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AutoCodes – Isuzu – P0654 Isuzu

P0654 Isuzu Code - Engine Speed Output Circuit

Quick Answer

The Instrument Panel Cluster (IPC) supplies a voltage to the Engine Speed Output circuit. Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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
P0654 Isuzu indicates Engine Speed Output Circuit.
Common causes
Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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 3,824
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on May 02, 2019
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Code P0654 Isuzu Description

The Instrument Panel Cluster (IPC) supplies a voltage to the Engine Speed Output circuit. The Powertrain Control Module (PCM) creates the Engine Speed Output signal by rapidly grounding this circuit via an internal switch called a driver. The other components on this circuit recognize the voltage being pulled to ground as an indication of engine speed. The driver supplies the ground for the component being controlled. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM commands the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage).
OBDII Code P0654 Isuzu - Engine Speed Output Circuit - AutoCodes.com
P0654 Isuzu Code - Engine Speed Output Circuit
What does this mean?

What are the Possible Causes of the DTC P0654 Isuzu?

  • Faulty Instrument Cluster
  • Instrument Cluster harness is open or shorted
  • Instrument Cluster circuit poor electrical connection
  • Faulty PCM

How to Fix the DTC P0654 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 P0654 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 P0654 Isuzu code?

Need more information on how to fix the P0654 Isuzu code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0654 Isuzu code diagnosed by a professional: Find a repair shop in your area

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 P0654 Isuzu Code

1. What does OBDII code P0654 mean on an Isuzu?

P0654 indicates an issue with the engine speed output circuit, which may involve the signal sent from the engine control module (ECM) to components like the tachometer.

2. What are the symptoms of code P0654 on an Isuzu?

Common symptoms include a non-functional or erratic tachometer, poor engine performance, and, in some cases, the engine may fail to start.

3. What causes the P0654 code on an Isuzu?

Possible causes include a faulty engine speed sensor, damaged wiring or connectors in the engine speed output circuit, or a malfunctioning ECM.

4. Can I drive my Isuzu with the P0654 code?

While driving may still be possible, it is not recommended as this issue could lead to further engine performance problems or unsafe driving conditions.

5. How do I diagnose the P0654 code on an Isuzu?

Diagnosis involves checking the engine speed sensor, inspecting wiring and connectors for damage, and testing the ECM for proper signal output.

6. How do I fix the P0654 code on my Isuzu?

Repairs may include replacing the engine speed sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to fix the P0654 code on an Isuzu?

The cost depends on the cause. Replacing an engine speed sensor might cost $100–$200, while ECM repairs or replacements can be significantly more expensive.

8. Can a bad tachometer cause the P0654 code?

No, a bad tachometer is more likely a symptom rather than the cause. The issue lies in the engine speed output circuit or related components.

9. Will clearing the P0654 code fix the problem on an Isuzu?

Clearing the code will remove it temporarily, but if the underlying issue isn’t resolved, the code and symptoms will likely return.

10. Is a P0654 code specific to Isuzu vehicles?

No, P0654 is a generic OBDII code that can appear on other vehicles, but diagnostic and repair steps may vary depending on the make and model.

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