P1625 Cadillac Code - PCM Flash Checksum TCM Conditions
Quick Answer
P1625 Cadillac indicates PCM Flash Checksum TCM Conditions. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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
- P1625 Cadillac indicates PCM Flash Checksum TCM Conditions.
- Common causes
- Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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.
Code P1625 Cadillac Description
What are the Possible Causes of the DTC P1625 Cadillac?
- Faulty Transmission Control Module (TCM)
- Transmission Control Module (TCM) harness is open or shorted
- Transmission Control Module (TCM) circuit poor electrical connection
How to Fix the DTC P1625 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 P1625 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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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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