AutoCodes – Generic – B20A0

B20A0 Code - Cranking Request Circuit

Quick Answer

The Engine Control Module (ECM) monitors the Cranking Request Circuit. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: B20A0 indicates Cranking Request Circuit.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 1,883

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 Sep 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B20A0 Description

The Engine Control Module (ECM) monitors the Cranking Request Circuit. When the Cranking request signal from ECM and the Starter control relay control signal from ECM (CAN) do not match, a malfunction is detected and the OBDII code is set.

OBDII Code B20A0 - Cranking Request Circuit - AutoCodes.com — B20A0 Code - Cranking Request Circuit

What does this mean?

What are the Possible Causes of the DTC B20A0?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection
Faulty Intelligent Power Distribution Module (IPDM)

How to Fix the DTC B20A0?

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 B20A0 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.

Need more information about the B20A0 code?

Need more information on how to fix the B20A0 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B20A0 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B20A0 Infiniti — Cranking Request Circuit
B20A0 Nissan — Cranking Request Circuit

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 B20A0 Code

1. What are the common symptoms of OBDII code B20A0 (Cranking Request Circuit)?

- Common symptoms include difficulty starting the engine, stalling after starting, and intermittent starting issues.

2. What can cause the OBDII code B20A0 to trigger?

- The code B20A0 can be triggered by a faulty crankshaft position sensor, damaged wiring or connectors in the cranking request circuit, or a problem with the engine control module.

3. How can I diagnose the OBDII code B20A0?

- Diagnosing the code B20A0 involves using a scan tool to retrieve the trouble codes, testing the crankshaft position sensor, inspecting the wiring and connectors in the cranking request circuit, and checking the engine control module for any issues.

4. Can a weak battery or alternator cause the OBDII code B20A0 to appear?

- Yes, a weak battery or alternator can cause voltage fluctuations in the cranking request circuit, which may trigger the code B20A0.

5. What are some repair tips for fixing the OBDII code B20A0?

- Repair tips include checking and replacing the crankshaft position sensor, repairing any damaged wiring or connectors, ensuring proper voltage supply to the circuit, and reprogramming or replacing the engine control module if needed.

6. Is it safe to continue driving with the OBDII code B20A0 present?

- It is not recommended to continue driving with the code B20A0 present, as it can lead to potential starting issues and engine performance problems.

7. Can a DIY enthusiast repair the OBDII code B20A0 at home?

- Depending on the level of expertise, a DIY enthusiast may be able to diagnose and repair the code B20A0 at home by following proper diagnostic procedures and using the necessary tools.

8. How much does it typically cost to repair the OBDII code B20A0 at a mechanic or dealership?

- The cost of repairing the OBDII code B20A0 can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

9. Will resetting the OBDII code B20A0 make it go away permanently?

- Resetting the code B20A0 may temporarily clear the error code, but if the underlying issue is not fixed, the code is likely to reappear after some time.

10. Is the OBDII code B20A0 specific to a certain make or model of vehicle?

- The OBDII code B20A0 is a generic code that can appear in various makes and models of vehicles, but the specific diagnostic and repair procedures may vary.