AutoCodes – BMW – P0373 BMW

P0373 BMW Code - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses

Quick Answer

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. Common causes include Timing Reference Optical Sensor harness is open or shorted, Timing Reference Optical Sensor circuit poor electrical connection, Faulty Timing Reference Optical Sensor. 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: P0373 BMW indicates Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses.
Common causes: Common causes include Timing Reference Optical Sensor harness is open or shorted, Timing Reference Optical Sensor circuit poor electrical connection, Faulty Timing Reference Optical Sensor.
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 7,783

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0373 BMW Description

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing. This test monitors the number of high resolution pulses which have been missed (not detected). It's based on a comparison between the number of pulses that were detected since the last pump cam pulse and the number of the pulses that should have occurred. There are approximately 64 high resolution pulses for every cam pulse.

OBDII Code P0373 BMW - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses - AutoCodes.com — P0373 BMW Code - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses

What does this mean?

What are the Possible Causes of the DTC P0373 BMW?

Timing Reference Optical Sensor harness is open or shorted
Timing Reference Optical Sensor circuit poor electrical connection
Faulty Timing Reference Optical Sensor
Damaged Powertrain Control Module (PCM)

How to Fix the DTC P0373 BMW?

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 P0373 BMW 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 P0373 BMW Code

What does the OBDII code P0373 indicate for a BMW?

The P0373 code indicates an intermittent or erratic signal from the timing reference high-resolution signal 'A', which is crucial for the engine's timing and performance.

What symptoms might indicate a P0373 code in my BMW?

Common symptoms include engine misfires, rough idling, poor acceleration, stalling, or a check engine light illuminated on the dashboard.

What are the primary causes of the P0373 code?

Causes can include faulty crankshaft or camshaft position sensors, damaged wiring or connectors, timing belt or chain issues, or problems with the engine control module (ECM).

How can I diagnose the P0373 code in my BMW?

Start by using an OBDII scanner to confirm the code, then inspect the crankshaft and camshaft position sensors, check wiring and connectors for damage, and verify the timing alignment.

What repairs are typically required to fix a P0373 code?

Repairs may involve replacing faulty sensors, repairing or replacing damaged wiring or connectors, or addressing any timing belt or chain issues.

Can I drive my BMW with a P0373 code?

While it might be possible to drive with this code, it can lead to poor engine performance and potential damage, so it's best to address it promptly.

Are there any specific components to inspect first when troubleshooting a P0373 code?

Focus on the crankshaft and camshaft position sensors, as they directly relate to the timing signal, and inspect their wiring and connectors for any signs of wear or damage.

How can I prevent the P0373 code from recurring in my BMW?

Regular maintenance, including timely sensor replacements and wiring inspections, can help prevent recurrence. Additionally, ensure that the timing system is properly maintained.

Is it safe to ignore the P0373 code?

Ignoring the P0373 code is not recommended, as it can lead to further engine issues, decreased performance, and potentially more costly repairs down the line.