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P1625 Cadillac Code - PCM Flash Checksum TCM Conditions

Quick Answer

The P1625 code for Cadillac vehicles refers to a PCM Flash Checksum TCM Conditions error. Common causes include Faulty TCM: A malfunctioning Transmission Control Module can cause errors in the flash checksum, Software Glitch: An issue with the PCM software can lead to incorrect data transmission to the TCM, Wiring Problems: Damaged or loose wiring connections between the PCM and TCM can disrupt data transfer. 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
P1625 Cadillac indicates PCM Flash Checksum TCM Conditions.
Common causes
Common causes include Faulty TCM: A malfunctioning Transmission Control Module can cause errors in the flash checksum, Software Glitch: An issue with the PCM software can lead to incorrect data transmission to the TCM, Wiring Problems: Damaged or loose wiring connections between the PCM and TCM can disrupt data transfer.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1625 Cadillac Description

The P1625 code for Cadillac vehicles refers to a PCM Flash Checksum TCM Conditions error. This code indicates that there is an issue with the Powertrain Control Module (PCM) flash checksum related to the Transmission Control Module (TCM). The PCM is responsible for monitoring and controlling various engine and transmission functions, while the TCM specifically manages the vehicle's transmission system. The flash checksum is a verification value that ensures the integrity of the data stored in the module's memory. When the PCM detects that the checksum for the TCM is incorrect, it triggers the P1625 code.

OBDII Code P1625 Cadillac - PCM Flash Checksum TCM Conditions
P1625 Cadillac Code - PCM Flash Checksum TCM Conditions

Common Causes of P1625 Cadillac

  1. Faulty TCM: A malfunctioning Transmission Control Module can cause errors in the flash checksum.
  2. Software Glitch: An issue with the PCM software can lead to incorrect data transmission to the TCM.
  3. Wiring Problems: Damaged or loose wiring connections between the PCM and TCM can disrupt data transfer.
  4. Module Communication Error: Poor communication between the PCM and TCM can result in checksum discrepancies.
  5. Previous Repairs: Improper repairs or modifications to the transmission system can trigger the P1625 code.

Symptoms of P1625 Cadillac

  1. Check Engine Light: The most common symptom associated with the P1625 code is the illumination of the check engine light on the dashboard.
  2. Transmission Issues: The vehicle may experience problems with shifting, such as harsh or delayed gear changes.
  3. Reduced Fuel Efficiency: Incorrect data in the TCM can lead to poor fuel economy.
  4. Engine Stalling: In severe cases, the vehicle may stall unexpectedly, especially during acceleration or deceleration.
  5. Limited Performance: The vehicle may exhibit reduced power and overall performance due to the transmission control issues.

How to Fix P1625 Cadillac

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the specific error codes and data related to the PCM Flash Checksum TCM Conditions.
  2. Inspect Wiring Connections: Check the wiring harness between the PCM and TCM for any damage or loose connections.
  3. Test TCM Functionality: Verify the functionality of the Transmission Control Module to determine if it needs to be replaced.
  4. Update Software: If a software glitch is identified, update the PCM software to the latest version to resolve the issue.
  5. Clear Error Codes: Once the repair process is completed, clear the error codes and test drive the vehicle to ensure the problem has been resolved.

Cost to Fix P1625 Cadillac

The cost of repairing the P1625 code for Cadillac vehicles can vary depending on the specific cause of the issue. On average, the repair costs can range from $200 to $600, including parts and labor. However, it is essential to consider that diagnostic time and labor rates at auto repair shops may vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops typically charge between $80 and $150 per hour for labor. Rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more affordable prices. It is advisable to consult with a professional mechanic to get a more accurate estimate based on your vehicle's specific requirements.

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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 P1625 Cadillac Code

1. What does the OBDII code P1625 mean on a Cadillac?

P1625 indicates a "PCM Flash Checksum TCM Conditions" error, meaning the Powertrain Control Module (PCM) has detected a checksum mismatch or corruption in its programming related to communication with the Transmission Control Module (TCM).

2. What are the common symptoms of code P1625 on a Cadillac?

Common symptoms include a Check Engine Light, poor transmission performance, erratic shifting, reduced engine power, or the vehicle entering "limp mode."

3. What causes the P1625 code to appear?

The primary causes include corrupted PCM or TCM software, a failed PCM reprogramming attempt, damaged wiring or connectors, or an internal failure in the PCM or TCM.

4. Can I drive my Cadillac with a P1625 code?

Driving with a P1625 code is possible but not recommended, as it may result in reduced performance or transmission issues that could lead to further damage.

5. How is the P1625 code diagnosed?

A technician will use a scan tool to verify the code, check for related codes, inspect PCM and TCM software integrity, and examine wiring and connections for damage.

6. Can a software update fix the P1625 code on a Cadillac?

Yes, in some cases, reflashing or updating the PCM or TCM software to the latest version can resolve the issue.

7. What tools are needed to fix the P1625 code?

Tools typically include an OBDII scan tool, a programming device for PCM/TCM updates, and a multimeter for checking wiring and connections.

8. How much does it cost to repair a P1625 code?

Repair costs can vary widely, ranging from $100–$300 for software updates to $1,000 or more if the PCM or TCM needs to be replaced.

9. Can a weak battery cause the P1625 code?

Yes, a weak or failing battery can cause voltage drops that may corrupt PCM or TCM programming, leading to the P1625 code.

10. What should I do if the P1625 code returns after repairs?

If the code persists, have the PCM and TCM thoroughly tested for internal faults, and ensure all software updates were properly applied.

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