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B1325 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

B1325 is an OBD-II Code that refers to Control Module Power Circuit Low/High Voltage

Meaning

A B1325 code is a manufacturer specific diagnostic trouble code that is related Chevrolet vehicles and occurs when the vehicle system detects that the voltage on the power circuit for the control module is low or high.

When this happens, the Check Engine Light illuminates and the B1325 code is stored as a fault.

Causes

Common causes for this code include:

  • Faulty Control Module Power
  • Control Module Power harness is open or shorted
  • Control Module Power circuit poor electrical connection

Symptoms

The symptoms of a B1325 code are:

  • Illuminated Check Engine Light
  • All body control functions fail
  • All instruments in the instrument cluster may be deactivated
  • It's possible to get only B1325 codes

Diagnosis

To diagnose a B1325 DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data for failure.
  2. Visually inspect the Control Module Power harness for any damage.
  3. Check the voltage on the power circuit for the control module.
  4. Check the resistance on the power circuit for the control module.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a B1325 code:

  • Not thoroughly inspecting all the wiring and connectors for damage.
  • Not checking the voltage on the power circuit for the control module.
  • Not checking the resistance on the power circuit for the control module.

How serious is this?

A B1325 code is a serious code and should be repaired as soon as possible.

What repairs can fix the code?

Repair manuals

The following are solutions that may fix this problem:

  • Repair or replace any wiring that is damaged
  • Check the voltage on the power circuit for the control module.
  • Check the resistance on the power circuit for the control module.
  • If the issue is with a control module, replace it.

Related codes

A B1325 is related to and may be accompanied by the following codes:

B1321 – Control Module Battery Voltage Low

B1322 – Control Module Battery Voltage High

P0606 – Control Module Processor Fault

U0155 – Lost Communication With ECM/PCM

Conclusion

In conclusion, the B1325 code is a diagnostic trouble code that refers to a problem with the voltage on the power circuit for the control module. There are several possible causes for this code, and the most common ones should be checked first. The symptoms of this code can be wide-ranging and disabling, so it's important to repair it as soon as possible. There are several possible repairs that may fix this problem, so it's best to consult a technician if you're not sure how to proceed.