P1644 Jeep Code - Incorrect Variant/Configuration
Quick Answer
The Diagnostic Trouble Code (DTC) will set if the Transmission Control Module (TCM) detects that the variables that dictate the vehicle application are not present. 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
- P1644 Jeep indicates Incorrect Variant/Configuration.
- 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 P1644 Jeep Description
What are the Possible Causes of the DTC P1644 Jeep?
- 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 P1644 Jeep?
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 P1644 Jeep 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 P1644 Jeep Code
1. What does the OBDII code P1644 mean on a Jeep?
P1644 indicates "Incorrect Variant/Configuration," which typically means there is a mismatch or incorrect programming in the vehicle’s powertrain control module (PCM) or associated modules.
2. What are the common symptoms of code P1644 in a Jeep?
Symptoms may include the check engine light turning on, poor engine performance, issues with drivability, or failure of other systems like transmission or throttle control.
3. What causes the P1644 code to appear in a Jeep?
The most common causes are incorrect module programming, installation of a mismatched PCM, software corruption, or wiring and communication issues between control modules.
4. Can a faulty PCM cause the P1644 code?
Yes, a faulty or improperly programmed PCM can trigger the P1644 code due to incorrect variant or configuration settings.
5. How can I fix the P1644 code on my Jeep?
Fixing this code may involve reprogramming or updating the PCM, ensuring all modules are correctly configured, or repairing communication and wiring issues.
6. Can a battery disconnect cause the P1644 code?
In some cases, disconnecting the battery can reset module configurations, which may lead to this code if the modules are not properly resynchronized.
7. Is the P1644 code related to a specific Jeep model or engine?
No, this code can appear on various Jeep models if there is a mismatch or incorrect configuration in the control modules.
8. Can I drive my Jeep with the P1644 code active?
While the vehicle may still be drivable, it’s not recommended as improper configurations can lead to reduced performance and potential damage to the engine or transmission.
9. Do I need special tools to diagnose the P1644 code on a Jeep?
Yes, diagnosing this code typically requires an advanced scan tool capable of reading module configurations and performing module reprogramming or updates.
10. Can a weak or failing battery cause the P1644 code on a Jeep?
While uncommon, a weak or failing battery can lead to voltage drops that might corrupt module configurations and result in this code.
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