical engine timing component that requires specialized diagnostic tools.
Commonly Asked Questions
What is a timing reference high resolution signal?
It's an electrical signal sent by a sensor (usually the crankshaft or camshaft position sensor) to the engine's computer, providing precise information about the engine's rotational position and speed. This is crucial for ignition and fuel injection timing.
Can I drive with a P0370 code?
It is not recommended to drive with a P0370 code. The vehicle may experience severe drivability issues, including stalling, misfires, or a no-start condition, which can be dangerous and potentially cause further engine damage.
Is P0370 related to the crankshaft position sensor?
Yes, P0370 often points to a problem with the crankshaft position sensor, as it's a primary source for the high-resolution timing reference signal. However, it can also sometimes be related to the camshaft position sensor.
How do I clear the P0370 code?
After performing repairs, you can clear the code using an OBD-II scan tool. Disconnecting the battery for a short period might also clear the code, but it's always best to use a scan tool to ensure a proper reset and to confirm the repair.
What tools do I need to diagnose P0370?
An OBD-II scan tool to read and clear codes, a multimeter for testing sensor resistance and wiring continuity, and basic hand tools for sensor replacement are typically needed.