AutoCodes – Cadillac – P0602 Cadillac

P0602 Cadillac Code - Control Module Not Programmed

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). Common causes include Low battery voltage, Reprogram Engine Control Module (ECM), Faulty Engine Control Module. 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: P0602 Cadillac indicates Control Module Not Programmed.
Common causes: Common causes include Low battery voltage, Reprogram Engine Control Module (ECM), Faulty Engine Control Module.
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 6,946

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 Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0602 Cadillac Description

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). This diagnostic also addresses if the ECM is not programmed. The ECM monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved. The Diagnostic Trouble Code (DTC) will be set when the ECM detects an internal failure or incomplete programming for more than 10 s.

OBDII Code P0602 Cadillac - Control Module Not Programmed - AutoCodes.com — P0602 Cadillac Code - Control Module Not Programmed

What does this mean?

What are the Possible Causes of the DTC P0602 Cadillac?

Low battery voltage
Reprogram Engine Control Module (ECM)
Faulty Engine Control Module
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P0602 Cadillac?

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 P0602 Cadillac 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.

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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 P0602 Cadillac Code

1. What does the OBDII code P0602 mean on a Cadillac?

P0602 indicates that the control module, typically the Powertrain Control Module (PCM), has not been properly programmed or is missing necessary calibration data.

2. What are the common symptoms of code P0602 in a Cadillac?

Symptoms may include poor engine performance, the check engine light illuminated, issues with shifting (in automatic transmissions), or the vehicle failing to start.

3. What causes the P0602 code in a Cadillac?

This code is usually triggered by an unprogrammed or incorrectly programmed PCM, a failed software update, or an incompatible replacement PCM.

4. Can a P0602 code damage my Cadillac if left unresolved?

While it may not cause immediate damage, an unprogrammed or poorly calibrated PCM can lead to poor performance and long-term wear on components.

5. How can I fix the P0602 code on my Cadillac?

Fixing this code typically involves reprogramming the PCM using manufacturer-specific software and tools, or replacing and programming a new PCM if the current one is faulty.

6. Do I need to replace the PCM to resolve the P0602 code?

Not always. Often, the PCM can be reprogrammed or updated rather than replaced, unless it is physically damaged or defective.

7. Can I drive my Cadillac with a P0602 code?

It’s not recommended to drive the vehicle extensively with this code active, as the engine and transmission may not operate correctly, potentially leading to unsafe conditions.

8. Do I need special tools to fix the P0602 code?

Yes, programming or reprogramming the PCM requires specialized diagnostic tools and software, usually only available to dealerships or qualified repair shops.

9. How much does it cost to fix the P0602 code on a Cadillac?

Reprogramming the PCM may cost $100–$250, while replacing and programming a new PCM could range from $500 to $1,500, depending on the model and labor rates.

10. Can a dead battery cause the P0602 code in a Cadillac?

A dead or extremely weak battery can occasionally cause the PCM to lose its programming, potentially triggering the P0602 code.