B1638 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

B1638 Code failures by brands

B1638 CHRYSLER, DODGE, JEEP, RAM: RIGHT HIGH BEAM CONTROL CIRCUIT HIGH

Description of DTC code B1638

The Fully Integrated Power Module (TIPM) works as a smart fuse box, which controls a big part of the car’s electrical system. Basically, this module takes the commands sent by other controllers and switches and sends them in a voltage signal as required.

Generally, the TIPM is installed in the engine compartment close to the battery. It connects directly to the B+ cable via a bolt-on top of the module. It also receives a ground signal through several electrical connectors. There is a variety of internal relays inside this controller, a microprocessor, and fuses that execute commands sent by the FCM.

The DTC B1638 OBD2 for some brands (Chrysler, Dodge, Jeep, RAM) is related to a problem with the right high beam. This is set when the fully integrated Power Module in that circuit has voltages that exceed the allowable threshold.

Symptoms of fault code B1638

Causes of OBD2 B1638

OBDII diagnostic code B1638 is set for the following reasons:

  • The right high beam bulb circuit wiring or connectors may have damage.
  • The right high beam circuit may have deficiencies causing the high voltage.
  • The right high beam bulb may be defective.
  • The Totally Integrated Power Module may be damaged.

Possible solutions of the DTC code B1638

To troubleshoot the B1638 OBD2 fault code, try this:

  • Check the TSBs.
  • Check the condition of the connectors and wires related to the right high beam circuit. Look for damage caused by corrosion or burns and if you detect such conditions, proceed with the appropriate corrections.
  • Using the appropriate tools, verify the proper operation of the right high beam circuit. Check the right high beam circuit connections for damage due to high levels of corrosion or poor connections. Repair as required.
  • Verify that the right high beam bulb is not in poor condition. If you discover damage to the bulb, replace it.

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