AutoCodes – Buick – P0370 Buick

P0370 Buick Code - Timing Reference High Resolution System Performance

Quick Answer

The optical sensor provides a high-resolution signal to Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. Common causes include Faulty Injection Pump, Injection Pump harness is open or shorted, Injection Pump circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0370 Buick indicates Timing Reference High Resolution System Performance.
Common causes: Common causes include Faulty Injection Pump, Injection Pump harness is open or shorted, Injection Pump circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 387

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0370 Buick Description

The optical sensor provides a high-resolution signal to Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. High resolution is an important input by PCM for fuel control and timing. The test monitors the number of high-resolution pulses that have been missed (not detected). The number of pulses detected since the last pump cam pulse is compared to the number of pulses that should have occurred. The Diagnostic Trouble Code (DTC) will be set when a number of high-resolution pulses (internal to PCM) are missing per every 8 cam reference pulses.

OBDII Code P0370 Buick - Timing Reference High Resolution System Performance - AutoCodes.com — P0370 Buick Code - Timing Reference High Resolution System Performance

What does this mean?

What are the Possible Causes of the DTC P0370 Buick?

Faulty Injection Pump
Injection Pump harness is open or shorted
Injection Pump circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0370 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0370 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0370 Buick Code

1. What does the OBDII code P0370 mean on a Buick?

P0370 indicates a problem with the Timing Reference High Resolution System, which affects the vehicle's ability to monitor and control engine timing accurately.

2. What are the common symptoms of the P0370 code on a Buick?

Symptoms may include engine misfires, rough idling, reduced fuel efficiency, poor acceleration, and the check engine light illuminating.

3. What causes the P0370 code on a Buick?

Possible causes include a faulty crankshaft position sensor, damaged timing reference sensor, wiring issues, a malfunctioning powertrain control module (PCM), or mechanical timing problems.

4. Can you drive a Buick with the P0370 code?

While the vehicle may still be drivable, it is not recommended as it can lead to further engine damage, reduced performance, and poor fuel economy.

5. How is the P0370 code diagnosed on a Buick?

A mechanic will use a scan tool to confirm the code, visually inspect wiring and connectors, and test the crankshaft position sensor and timing reference circuit for proper operation.

6. How do you fix the P0370 code on a Buick?

Repairs may involve replacing the faulty crankshaft position sensor, repairing damaged wiring, cleaning corroded connections, or addressing mechanical timing issues.

7. Can a faulty PCM cause the P0370 code in a Buick?

Yes, a malfunctioning PCM can fail to interpret timing signals correctly, resulting in the P0370 code, though this is less common compared to sensor or wiring issues.

8. What tools are needed to troubleshoot the P0370 code on a Buick?

A professional-grade OBDII scanner, a multimeter, and possibly an oscilloscope are commonly used to diagnose and troubleshoot this code.

9. How much does it cost to fix the P0370 on a Buick?

The repair cost depends on the root cause but typically ranges from $100 to $300 for sensor replacement or wiring repairs. More extensive repairs, like PCM replacement, could cost more.

10. Can a weak battery trigger the P0370 code on a Buick?

A weak or failing battery can cause electrical issues that might interfere with the timing reference system, though this is not a common cause of the P0370 code.