OBD Guide
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U183B

Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module

U183B is an OBD-II diagnostic trouble code meaning: Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module. Common causes: open or short circuit in the communication circuit between modules, auxiliary pump control module malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Illumination of the fault warning lamp (Check Engine)
  • Gear shifting problems
  • Transmission transition to emergency mode
  • Reduced transmission efficiency
  • Possible jerking when changing gears

Causes

  • Open or short circuit in the communication circuit between modules
  • Auxiliary pump control module malfunction
  • Problems with power supply or grounding of modules
  • Transmission control module (TCM) malfunction
  • Damaged wiring harness or connectors

How to Fix

  1. Check the integrity of the wiring harness and connectors between the modules
  2. Check power and grounding of both modules
  3. Read fault codes from both modules for additional diagnostics
  4. If necessary, replace the faulty module or restore the integrity of the wiring
  5. Check the operation of the auxiliary transmission fluid pump

Related codes

U183AU183CU183D

FAQ

What does the U183B code mean?

U183B is an OBD-II diagnostic trouble code that indicates: Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module

What causes a U183B error code?

The most common causes of U183B include: Open or short circuit in the communication circuit between modules; Auxiliary pump control module malfunction; Problems with power supply or grounding of modules; Transmission control module (TCM) malfunction.

How do I fix a U183B diagnostic trouble code?

To fix U183B: Check the integrity of the wiring harness and connectors between the modules. Check power and grounding of both modules. Read fault codes from both modules for additional diagnostics. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U183B?

Limited driving only, diagnose soon

How much does it cost to fix U183B?

The estimated repair cost for U183B is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat