AutoCodes – Isuzu – P0653 Isuzu

P0653 Isuzu Code - 5 Volt Reference 2 Circuit High Voltage

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: P0653 Isuzu indicates 5 Volt Reference 2 Circuit High Voltage.
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 6,307

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 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0653 Isuzu 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 P0653 Isuzu - 5 Volt Reference 2 Circuit High Voltage - AutoCodes.com — P0653 Isuzu Code - 5 Volt Reference 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0653 Isuzu?

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 P0653 Isuzu?

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 P0653 Isuzu 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 P0653 Isuzu code?

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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 P0653 Isuzu Code

1. What does the OBDII code P0653 mean on an Isuzu vehicle?

P0653 indicates that there is a high voltage issue in the "5 Volt Reference 2" circuit, which supplies power to various engine sensors.

2. What are the common symptoms of code P0653 in an Isuzu?

Symptoms may include a Check Engine Light, poor engine performance, erratic sensor readings, or issues with systems reliant on the affected sensors.

3. What causes the P0653 code to appear on an Isuzu?

Common causes include a damaged or shorted wiring harness, a faulty sensor, a malfunctioning Engine Control Module (ECM), or corrosion in electrical connections.

4. Can I drive my Isuzu with the P0653 code?

Driving with this code may be possible but is not recommended due to potential engine performance issues and the risk of causing further damage.

5. How do I diagnose the P0653 code on my Isuzu?

Start by checking the wiring and connectors for damage or corrosion. Use a multimeter to test the 5-volt reference circuit and inspect sensors connected to it.

6. Which sensors are connected to the 5 Volt Reference 2 circuit in an Isuzu?

Sensors commonly connected include the throttle position sensor (TPS), manifold absolute pressure (MAP) sensor, and other engine management sensors.

7. How can I fix the P0653 code on my Isuzu?

Repairs may involve replacing damaged wiring, cleaning corroded connections, replacing a faulty sensor, or reprogramming/replacing the ECM.

8. Is the P0653 code specific to Isuzu vehicles?

No, the P0653 code is a generic OBDII code applicable to all vehicles, but its causes and affected circuits may vary depending on the manufacturer.

9. How much does it cost to repair the P0653 code on an Isuzu?

Costs vary depending on the root cause, but repairs typically range from $100 for minor wiring fixes to $1,000 or more if the ECM needs replacement.

10. Can a weak battery cause the P0653 code in an Isuzu?

While uncommon, a weak battery or charging system issue could lead to voltage irregularities that trigger this code. Always ensure the battery and alternator are in good condition.