Trouble Code P0370 – Signal "A" Phase Timing Test Point High Resolution Malfunction, Causes and How to Fix

Introduction (What is Error Code P0370?)

The P0370 error code is listed in the OBD2 list and means that the electronic control unit (ECU) has detected an abnormality in the signal with the symbol marked "A" from the crankshaft or camshaft speed sensor. This signal is used to harmonize the engine operation and ensure precise coordination of ignition and fuel injection.

The P0370 error can affect engine performance, causing misfiring, reduced power, and increased fuel consumption. It can affect the safety of the vehicle, especially under high load conditions.

Meaning and decoding of error code P0370 📊

P0370 – High Resolution Timing Reference Signal «A» Malfunction

P0370 is a code recorded by the ECU when it detects anomalies in the signal from the crankshaft position sensors. This signal comes from a high-resolution sensor that evaluates the position and speed of the engine.

The most common error code P0370 occurs in the following brands of cars:

• Chevrolet
• Ford
• Dodge
• Chrysler
• GMC

Code	Description	Possible problems
P0370	High Resolution Signal "A" Phase Synchronization Check Point Failure	Sensor signal failures, wiring damage, ECU malfunction

P0370 Error Code Symptoms 🚨 (How to Know There's a Problem?)

• The engine runs unstably
• Difficulty starting the engine
• Power loss during acceleration
• Increased fuel consumption
• The Check Engine light comes on

💡 Important! The error symptoms may appear periodically. Sometimes the engine works normally, and sometimes - with interruptions. This complicates diagnostics.

Main causes of error code P0370 ⚠

• Malfunction of the crankshaft position sensor
• Damage or corrosion of connectors and wiring
• Variable signal or open circuit in high resolution circuit
• ECU software failure
• Incorrect sensor installation

Possible reason	How to check?
Faulty shaft position sensor	Check the resistance with a multimeter
Damaged wiring	Inspect for cracks, corrosion or breaks
Problem in ECU	Perform scanning and reflashing of the unit
Loose sensor mount	Visually inspect the fasteners and tighten them.

How to Diagnose Error Code P0370? 🛠 (Step-by-Step Guide)

✅ Step 1: Connect an OBD2 scanner and read the error code ✅ Step 2: Inspect the wiring and sensor connectors for damage ✅ Step 3: Check the sensor output signals with an oscilloscope ✅ Step 4: Make sure the sensor is installed correctly in relation to the reference disk ✅ Step 5: If necessary, perform an ECU test and reflash the software

🛠 Tools you will need:

• OBD2 Diagnostic Scanner
• Multimeter
• Oscilloscope (preferred)
• Set of wrenches and screwdrivers
• Car Electrical Wiring Diagram Handbook

How to Fix Error Code P0370? 🔧 (Troubleshooting)

Simple methods of elimination ✅

• Cleaning and tightening the sensor connectors
• Replacing damaged wiring
• Removing the error code after eliminating the causes
• Check for other related codes

Deep diagnostics and repair ⚙

• Replacing the crankshaft or camshaft position sensor
• Testing and repairing shielded wires
• Reflashing or replacing the engine control unit
• Checking the correctness of signals on an oscilloscope

Symptom	Possible Solution
The engine starts with difficulty	Check and replace the shaft position sensor
Idle speed fluctuations	Clean connectors and contacts
Increased fuel consumption	Perform a synchronization calibration
The error appears periodically	Check ECU and software

How to check error code P0370? 🎥 (Video tutorial)

Frequently Asked Questions (FAQ) ❓

Is it okay to drive with a P0370 error code?

Not recommended. Error P0370 can lead to unstable engine operation, deterioration of dynamics and increased wear of components.

Could the P0370 code be temporary?

Yes, sometimes the error appears due to a short-term signal failure or poor contact. However, if it recurs, diagnostics are required.

What happens if you ignore P0370?

Ignoring the error can lead to ignition problems, increased fuel consumption, and even engine stalling while driving.

How to quickly fix error code P0370?

A quick fix is ​​to check and clean the sensor connectors and reset the error with a scanner. However, a complete fix requires diagnosing the cause of the failure.

Is it necessary to replace the ECU with error P0370?

In rare cases, yes, if all sensors and wiring are in good condition, but the error persists, the engine control unit may need to be repaired or replaced.

Error code P0370 in different cars 🚘

P0370 in Chevrolet

The error is most often associated with a faulty crankshaft position sensor. It is especially relevant for V6 and V8 engines.

P0370 in Ford

Cars of this brand often have breaks in the signal wire or damage to the shielding. Especially in models with 4.6L engines.

P0370 in Dodge

On Dodge Ram and other trucks, the problem may be related to vibration causing the sensor connectors to loosen.

P0370 в Chrysler

Often occurs due to incorrect operation of the ECU. It is recommended to update the software of the control unit.

P0370 in GMC

Found in pickups and SUVs, especially those with high mileage. The cause is outdated sensors and worn wiring.

Related OBD2 Errors 🔗

P0335 – Crankshaft position sensor circuit malfunction

Description: No or unstable signal from the crankshaft position sensor. Possible causes:

• Open circuit
• Damage to the connector
• ECU failure

P0340 – Camshaft position sensor circuit malfunction

Description: Camshaft sensor signal failure. Possible causes:

• Damaged wiring
• Malfunction of the sensor itself
• Synchronization violation

P0016 – Misalignment of the crankshaft and camshaft positions

Description: Synchronization error between camshaft and crankshaft. Possible causes:

• Jumped timing chain
• Gear wear
• ECU failure

Conclusion (What to do if you have a P0370 error code?) ✅

📌 Quick Summary: The P0370 code indicates a problem with the ignition timing due to a faulty signal from the sensor. This affects engine performance and can cause serious damage if ignored.

🚀 Helpful Hint: Don't delay diagnosing this error. The sooner a sensor or wiring problem is fixed, the less likely it is to damage other engine components.