U1839
Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine Control Module
U1839 is an OBD-II diagnostic trouble code meaning: Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine Control Module. Common causes: open circuit of communication between modules, damaged connectors or corroded contacts. Estimated repair cost: $56–278.
Symptoms
- Check Engine Light Is On
- Gear shifting problems
- Transmission transition to emergency mode
- Reduced transmission efficiency
- Possible jerks when switching
Causes
- Open circuit of communication between modules
- Damaged connectors or corroded contacts
- Pump control module malfunction
- Problems with the engine ECU
- Short circuit in wiring harness
How to Fix
- Check the integrity of the wiring between the modules
- Inspect and clean all electrical connectors
- Check the power supply and ground of the pump module
- Scan the pump module for additional fault codes
- Replacing the pump control module if necessary
Related codes
FAQ
What does the U1839 code mean?
U1839 is an OBD-II diagnostic trouble code that indicates: Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine Control Module
What causes a U1839 error code?
The most common causes of U1839 include: Open circuit of communication between modules; Damaged connectors or corroded contacts; Pump control module malfunction; Problems with the engine ECU.
How do I fix a U1839 diagnostic trouble code?
To fix U1839: Check the integrity of the wiring between the modules. Inspect and clean all electrical connectors. Check the power supply and ground of the pump module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1839?
Yes, but get it checked soon
How much does it cost to fix U1839?
The estimated repair cost for U1839 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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