P1644 Mercedes-Benz Code - Transmission Control Module Supply Voltage Low
Quick Answer
P1644 Mercedes-Benz indicates Transmission Control Module Supply Voltage Low. 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 Mercedes-Benz indicates Transmission Control Module Supply Voltage Low.
- 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 Mercedes-Benz Description
What are the Possible Causes of the DTC P1644 Mercedes-Benz?
- 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 Mercedes-Benz?
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 Mercedes-Benz 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 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P1644 in a Mercedes-Benz related to the Transmission Control Module (TCM) supply voltage being low?
The common symptoms include rough shifting, transmission slipping, poor acceleration, and potential stalling of the vehicle.
2. What are some possible causes of OBDII code P1644 related to the low supply voltage to the TCM in a Mercedes-Benz?
The causes can include corroded or loose battery connections, a faulty alternator, a weak battery, damaged wiring, or a failing TCM.
3. How can I diagnose the OBDII code P1644 in a Mercedes-Benz with the Transmission Control Module supply voltage being low?
You can start by checking the battery voltage with a multimeter, inspecting the battery terminals for corrosion or looseness, and visually inspecting the wiring leading to the TCM for any damage.
4. Can a DIY enthusiast repair OBDII code P1644 in a Mercedes-Benz related to the TCM supply voltage being low?
DIY enthusiasts can attempt to address this issue by ensuring the battery connections are tight and corrosion-free, checking the alternator's output, and inspecting the wiring for any visible damage. However, complex issues may require professional diagnosis and repair.
5. Is it safe to continue driving a Mercedes-Benz with the OBDII code P1644 indicating low supply voltage to the TCM?
It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission system. It is best to address the issue promptly to avoid potential costly repairs.
6. How much does it typically cost to repair OBDII code P1644 in a Mercedes-Benz caused by low supply voltage to the TCM?
The cost of repairs can vary depending on the exact cause of the issue. Simple fixes such as tightening battery connections may be relatively inexpensive, while replacing a faulty TCM or alternator can be more costly.
7. Can a low battery be the sole reason behind OBDII code P1644 in a Mercedes-Benz?
While a low battery or alternator issue can contribute to the TCM supply voltage being low, there may also be other underlying factors such as wiring damage or a failing TCM that need to be addressed.
8. What are the long-term implications of ignoring OBDII code P1644 related to low supply voltage to the TCM in a Mercedes-Benz?
Ignoring this code can result in damage to the transmission system, leading to more severe issues and potentially costly repairs down the line. It is crucial to address the problem promptly.
9. Are there any preventive measures to avoid encountering OBDII code P1644 in a Mercedes-Benz due to low TCM supply voltage?
Regularly checking and maintaining the battery, alternator, and wiring connections can help prevent issues related to low supply voltage to the TCM. It is also advisable to address any electrical issues promptly to avoid further complications.
10. Can extreme weather conditions affect the likelihood of experiencing OBDII code P1644 in a Mercedes-Benz related to low supply voltage to the TCM?
Extreme temperatures can potentially impact the performance of the battery and alternator, which may lead to issues with low supply voltage to the TCM. Ensuring the electrical components are well-maintained can help mitigate the effects of extreme weather conditions.
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