AutoCodes – Land Rover – P0651 Land Rover

P0651 Land Rover Code - Sensor Reference Voltage 'B' Circuit/Open

Quick Answer

The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, 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: P0651 Land Rover indicates Sensor Reference Voltage 'B' Circuit/Open.
Common causes: Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, 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 8,168

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 May 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0651 Land Rover Description

The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.

OBDII Code P0651 Land Rover - Sensor Reference Voltage 'B' Circuit/Open - AutoCodes.com — P0651 Land Rover Code - Sensor Reference Voltage 'B' Circuit/Open

What does this mean?

What are the Possible Causes of the DTC P0651 Land Rover?

Faulty Engine Control Module (ECM)
ECM harness is open or shorted
ECM circuit poor electrical connection
Shorted sensor on 5 volt circuit

How to Fix the DTC P0651 Land Rover?

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 P0651 Land Rover 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 P0651 Land Rover code?

Need more information on how to fix the P0651 Land Rover code? Get Access to Factory Service Manuals

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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 P0651 Land Rover Code

1. What are the common symptoms of OBDII code P0651 in a Land Rover?

- Common symptoms include illuminated Check Engine Light, poor engine performance, and potential stalling or rough idling.

2. What does OBDII code P0651 in a Land Rover indicate?

- OBDII code P0651 indicates a fault in the Sensor Reference Voltage 'B' Circuit/Open, pointing to a problem with the sensor reference voltage circuit.

3. What are the possible causes of OBDII code P0651 in a Land Rover?

- Possible causes include a faulty sensor, damaged wiring or connectors in the circuit, a malfunctioning PCM, or a short circuit.

4. How can I diagnose the cause of OBDII code P0651 in my Land Rover?

- Diagnosis typically involves checking the sensor's wiring and connectors for damage, testing the sensor itself, and using a multimeter to check voltage levels in the circuit.

5. Is it safe to continue driving my Land Rover with OBDII code P0651 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage and potentially unsafe driving conditions.

6. Can I repair OBDII code P0651 in my Land Rover myself?

- Depending on your skill level and access to tools, you may be able to repair this code yourself by addressing the specific cause, such as replacing a faulty sensor or repairing damaged wiring.

7. Will resetting the Check Engine Light make OBDII code P0651 disappear?

- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing OBDII code P0651 will still need to be addressed to prevent the light from coming back on.

8. How much does it typically cost to repair OBDII code P0651 in a Land Rover?

- The cost of repair can vary depending on the specific cause of the code, but it may involve parts replacement, wiring repairs, or diagnostic fees from a professional mechanic.

9. Can a faulty battery or alternator cause OBDII code P0651 to appear in a Land Rover?

- While a faulty battery or alternator can contribute to electrical issues in a vehicle, they are not typically direct causes of OBDII code P0651. It's important to diagnose the specific circuit related to the code.

10. Are there any preventive maintenance steps I can take to avoid OBDII code P0651 in my Land Rover?

- Regular vehicle maintenance, such as checking and replacing sensors as needed, inspecting wiring for damage, and keeping the electrical system in good condition, can help prevent issues that may trigger OBDII code P0651.