AutoCodes – GMC – P1602 GMC

P1602 GMC Code - Knock Sensor Module Performance Conditions

Quick Answer

With the engine running and Engine Coolant Temperature (ECT) sensor input more than 104°F, the Powertrain Control Module (PCM) detects a fault in the internal Knock Sensor module or its circuit Common causes include Faulty Knock Sensor Module, Knock Sensor Module harness is open or shorted, Knock Sensor Module circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1602 GMC indicates Knock Sensor Module Performance Conditions.
Common causes: Common causes include Faulty Knock Sensor Module, Knock Sensor Module harness is open or shorted, Knock Sensor Module circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 4,791

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1602 GMC Description

With the engine running and Engine Coolant Temperature (ECT) sensor input more than 104°F, the Powertrain Control Module (PCM) detects a fault in the internal Knock Sensor module or its circuit

OBDII Code P1602 GMC - Knock Sensor Module Performance Conditions - AutoCodes.com — P1602 GMC Code - Knock Sensor Module Performance Conditions

What does this mean?

What are the Possible Causes of the DTC P1602 GMC?

Faulty Knock Sensor Module
Knock Sensor Module harness is open or shorted
Knock Sensor Module circuit poor electrical connection

How to Fix the DTC P1602 GMC?

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 P1602 GMC 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 P1602 GMC code?

Need more information on how to fix the P1602 GMC code? Get Access to Factory Service Manuals

Need Help with the 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 P1602 GMC Code

1. What are the common symptoms of OBDII code P1602 GMC (Knock Sensor Module Performance Conditions)?

- Common symptoms include engine knocking or pinging noises, reduced fuel efficiency, and a decrease in engine performance.

2. What are the possible causes of OBDII code P1602 GMC?

- The code P1602 GMC is typically triggered by issues with the knock sensor module, such as faulty wiring, a defective sensor, or a loose connection.

3. How can I diagnose the cause of OBDII code P1602 GMC?

- To diagnose the issue, you can use an OBDII scanner to read the trouble codes, visually inspect the knock sensor module and its wiring, and perform tests to check the sensor's functionality.

4. Can I still drive my vehicle with OBDII code P1602 GMC?

- It is not recommended to drive your vehicle with the code P1602 GMC as it can lead to engine damage and reduced performance. It is best to address the issue promptly.

5. How can I repair OBDII code P1602 GMC?

- Repairing the code P1602 GMC involves identifying and fixing the underlying issue with the knock sensor module, which may require replacing the sensor, repairing wiring, or securing loose connections.

6. Will resetting the OBDII code P1602 GMC make it go away permanently?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue with the knock sensor module is not addressed, the code is likely to return.

7. Is it possible to prevent OBDII code P1602 GMC from occurring?

- Regular maintenance, such as checking the condition of the knock sensor module, ensuring proper wiring connections, and addressing any issues promptly, can help prevent code P1602 GMC.

8. Can a DIY enthusiast fix OBDII code P1602 GMC at home?

- Depending on your mechanical skills and knowledge, you may be able to address the issue at home by following repair guides and using the necessary tools. However, if unsure, it's best to consult a professional mechanic.

9. How much does it cost to repair OBDII code P1602 GMC at a mechanic?

- The cost of repairing OBDII code P1602 GMC can vary depending on the root cause of the issue, the labor rates of the mechanic, and the cost of parts. It's advisable to get a diagnosis and quote from a mechanic.

10. Can OBDII code P1602 GMC cause long-term damage to my vehicle if left unresolved?

- Yes, leaving OBDII code P1602 GMC unresolved can potentially lead to long-term engine damage, reduced performance, and increased fuel consumption. It's important to address the issue promptly.