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P0385 Acura Code - Crankshaft Position Sensor 'B' No Signal

Quick Answer

The P0385 code for Acura vehicles indicates that the Crankshaft Position Sensor 'B' is not sending a signal to the Engine Control Module (ECM). Common causes include Faulty crankshaft position sensor 'B', Wiring issues or short circuits in the sensor circuit, Corrosion or poor connections in the sensor wiring. 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
P0385 Acura indicates Crankshaft Position Sensor 'B' No Signal.
Common causes
Common causes include Faulty crankshaft position sensor 'B', Wiring issues or short circuits in the sensor circuit, Corrosion or poor connections in the sensor wiring.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0385 Acura Description

The P0385 code for Acura vehicles indicates that the Crankshaft Position Sensor 'B' is not sending a signal to the Engine Control Module (ECM). The crankshaft position sensor is a vital component in the engine management system, as it detects the position of the crankshaft in relation to the engine's timing. This information is crucial for the ECM to accurately determine ignition timing and fuel injection timing, ensuring optimal engine performance.

OBDII Code P0385 Acura - Crankshaft Position Sensor 'B' No Signal
P0385 Acura Code - Crankshaft Position Sensor 'B' No Signal

Common Causes of P0385 Acura

  1. Faulty crankshaft position sensor 'B'
  2. Wiring issues or short circuits in the sensor circuit
  3. Corrosion or poor connections in the sensor wiring
  4. ECM software or hardware issues
  5. Mechanical engine problems affecting sensor operation

Symptoms of P0385 Acura

  1. Engine misfires
  2. Rough idling
  3. Stalling
  4. Difficulty starting the engine
  5. Decreased fuel efficiency

How to Fix P0385 Acura

  1. Diagnose the issue by using a scan tool to confirm the P0385 code and perform a visual inspection of the sensor and its wiring.
  2. Test the crankshaft position sensor 'B' using a multimeter to check for proper voltage and signal output.
  3. Replace the faulty crankshaft position sensor 'B' if it fails testing, ensuring proper installation and secure connections.
  4. Clear the fault code from the ECM using a scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be necessary to identify and address any underlying issues with the sensor circuit or ECM.

Cost to Fix P0385 Acura

The typical repair costs for addressing a P0385 code in an Acura vehicle can vary depending on the specific model and year. In general, the cost of replacing a crankshaft position sensor 'B' ranges from $100 to $300, including parts and labor. Additional diagnostic fees and labor costs may apply, with total repair costs potentially reaching $200 to $500 or more.

What does this mean?

Tech Notes for P0385 Acura

Sometimes and in some models, low battery voltage or a weak starter can trigger a Crankshaft Position Sensor code. Before replacing any parts, recharge or replaced battery.

When is the Code Detected?

The crankshaft position sensor (POS) signal is sent to the Electronic Control Module (ECM) during the first few seconds of engine cranking is out of range

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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 P0385 Acura Code

1. What are the common symptoms of OBDII code P0385 in an Acura vehicle?

The common symptoms of OBDII code P0385 in an Acura include engine stalling, difficulty starting the engine, and poor acceleration.

2. What is the most common cause of OBDII code P0385 in an Acura?

The most common cause of OBDII code P0385 in an Acura is a faulty crankshaft position sensor 'B' that is not sending a signal to the engine control module.

3. How does a faulty crankshaft position sensor 'B' cause OBDII code P0385 in an Acura?

A faulty crankshaft position sensor 'B' fails to send accurate data to the engine control module, which can disrupt the engine's timing and lead to the triggering of OBDII code P0385.

4. Can a bad crankshaft position sensor 'B' be repaired, or does it need to be replaced?

In most cases, a bad crankshaft position sensor 'B' in an Acura needs to be replaced to resolve OBDII code P0385. Repairing the sensor is not recommended due to its critical role in engine operation.

5. How can I diagnose a faulty crankshaft position sensor 'B' causing OBDII code P0385 in my Acura?

Diagnosing a faulty crankshaft position sensor 'B' involves using a scan tool to monitor the sensor's signal output while cranking the engine. If the sensor fails to provide a signal, it is likely faulty.

6. Are there any other potential causes of OBDII code P0385 in an Acura besides a faulty crankshaft position sensor 'B'?

Yes, other potential causes of OBDII code P0385 in an Acura include damaged wiring or connectors related to the sensor, a failed engine control module, or issues with the sensor's reluctor ring.

7. Can driving with OBDII code P0385 in an Acura cause further damage to the vehicle?

Continuing to drive with OBDII code P0385 in an Acura can potentially lead to further engine performance issues, increased fuel consumption, and even engine damage if left unresolved for an extended period.

8. Is it safe to clear OBDII code P0385 in an Acura using a scan tool without addressing the underlying issue?

Clearing OBDII code P0385 without fixing the root cause, such as a faulty crankshaft position sensor 'B', is not recommended. The issue will likely resurface, and the vehicle may continue to experience problems.

9. How long does it typically take to replace a faulty crankshaft position sensor 'B' in an Acura to resolve OBDII code P0385?

Replacing a faulty crankshaft position sensor 'B' in an Acura to address OBDII code P0385 usually takes about 1-2 hours, depending on the vehicle model and the sensor's accessibility.

10. Can I replace the crankshaft position sensor 'B' in my Acura myself, or should I seek professional assistance?

Replacing the crankshaft position sensor 'B' in an Acura requires moderate mechanical skill and knowledge. If you are comfortable working on your vehicle and have the necessary tools, you can attempt the replacement yourself. Otherwise, it is recommended to seek professional assistance to ensure the job is done correctly.

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