B1318 Code failures by brands


Description of DTC code B1318

When the engine is started, voltage is supplied from the charging system to the battery and the vehicle's electrical system via the battery's B+ cable. The voltage supplied to the electrical system is used for the correct operation of the various systems, modules, and devices that require it.

Certain control modules have monitoring of the voltage that is sent. If it is detected that the voltage is below or above the calibrated set points after these checks, the fault code B1318 OBDII will be set.

Symptoms of fault code B1318

  • Check Engine light ON.
  • Unstable operation of some automotive electrical systems.

Causes of OBD2 B1318

The Diagnostic code B1318 OBD2 is set for the following reasons:

  • The battery may not have enough charge or maybe in poor condition.
  • The drive belt may not be tight.
  • Alternator cables or connections may be damaged.
  • The alternator may be faulty.
  • The PCM (Powertrain Control Module) may be deficient.

Possible solutions of the DTC code B1318

To troubleshoot DTC B1318 OBDII, follow these steps:

  • Consult the TSB (Technical Service Bulletins).
  • Use a scanner, check if additional DTCs to B1318 are stored. Note that several electrical components are involved in this code, and because of this, it is advisable to diagnose them before replacing them.
  • Check that the battery has the correct voltage, check this value with the one indicated by the manufacturer in the user's manual. Insufficient voltage requires checking the battery and alternator for proper condition. Correct if necessary.
  • Check that the alternator drive belt and the alternator electrical connections are in good condition. Check if the belt is correctly adjusted. If deficiencies are found, make the respective adjustments.


Codes related to B1318

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