OBD Guide
ENFRDEESPT

U183C

Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus

U183C is an OBD-II diagnostic trouble code meaning: Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus. Common causes: open or short circuit in wiring harness, auxiliary pump control module malfunction. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • Check Engine light comes on
  • Gear shifting problems
  • Decreased performance
  • Transmission overheating
  • Unusual noises from the transmission

Causes

  • Open or short circuit in wiring harness
  • Auxiliary pump control module malfunction
  • Module power problems
  • Malfunction of the hybrid powertrain control module
  • Problems with the communication bus

How to Fix

  1. Check wiring harness for damage
  2. Check power supply and grounding of the module
  3. Check the operation of the auxiliary pump control module
  4. Check the operation of the hybrid powertrain control module
  5. Check the communication bus for errors

Related codes

U183BU183DU183E

FAQ

What does the U183C code mean?

U183C is an OBD-II diagnostic trouble code that indicates: Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus

What causes a U183C error code?

The most common causes of U183C include: Open or short circuit in wiring harness; Auxiliary pump control module malfunction; Module power problems; Malfunction of the hybrid powertrain control module.

How do I fix a U183C diagnostic trouble code?

To fix U183C: Check wiring harness for damage. Check power supply and grounding of the module. Check the operation of the auxiliary pump control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U183C?

Do not drive — repair immediately

How much does it cost to fix U183C?

The estimated repair cost for U183C is $56–222. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat